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linux-yocto/kernel/sched/sched.h
Tejun Heo f0e1a0643a sched_ext: Implement BPF extensible scheduler class 
Implement a new scheduler class sched_ext (SCX), which allows scheduling
policies to be implemented as BPF programs to achieve the following:

1. Ease of experimentation and exploration: Enabling rapid iteration of new
   scheduling policies.

2. Customization: Building application-specific schedulers which implement
   policies that are not applicable to general-purpose schedulers.

3. Rapid scheduler deployments: Non-disruptive swap outs of scheduling
   policies in production environments.

sched_ext leverages BPF’s struct_ops feature to define a structure which
exports function callbacks and flags to BPF programs that wish to implement
scheduling policies. The struct_ops structure exported by sched_ext is
struct sched_ext_ops, and is conceptually similar to struct sched_class. The
role of sched_ext is to map the complex sched_class callbacks to the more
simple and ergonomic struct sched_ext_ops callbacks.

For more detailed discussion on the motivations and overview, please refer
to the cover letter.

Later patches will also add several example schedulers and documentation.

This patch implements the minimum core framework to enable implementation of
BPF schedulers. Subsequent patches will gradually add functionalities
including safety guarantee mechanisms, nohz and cgroup support.

include/linux/sched/ext.h defines struct sched_ext_ops. With the comment on
top, each operation should be self-explanatory. The followings are worth
noting:

- Both "sched_ext" and its shorthand "scx" are used. If the identifier
  already has "sched" in it, "ext" is used; otherwise, "scx".

- In sched_ext_ops, only .name is mandatory. Every operation is optional and
  if omitted a simple but functional default behavior is provided.

- A new policy constant SCHED_EXT is added and a task can select sched_ext
  by invoking sched_setscheduler(2) with the new policy constant. However,
  if the BPF scheduler is not loaded, SCHED_EXT is the same as SCHED_NORMAL
  and the task is scheduled by CFS. When the BPF scheduler is loaded, all
  tasks which have the SCHED_EXT policy are switched to sched_ext.

- To bridge the workflow imbalance between the scheduler core and
  sched_ext_ops callbacks, sched_ext uses simple FIFOs called dispatch
  queues (dsq's). By default, there is one global dsq (SCX_DSQ_GLOBAL), and
  one local per-CPU dsq (SCX_DSQ_LOCAL). SCX_DSQ_GLOBAL is provided for
  convenience and need not be used by a scheduler that doesn't require it.
  SCX_DSQ_LOCAL is the per-CPU FIFO that sched_ext pulls from when putting
  the next task on the CPU. The BPF scheduler can manage an arbitrary number
  of dsq's using scx_bpf_create_dsq() and scx_bpf_destroy_dsq().

- sched_ext guarantees system integrity no matter what the BPF scheduler
  does. To enable this, each task's ownership is tracked through
  p->scx.ops_state and all tasks are put on scx_tasks list. The disable path
  can always recover and revert all tasks back to CFS. See p->scx.ops_state
  and scx_tasks.

- A task is not tied to its rq while enqueued. This decouples CPU selection
  from queueing and allows sharing a scheduling queue across an arbitrary
  subset of CPUs. This adds some complexities as a task may need to be
  bounced between rq's right before it starts executing. See
  dispatch_to_local_dsq() and move_task_to_local_dsq().

- One complication that arises from the above weak association between task
  and rq is that synchronizing with dequeue() gets complicated as dequeue()
  may happen anytime while the task is enqueued and the dispatch path might
  need to release the rq lock to transfer the task. Solving this requires a
  bit of complexity. See the logic around p->scx.sticky_cpu and
  p->scx.ops_qseq.

- Both enable and disable paths are a bit complicated. The enable path
  switches all tasks without blocking to avoid issues which can arise from
  partially switched states (e.g. the switching task itself being starved).
  The disable path can't trust the BPF scheduler at all, so it also has to
  guarantee forward progress without blocking. See scx_ops_enable() and
  scx_ops_disable_workfn().

- When sched_ext is disabled, static_branches are used to shut down the
  entry points from hot paths.

v7: - scx_ops_bypass() was incorrectly and unnecessarily trying to grab
      scx_ops_enable_mutex which can lead to deadlocks in the disable path.
      Fixed.

    - Fixed TASK_DEAD handling bug in scx_ops_enable() path which could lead
      to use-after-free.

    - Consolidated per-cpu variable usages and other cleanups.

v6: - SCX_NR_ONLINE_OPS replaced with SCX_OPI_*_BEGIN/END so that multiple
      groups can be expressed. Later CPU hotplug operations are put into
      their own group.

    - SCX_OPS_DISABLING state is replaced with the new bypass mechanism
      which allows temporarily putting the system into simple FIFO
      scheduling mode bypassing the BPF scheduler. In addition to the shut
      down path, this will also be used to isolate the BPF scheduler across
      PM events. Enabling and disabling the bypass mode requires iterating
      all runnable tasks. rq->scx.runnable_list addition is moved from the
      later watchdog patch.

    - ops.prep_enable() is replaced with ops.init_task() and
      ops.enable/disable() are now called whenever the task enters and
      leaves sched_ext instead of when the task becomes schedulable on
      sched_ext and stops being so. A new operation - ops.exit_task() - is
      called when the task stops being schedulable on sched_ext.

    - scx_bpf_dispatch() can now be called from ops.select_cpu() too. This
      removes the need for communicating local dispatch decision made by
      ops.select_cpu() to ops.enqueue() via per-task storage.
      SCX_KF_SELECT_CPU is added to support the change.

    - SCX_TASK_ENQ_LOCAL which told the BPF scheudler that
      scx_select_cpu_dfl() wants the task to be dispatched to the local DSQ
      was removed. Instead, scx_bpf_select_cpu_dfl() now dispatches directly
      if it finds a suitable idle CPU. If such behavior is not desired,
      users can use scx_bpf_select_cpu_dfl() which returns the verdict in a
      bool out param.

    - scx_select_cpu_dfl() was mishandling WAKE_SYNC and could end up
      queueing many tasks on a local DSQ which makes tasks to execute in
      order while other CPUs stay idle which made some hackbench numbers
      really bad. Fixed.

    - The current state of sched_ext can now be monitored through files
      under /sys/sched_ext instead of /sys/kernel/debug/sched/ext. This is
      to enable monitoring on kernels which don't enable debugfs.

    - sched_ext wasn't telling BPF that ops.dispatch()'s @prev argument may
      be NULL and a BPF scheduler which derefs the pointer without checking
      could crash the kernel. Tell BPF. This is currently a bit ugly. A
      better way to annotate this is expected in the future.

    - scx_exit_info updated to carry pointers to message buffers instead of
      embedding them directly. This decouples buffer sizes from API so that
      they can be changed without breaking compatibility.

    - exit_code added to scx_exit_info. This is used to indicate different
      exit conditions on non-error exits and will be used to handle e.g. CPU
      hotplugs.

    - The patch "sched_ext: Allow BPF schedulers to switch all eligible
      tasks into sched_ext" is folded in and the interface is changed so
      that partial switching is indicated with a new ops flag
      %SCX_OPS_SWITCH_PARTIAL. This makes scx_bpf_switch_all() unnecessasry
      and in turn SCX_KF_INIT. ops.init() is now called with
      SCX_KF_SLEEPABLE.

    - Code reorganized so that only the parts necessary to integrate with
      the rest of the kernel are in the header files.

    - Changes to reflect the BPF and other kernel changes including the
      addition of bpf_sched_ext_ops.cfi_stubs.

v5: - To accommodate 32bit configs, p->scx.ops_state is now atomic_long_t
      instead of atomic64_t and scx_dsp_buf_ent.qseq which uses
      load_acquire/store_release is now unsigned long instead of u64.

    - Fix the bug where bpf_scx_btf_struct_access() was allowing write
      access to arbitrary fields.

    - Distinguish kfuncs which can be called from any sched_ext ops and from
      anywhere. e.g. scx_bpf_pick_idle_cpu() can now be called only from
      sched_ext ops.

    - Rename "type" to "kind" in scx_exit_info to make it easier to use on
      languages in which "type" is a reserved keyword.

    - Since cff9b2332a ("kernel/sched: Modify initial boot task idle
      setup"), PF_IDLE is not set on idle tasks which haven't been online
      yet which made scx_task_iter_next_filtered() include those idle tasks
      in iterations leading to oopses. Update scx_task_iter_next_filtered()
      to directly test p->sched_class against idle_sched_class instead of
      using is_idle_task() which tests PF_IDLE.

    - Other updates to match upstream changes such as adding const to
      set_cpumask() param and renaming check_preempt_curr() to
      wakeup_preempt().

v4: - SCHED_CHANGE_BLOCK replaced with the previous
      sched_deq_and_put_task()/sched_enq_and_set_tsak() pair. This is
      because upstream is adaopting a different generic cleanup mechanism.
      Once that lands, the code will be adapted accordingly.

    - task_on_scx() used to test whether a task should be switched into SCX,
      which is confusing. Renamed to task_should_scx(). task_on_scx() now
      tests whether a task is currently on SCX.

    - scx_has_idle_cpus is barely used anymore and replaced with direct
      check on the idle cpumask.

    - SCX_PICK_IDLE_CORE added and scx_pick_idle_cpu() improved to prefer
      fully idle cores.

    - ops.enable() now sees up-to-date p->scx.weight value.

    - ttwu_queue path is disabled for tasks on SCX to avoid confusing BPF
      schedulers expecting ->select_cpu() call.

    - Use cpu_smt_mask() instead of topology_sibling_cpumask() like the rest
      of the scheduler.

v3: - ops.set_weight() added to allow BPF schedulers to track weight changes
      without polling p->scx.weight.

    - move_task_to_local_dsq() was losing SCX-specific enq_flags when
      enqueueing the task on the target dsq because it goes through
      activate_task() which loses the upper 32bit of the flags. Carry the
      flags through rq->scx.extra_enq_flags.

    - scx_bpf_dispatch(), scx_bpf_pick_idle_cpu(), scx_bpf_task_running()
      and scx_bpf_task_cpu() now use the new KF_RCU instead of
      KF_TRUSTED_ARGS to make it easier for BPF schedulers to call them.

    - The kfunc helper access control mechanism implemented through
      sched_ext_entity.kf_mask is improved. Now SCX_CALL_OP*() is always
      used when invoking scx_ops operations.

v2: - balance_scx_on_up() is dropped. Instead, on UP, balance_scx() is
      called from put_prev_taks_scx() and pick_next_task_scx() as necessary.
      To determine whether balance_scx() should be called from
      put_prev_task_scx(), SCX_TASK_DEQD_FOR_SLEEP flag is added. See the
      comment in put_prev_task_scx() for details.

    - sched_deq_and_put_task() / sched_enq_and_set_task() sequences replaced
      with SCHED_CHANGE_BLOCK().

    - Unused all_dsqs list removed. This was a left-over from previous
      iterations.

    - p->scx.kf_mask is added to track and enforce which kfunc helpers are
      allowed. Also, init/exit sequences are updated to make some kfuncs
      always safe to call regardless of the current BPF scheduler state.
      Combined, this should make all the kfuncs safe.

    - BPF now supports sleepable struct_ops operations. Hacky workaround
      removed and operations and kfunc helpers are tagged appropriately.

    - BPF now supports bitmask / cpumask helpers. scx_bpf_get_idle_cpumask()
      and friends are added so that BPF schedulers can use the idle masks
      with the generic helpers. This replaces the hacky kfunc helpers added
      by a separate patch in V1.

    - CONFIG_SCHED_CLASS_EXT can no longer be enabled if SCHED_CORE is
      enabled. This restriction will be removed by a later patch which adds
      core-sched support.

    - Add MAINTAINERS entries and other misc changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Co-authored-by: David Vernet <dvernet@meta.com>
Acked-by: Josh Don <joshdon@google.com>
Acked-by: Hao Luo <haoluo@google.com>
Acked-by: Barret Rhoden <brho@google.com>
Cc: Andrea Righi <andrea.righi@canonical.com>
2024-06-18 10:09:17 -10:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Scheduler internal types and methods:
*/
#ifndef _KERNEL_SCHED_SCHED_H
#define _KERNEL_SCHED_SCHED_H
#include <linux/sched/affinity.h>
#include <linux/sched/autogroup.h>
#include <linux/sched/cpufreq.h>
#include <linux/sched/deadline.h>
#include <linux/sched.h>
#include <linux/sched/loadavg.h>
#include <linux/sched/mm.h>
#include <linux/sched/rseq_api.h>
#include <linux/sched/signal.h>
#include <linux/sched/smt.h>
#include <linux/sched/stat.h>
#include <linux/sched/sysctl.h>
#include <linux/sched/task_flags.h>
#include <linux/sched/task.h>
#include <linux/sched/topology.h>
#include <linux/atomic.h>
#include <linux/bitmap.h>
#include <linux/bug.h>
#include <linux/capability.h>
#include <linux/cgroup_api.h>
#include <linux/cgroup.h>
#include <linux/context_tracking.h>
#include <linux/cpufreq.h>
#include <linux/cpumask_api.h>
#include <linux/ctype.h>
#include <linux/file.h>
#include <linux/fs_api.h>
#include <linux/hrtimer_api.h>
#include <linux/interrupt.h>
#include <linux/irq_work.h>
#include <linux/jiffies.h>
#include <linux/kref_api.h>
#include <linux/kthread.h>
#include <linux/ktime_api.h>
#include <linux/lockdep_api.h>
#include <linux/lockdep.h>
#include <linux/minmax.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mutex_api.h>
#include <linux/plist.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/profile.h>
#include <linux/psi.h>
#include <linux/rcupdate.h>
#include <linux/seq_file.h>
#include <linux/seqlock.h>
#include <linux/softirq.h>
#include <linux/spinlock_api.h>
#include <linux/static_key.h>
#include <linux/stop_machine.h>
#include <linux/syscalls_api.h>
#include <linux/syscalls.h>
#include <linux/tick.h>
#include <linux/topology.h>
#include <linux/types.h>
#include <linux/u64_stats_sync_api.h>
#include <linux/uaccess.h>
#include <linux/wait_api.h>
#include <linux/wait_bit.h>
#include <linux/workqueue_api.h>
#include <trace/events/power.h>
#include <trace/events/sched.h>
#include "../workqueue_internal.h"
struct rq;
struct cfs_rq;
struct rt_rq;
struct sched_group;
struct cpuidle_state;
#ifdef CONFIG_PARAVIRT
# include <asm/paravirt.h>
# include <asm/paravirt_api_clock.h>
#endif
#include <asm/barrier.h>
#include "cpupri.h"
#include "cpudeadline.h"
#ifdef CONFIG_SCHED_DEBUG
# define SCHED_WARN_ON(x) WARN_ONCE(x, #x)
#else
# define SCHED_WARN_ON(x) ({ (void)(x), 0; })
#endif
/* task_struct::on_rq states: */
#define TASK_ON_RQ_QUEUED 1
#define TASK_ON_RQ_MIGRATING 2
extern __read_mostly int scheduler_running;
extern unsigned long calc_load_update;
extern atomic_long_t calc_load_tasks;
extern void calc_global_load_tick(struct rq *this_rq);
extern long calc_load_fold_active(struct rq *this_rq, long adjust);
extern void call_trace_sched_update_nr_running(struct rq *rq, int count);
extern int sysctl_sched_rt_period;
extern int sysctl_sched_rt_runtime;
extern int sched_rr_timeslice;
/*
* Asymmetric CPU capacity bits
*/
struct asym_cap_data {
struct list_head link;
struct rcu_head rcu;
unsigned long capacity;
unsigned long cpus[];
};
extern struct list_head asym_cap_list;
#define cpu_capacity_span(asym_data) to_cpumask((asym_data)->cpus)
/*
* Helpers for converting nanosecond timing to jiffy resolution
*/
#define NS_TO_JIFFIES(time) ((unsigned long)(time) / (NSEC_PER_SEC/HZ))
/*
* Increase resolution of nice-level calculations for 64-bit architectures.
* The extra resolution improves shares distribution and load balancing of
* low-weight task groups (eg. nice +19 on an autogroup), deeper task-group
* hierarchies, especially on larger systems. This is not a user-visible change
* and does not change the user-interface for setting shares/weights.
*
* We increase resolution only if we have enough bits to allow this increased
* resolution (i.e. 64-bit). The costs for increasing resolution when 32-bit
* are pretty high and the returns do not justify the increased costs.
*
* Really only required when CONFIG_FAIR_GROUP_SCHED=y is also set, but to
* increase coverage and consistency always enable it on 64-bit platforms.
*/
#ifdef CONFIG_64BIT
# define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT)
# define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT)
# define scale_load_down(w) \
({ \
unsigned long __w = (w); \
\
if (__w) \
__w = max(2UL, __w >> SCHED_FIXEDPOINT_SHIFT); \
__w; \
})
#else
# define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT)
# define scale_load(w) (w)
# define scale_load_down(w) (w)
#endif
/*
* Task weight (visible to users) and its load (invisible to users) have
* independent resolution, but they should be well calibrated. We use
* scale_load() and scale_load_down(w) to convert between them. The
* following must be true:
*
* scale_load(sched_prio_to_weight[NICE_TO_PRIO(0)-MAX_RT_PRIO]) == NICE_0_LOAD
*
*/
#define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT)
/*
* Single value that decides SCHED_DEADLINE internal math precision.
* 10 -> just above 1us
* 9 -> just above 0.5us
*/
#define DL_SCALE 10
/*
* Single value that denotes runtime == period, ie unlimited time.
*/
#define RUNTIME_INF ((u64)~0ULL)
static inline int idle_policy(int policy)
{
return policy == SCHED_IDLE;
}
static inline int normal_policy(int policy)
{
#ifdef CONFIG_SCHED_CLASS_EXT
if (policy == SCHED_EXT)
return true;
#endif
return policy == SCHED_NORMAL;
}
static inline int fair_policy(int policy)
{
return normal_policy(policy) || policy == SCHED_BATCH;
}
static inline int rt_policy(int policy)
{
return policy == SCHED_FIFO || policy == SCHED_RR;
}
static inline int dl_policy(int policy)
{
return policy == SCHED_DEADLINE;
}
static inline bool valid_policy(int policy)
{
return idle_policy(policy) || fair_policy(policy) ||
rt_policy(policy) || dl_policy(policy);
}
static inline int task_has_idle_policy(struct task_struct *p)
{
return idle_policy(p->policy);
}
static inline int task_has_rt_policy(struct task_struct *p)
{
return rt_policy(p->policy);
}
static inline int task_has_dl_policy(struct task_struct *p)
{
return dl_policy(p->policy);
}
#define cap_scale(v, s) ((v)*(s) >> SCHED_CAPACITY_SHIFT)
static inline void update_avg(u64 *avg, u64 sample)
{
s64 diff = sample - *avg;
*avg += diff / 8;
}
/*
* Shifting a value by an exponent greater *or equal* to the size of said value
* is UB; cap at size-1.
*/
#define shr_bound(val, shift) \
(val >> min_t(typeof(shift), shift, BITS_PER_TYPE(typeof(val)) - 1))
/*
* cgroup weight knobs should use the common MIN, DFL and MAX values which are
* 1, 100 and 10000 respectively. While it loses a bit of range on both ends, it
* maps pretty well onto the shares value used by scheduler and the round-trip
* conversions preserve the original value over the entire range.
*/
static inline unsigned long sched_weight_from_cgroup(unsigned long cgrp_weight)
{
return DIV_ROUND_CLOSEST_ULL(cgrp_weight * 1024, CGROUP_WEIGHT_DFL);
}
static inline unsigned long sched_weight_to_cgroup(unsigned long weight)
{
return clamp_t(unsigned long,
DIV_ROUND_CLOSEST_ULL(weight * CGROUP_WEIGHT_DFL, 1024),
CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
}
/*
* !! For sched_setattr_nocheck() (kernel) only !!
*
* This is actually gross. :(
*
* It is used to make schedutil kworker(s) higher priority than SCHED_DEADLINE
* tasks, but still be able to sleep. We need this on platforms that cannot
* atomically change clock frequency. Remove once fast switching will be
* available on such platforms.
*
* SUGOV stands for SchedUtil GOVernor.
*/
#define SCHED_FLAG_SUGOV 0x10000000
#define SCHED_DL_FLAGS (SCHED_FLAG_RECLAIM | SCHED_FLAG_DL_OVERRUN | SCHED_FLAG_SUGOV)
static inline bool dl_entity_is_special(const struct sched_dl_entity *dl_se)
{
#ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL
return unlikely(dl_se->flags & SCHED_FLAG_SUGOV);
#else
return false;
#endif
}
/*
* Tells if entity @a should preempt entity @b.
*/
static inline bool dl_entity_preempt(const struct sched_dl_entity *a,
const struct sched_dl_entity *b)
{
return dl_entity_is_special(a) ||
dl_time_before(a->deadline, b->deadline);
}
/*
* This is the priority-queue data structure of the RT scheduling class:
*/
struct rt_prio_array {
DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */
struct list_head queue[MAX_RT_PRIO];
};
struct rt_bandwidth {
/* nests inside the rq lock: */
raw_spinlock_t rt_runtime_lock;
ktime_t rt_period;
u64 rt_runtime;
struct hrtimer rt_period_timer;
unsigned int rt_period_active;
};
static inline int dl_bandwidth_enabled(void)
{
return sysctl_sched_rt_runtime >= 0;
}
/*
* To keep the bandwidth of -deadline tasks under control
* we need some place where:
* - store the maximum -deadline bandwidth of each cpu;
* - cache the fraction of bandwidth that is currently allocated in
* each root domain;
*
* This is all done in the data structure below. It is similar to the
* one used for RT-throttling (rt_bandwidth), with the main difference
* that, since here we are only interested in admission control, we
* do not decrease any runtime while the group "executes", neither we
* need a timer to replenish it.
*
* With respect to SMP, bandwidth is given on a per root domain basis,
* meaning that:
* - bw (< 100%) is the deadline bandwidth of each CPU;
* - total_bw is the currently allocated bandwidth in each root domain;
*/
struct dl_bw {
raw_spinlock_t lock;
u64 bw;
u64 total_bw;
};
extern void init_dl_bw(struct dl_bw *dl_b);
extern int sched_dl_global_validate(void);
extern void sched_dl_do_global(void);
extern int sched_dl_overflow(struct task_struct *p, int policy, const struct sched_attr *attr);
extern void __setparam_dl(struct task_struct *p, const struct sched_attr *attr);
extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr);
extern bool __checkparam_dl(const struct sched_attr *attr);
extern bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr);
extern int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
extern int dl_bw_check_overflow(int cpu);
/*
* SCHED_DEADLINE supports servers (nested scheduling) with the following
* interface:
*
* dl_se::rq -- runqueue we belong to.
*
* dl_se::server_has_tasks() -- used on bandwidth enforcement; we 'stop' the
* server when it runs out of tasks to run.
*
* dl_se::server_pick() -- nested pick_next_task(); we yield the period if this
* returns NULL.
*
* dl_server_update() -- called from update_curr_common(), propagates runtime
* to the server.
*
* dl_server_start()
* dl_server_stop() -- start/stop the server when it has (no) tasks.
*
* dl_server_init() -- initializes the server.
*/
extern void dl_server_update(struct sched_dl_entity *dl_se, s64 delta_exec);
extern void dl_server_start(struct sched_dl_entity *dl_se);
extern void dl_server_stop(struct sched_dl_entity *dl_se);
extern void dl_server_init(struct sched_dl_entity *dl_se, struct rq *rq,
dl_server_has_tasks_f has_tasks,
dl_server_pick_f pick);
#ifdef CONFIG_CGROUP_SCHED
extern struct list_head task_groups;
struct cfs_bandwidth {
#ifdef CONFIG_CFS_BANDWIDTH
raw_spinlock_t lock;
ktime_t period;
u64 quota;
u64 runtime;
u64 burst;
u64 runtime_snap;
s64 hierarchical_quota;
u8 idle;
u8 period_active;
u8 slack_started;
struct hrtimer period_timer;
struct hrtimer slack_timer;
struct list_head throttled_cfs_rq;
/* Statistics: */
int nr_periods;
int nr_throttled;
int nr_burst;
u64 throttled_time;
u64 burst_time;
#endif
};
/* Task group related information */
struct task_group {
struct cgroup_subsys_state css;
#ifdef CONFIG_FAIR_GROUP_SCHED
/* schedulable entities of this group on each CPU */
struct sched_entity **se;
/* runqueue "owned" by this group on each CPU */
struct cfs_rq **cfs_rq;
unsigned long shares;
/* A positive value indicates that this is a SCHED_IDLE group. */
int idle;
#ifdef CONFIG_SMP
/*
* load_avg can be heavily contended at clock tick time, so put
* it in its own cache-line separated from the fields above which
* will also be accessed at each tick.
*/
atomic_long_t load_avg ____cacheline_aligned;
#endif
#endif
#ifdef CONFIG_RT_GROUP_SCHED
struct sched_rt_entity **rt_se;
struct rt_rq **rt_rq;
struct rt_bandwidth rt_bandwidth;
#endif
struct rcu_head rcu;
struct list_head list;
struct task_group *parent;
struct list_head siblings;
struct list_head children;
#ifdef CONFIG_SCHED_AUTOGROUP
struct autogroup *autogroup;
#endif
struct cfs_bandwidth cfs_bandwidth;
#ifdef CONFIG_UCLAMP_TASK_GROUP
/* The two decimal precision [%] value requested from user-space */
unsigned int uclamp_pct[UCLAMP_CNT];
/* Clamp values requested for a task group */
struct uclamp_se uclamp_req[UCLAMP_CNT];
/* Effective clamp values used for a task group */
struct uclamp_se uclamp[UCLAMP_CNT];
#endif
};
#ifdef CONFIG_FAIR_GROUP_SCHED
#define ROOT_TASK_GROUP_LOAD NICE_0_LOAD
/*
* A weight of 0 or 1 can cause arithmetics problems.
* A weight of a cfs_rq is the sum of weights of which entities
* are queued on this cfs_rq, so a weight of a entity should not be
* too large, so as the shares value of a task group.
* (The default weight is 1024 - so there's no practical
* limitation from this.)
*/
#define MIN_SHARES (1UL << 1)
#define MAX_SHARES (1UL << 18)
#endif
typedef int (*tg_visitor)(struct task_group *, void *);
extern int walk_tg_tree_from(struct task_group *from,
tg_visitor down, tg_visitor up, void *data);
/*
* Iterate the full tree, calling @down when first entering a node and @up when
* leaving it for the final time.
*
* Caller must hold rcu_lock or sufficient equivalent.
*/
static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data)
{
return walk_tg_tree_from(&root_task_group, down, up, data);
}
extern int tg_nop(struct task_group *tg, void *data);
#ifdef CONFIG_FAIR_GROUP_SCHED
extern void free_fair_sched_group(struct task_group *tg);
extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent);
extern void online_fair_sched_group(struct task_group *tg);
extern void unregister_fair_sched_group(struct task_group *tg);
#else
static inline void free_fair_sched_group(struct task_group *tg) { }
static inline int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
{
return 1;
}
static inline void online_fair_sched_group(struct task_group *tg) { }
static inline void unregister_fair_sched_group(struct task_group *tg) { }
#endif
extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
struct sched_entity *se, int cpu,
struct sched_entity *parent);
extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b, struct cfs_bandwidth *parent);
extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b);
extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq);
extern bool cfs_task_bw_constrained(struct task_struct *p);
extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
struct sched_rt_entity *rt_se, int cpu,
struct sched_rt_entity *parent);
extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us);
extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us);
extern long sched_group_rt_runtime(struct task_group *tg);
extern long sched_group_rt_period(struct task_group *tg);
extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
extern struct task_group *sched_create_group(struct task_group *parent);
extern void sched_online_group(struct task_group *tg,
struct task_group *parent);
extern void sched_destroy_group(struct task_group *tg);
extern void sched_release_group(struct task_group *tg);
extern void sched_move_task(struct task_struct *tsk);
#ifdef CONFIG_FAIR_GROUP_SCHED
extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
extern int sched_group_set_idle(struct task_group *tg, long idle);
#ifdef CONFIG_SMP
extern void set_task_rq_fair(struct sched_entity *se,
struct cfs_rq *prev, struct cfs_rq *next);
#else /* !CONFIG_SMP */
static inline void set_task_rq_fair(struct sched_entity *se,
struct cfs_rq *prev, struct cfs_rq *next) { }
#endif /* CONFIG_SMP */
#endif /* CONFIG_FAIR_GROUP_SCHED */
#else /* CONFIG_CGROUP_SCHED */
struct cfs_bandwidth { };
static inline bool cfs_task_bw_constrained(struct task_struct *p) { return false; }
#endif /* CONFIG_CGROUP_SCHED */
extern void unregister_rt_sched_group(struct task_group *tg);
extern void free_rt_sched_group(struct task_group *tg);
extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent);
/*
* u64_u32_load/u64_u32_store
*
* Use a copy of a u64 value to protect against data race. This is only
* applicable for 32-bits architectures.
*/
#ifdef CONFIG_64BIT
# define u64_u32_load_copy(var, copy) var
# define u64_u32_store_copy(var, copy, val) (var = val)
#else
# define u64_u32_load_copy(var, copy) \
({ \
u64 __val, __val_copy; \
do { \
__val_copy = copy; \
/* \
* paired with u64_u32_store_copy(), ordering access \
* to var and copy. \
*/ \
smp_rmb(); \
__val = var; \
} while (__val != __val_copy); \
__val; \
})
# define u64_u32_store_copy(var, copy, val) \
do { \
typeof(val) __val = (val); \
var = __val; \
/* \
* paired with u64_u32_load_copy(), ordering access to var and \
* copy. \
*/ \
smp_wmb(); \
copy = __val; \
} while (0)
#endif
# define u64_u32_load(var) u64_u32_load_copy(var, var##_copy)
# define u64_u32_store(var, val) u64_u32_store_copy(var, var##_copy, val)
/* CFS-related fields in a runqueue */
struct cfs_rq {
struct load_weight load;
unsigned int nr_running;
unsigned int h_nr_running; /* SCHED_{NORMAL,BATCH,IDLE} */
unsigned int idle_nr_running; /* SCHED_IDLE */
unsigned int idle_h_nr_running; /* SCHED_IDLE */
s64 avg_vruntime;
u64 avg_load;
u64 exec_clock;
u64 min_vruntime;
#ifdef CONFIG_SCHED_CORE
unsigned int forceidle_seq;
u64 min_vruntime_fi;
#endif
#ifndef CONFIG_64BIT
u64 min_vruntime_copy;
#endif
struct rb_root_cached tasks_timeline;
/*
* 'curr' points to currently running entity on this cfs_rq.
* It is set to NULL otherwise (i.e when none are currently running).
*/
struct sched_entity *curr;
struct sched_entity *next;
#ifdef CONFIG_SCHED_DEBUG
unsigned int nr_spread_over;
#endif
#ifdef CONFIG_SMP
/*
* CFS load tracking
*/
struct sched_avg avg;
#ifndef CONFIG_64BIT
u64 last_update_time_copy;
#endif
struct {
raw_spinlock_t lock ____cacheline_aligned;
int nr;
unsigned long load_avg;
unsigned long util_avg;
unsigned long runnable_avg;
} removed;
#ifdef CONFIG_FAIR_GROUP_SCHED
u64 last_update_tg_load_avg;
unsigned long tg_load_avg_contrib;
long propagate;
long prop_runnable_sum;
/*
* h_load = weight * f(tg)
*
* Where f(tg) is the recursive weight fraction assigned to
* this group.
*/
unsigned long h_load;
u64 last_h_load_update;
struct sched_entity *h_load_next;
#endif /* CONFIG_FAIR_GROUP_SCHED */
#endif /* CONFIG_SMP */
#ifdef CONFIG_FAIR_GROUP_SCHED
struct rq *rq; /* CPU runqueue to which this cfs_rq is attached */
/*
* leaf cfs_rqs are those that hold tasks (lowest schedulable entity in
* a hierarchy). Non-leaf lrqs hold other higher schedulable entities
* (like users, containers etc.)
*
* leaf_cfs_rq_list ties together list of leaf cfs_rq's in a CPU.
* This list is used during load balance.
*/
int on_list;
struct list_head leaf_cfs_rq_list;
struct task_group *tg; /* group that "owns" this runqueue */
/* Locally cached copy of our task_group's idle value */
int idle;
#ifdef CONFIG_CFS_BANDWIDTH
int runtime_enabled;
s64 runtime_remaining;
u64 throttled_pelt_idle;
#ifndef CONFIG_64BIT
u64 throttled_pelt_idle_copy;
#endif
u64 throttled_clock;
u64 throttled_clock_pelt;
u64 throttled_clock_pelt_time;
u64 throttled_clock_self;
u64 throttled_clock_self_time;
int throttled;
int throttle_count;
struct list_head throttled_list;
struct list_head throttled_csd_list;
#endif /* CONFIG_CFS_BANDWIDTH */
#endif /* CONFIG_FAIR_GROUP_SCHED */
};
#ifdef CONFIG_SCHED_CLASS_EXT
struct scx_rq {
struct scx_dispatch_q local_dsq;
struct list_head runnable_list; /* runnable tasks on this rq */
unsigned long ops_qseq;
u64 extra_enq_flags; /* see move_task_to_local_dsq() */
u32 nr_running;
};
#endif /* CONFIG_SCHED_CLASS_EXT */
static inline int rt_bandwidth_enabled(void)
{
return sysctl_sched_rt_runtime >= 0;
}
/* RT IPI pull logic requires IRQ_WORK */
#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_SMP)
# define HAVE_RT_PUSH_IPI
#endif
/* Real-Time classes' related field in a runqueue: */
struct rt_rq {
struct rt_prio_array active;
unsigned int rt_nr_running;
unsigned int rr_nr_running;
#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
struct {
int curr; /* highest queued rt task prio */
#ifdef CONFIG_SMP
int next; /* next highest */
#endif
} highest_prio;
#endif
#ifdef CONFIG_SMP
bool overloaded;
struct plist_head pushable_tasks;
#endif /* CONFIG_SMP */
int rt_queued;
int rt_throttled;
u64 rt_time;
u64 rt_runtime;
/* Nests inside the rq lock: */
raw_spinlock_t rt_runtime_lock;
#ifdef CONFIG_RT_GROUP_SCHED
unsigned int rt_nr_boosted;
struct rq *rq;
struct task_group *tg;
#endif
};
static inline bool rt_rq_is_runnable(struct rt_rq *rt_rq)
{
return rt_rq->rt_queued && rt_rq->rt_nr_running;
}
/* Deadline class' related fields in a runqueue */
struct dl_rq {
/* runqueue is an rbtree, ordered by deadline */
struct rb_root_cached root;
unsigned int dl_nr_running;
#ifdef CONFIG_SMP
/*
* Deadline values of the currently executing and the
* earliest ready task on this rq. Caching these facilitates
* the decision whether or not a ready but not running task
* should migrate somewhere else.
*/
struct {
u64 curr;
u64 next;
} earliest_dl;
bool overloaded;
/*
* Tasks on this rq that can be pushed away. They are kept in
* an rb-tree, ordered by tasks' deadlines, with caching
* of the leftmost (earliest deadline) element.
*/
struct rb_root_cached pushable_dl_tasks_root;
#else
struct dl_bw dl_bw;
#endif
/*
* "Active utilization" for this runqueue: increased when a
* task wakes up (becomes TASK_RUNNING) and decreased when a
* task blocks
*/
u64 running_bw;
/*
* Utilization of the tasks "assigned" to this runqueue (including
* the tasks that are in runqueue and the tasks that executed on this
* CPU and blocked). Increased when a task moves to this runqueue, and
* decreased when the task moves away (migrates, changes scheduling
* policy, or terminates).
* This is needed to compute the "inactive utilization" for the
* runqueue (inactive utilization = this_bw - running_bw).
*/
u64 this_bw;
u64 extra_bw;
/*
* Maximum available bandwidth for reclaiming by SCHED_FLAG_RECLAIM
* tasks of this rq. Used in calculation of reclaimable bandwidth(GRUB).
*/
u64 max_bw;
/*
* Inverse of the fraction of CPU utilization that can be reclaimed
* by the GRUB algorithm.
*/
u64 bw_ratio;
};
#ifdef CONFIG_FAIR_GROUP_SCHED
/* An entity is a task if it doesn't "own" a runqueue */
#define entity_is_task(se) (!se->my_q)
static inline void se_update_runnable(struct sched_entity *se)
{
if (!entity_is_task(se))
se->runnable_weight = se->my_q->h_nr_running;
}
static inline long se_runnable(struct sched_entity *se)
{
if (entity_is_task(se))
return !!se->on_rq;
else
return se->runnable_weight;
}
#else /* !CONFIG_FAIR_GROUP_SCHED: */
#define entity_is_task(se) 1
static inline void se_update_runnable(struct sched_entity *se) { }
static inline long se_runnable(struct sched_entity *se)
{
return !!se->on_rq;
}
#endif /* !CONFIG_FAIR_GROUP_SCHED */
#ifdef CONFIG_SMP
/*
* XXX we want to get rid of these helpers and use the full load resolution.
*/
static inline long se_weight(struct sched_entity *se)
{
return scale_load_down(se->load.weight);
}
static inline bool sched_asym_prefer(int a, int b)
{
return arch_asym_cpu_priority(a) > arch_asym_cpu_priority(b);
}
struct perf_domain {
struct em_perf_domain *em_pd;
struct perf_domain *next;
struct rcu_head rcu;
};
/*
* We add the notion of a root-domain which will be used to define per-domain
* variables. Each exclusive cpuset essentially defines an island domain by
* fully partitioning the member CPUs from any other cpuset. Whenever a new
* exclusive cpuset is created, we also create and attach a new root-domain
* object.
*
*/
struct root_domain {
atomic_t refcount;
atomic_t rto_count;
struct rcu_head rcu;
cpumask_var_t span;
cpumask_var_t online;
/*
* Indicate pullable load on at least one CPU, e.g:
* - More than one runnable task
* - Running task is misfit
*/
bool overloaded;
/* Indicate one or more CPUs over-utilized (tipping point) */
bool overutilized;
/*
* The bit corresponding to a CPU gets set here if such CPU has more
* than one runnable -deadline task (as it is below for RT tasks).
*/
cpumask_var_t dlo_mask;
atomic_t dlo_count;
struct dl_bw dl_bw;
struct cpudl cpudl;
/*
* Indicate whether a root_domain's dl_bw has been checked or
* updated. It's monotonously increasing value.
*
* Also, some corner cases, like 'wrap around' is dangerous, but given
* that u64 is 'big enough'. So that shouldn't be a concern.
*/
u64 visit_gen;
#ifdef HAVE_RT_PUSH_IPI
/*
* For IPI pull requests, loop across the rto_mask.
*/
struct irq_work rto_push_work;
raw_spinlock_t rto_lock;
/* These are only updated and read within rto_lock */
int rto_loop;
int rto_cpu;
/* These atomics are updated outside of a lock */
atomic_t rto_loop_next;
atomic_t rto_loop_start;
#endif
/*
* The "RT overload" flag: it gets set if a CPU has more than
* one runnable RT task.
*/
cpumask_var_t rto_mask;
struct cpupri cpupri;
/*
* NULL-terminated list of performance domains intersecting with the
* CPUs of the rd. Protected by RCU.
*/
struct perf_domain __rcu *pd;
};
extern void init_defrootdomain(void);
extern int sched_init_domains(const struct cpumask *cpu_map);
extern void rq_attach_root(struct rq *rq, struct root_domain *rd);
extern void sched_get_rd(struct root_domain *rd);
extern void sched_put_rd(struct root_domain *rd);
static inline int get_rd_overloaded(struct root_domain *rd)
{
return READ_ONCE(rd->overloaded);
}
static inline void set_rd_overloaded(struct root_domain *rd, int status)
{
if (get_rd_overloaded(rd) != status)
WRITE_ONCE(rd->overloaded, status);
}
#ifdef HAVE_RT_PUSH_IPI
extern void rto_push_irq_work_func(struct irq_work *work);
#endif
#endif /* CONFIG_SMP */
#ifdef CONFIG_UCLAMP_TASK
/*
* struct uclamp_bucket - Utilization clamp bucket
* @value: utilization clamp value for tasks on this clamp bucket
* @tasks: number of RUNNABLE tasks on this clamp bucket
*
* Keep track of how many tasks are RUNNABLE for a given utilization
* clamp value.
*/
struct uclamp_bucket {
unsigned long value : bits_per(SCHED_CAPACITY_SCALE);
unsigned long tasks : BITS_PER_LONG - bits_per(SCHED_CAPACITY_SCALE);
};
/*
* struct uclamp_rq - rq's utilization clamp
* @value: currently active clamp values for a rq
* @bucket: utilization clamp buckets affecting a rq
*
* Keep track of RUNNABLE tasks on a rq to aggregate their clamp values.
* A clamp value is affecting a rq when there is at least one task RUNNABLE
* (or actually running) with that value.
*
* There are up to UCLAMP_CNT possible different clamp values, currently there
* are only two: minimum utilization and maximum utilization.
*
* All utilization clamping values are MAX aggregated, since:
* - for util_min: we want to run the CPU at least at the max of the minimum
* utilization required by its currently RUNNABLE tasks.
* - for util_max: we want to allow the CPU to run up to the max of the
* maximum utilization allowed by its currently RUNNABLE tasks.
*
* Since on each system we expect only a limited number of different
* utilization clamp values (UCLAMP_BUCKETS), use a simple array to track
* the metrics required to compute all the per-rq utilization clamp values.
*/
struct uclamp_rq {
unsigned int value;
struct uclamp_bucket bucket[UCLAMP_BUCKETS];
};
DECLARE_STATIC_KEY_FALSE(sched_uclamp_used);
#endif /* CONFIG_UCLAMP_TASK */
struct balance_callback {
struct balance_callback *next;
void (*func)(struct rq *rq);
};
/*
* This is the main, per-CPU runqueue data structure.
*
* Locking rule: those places that want to lock multiple runqueues
* (such as the load balancing or the thread migration code), lock
* acquire operations must be ordered by ascending &runqueue.
*/
struct rq {
/* runqueue lock: */
raw_spinlock_t __lock;
unsigned int nr_running;
#ifdef CONFIG_NUMA_BALANCING
unsigned int nr_numa_running;
unsigned int nr_preferred_running;
unsigned int numa_migrate_on;
#endif
#ifdef CONFIG_NO_HZ_COMMON
#ifdef CONFIG_SMP
unsigned long last_blocked_load_update_tick;
unsigned int has_blocked_load;
call_single_data_t nohz_csd;
#endif /* CONFIG_SMP */
unsigned int nohz_tick_stopped;
atomic_t nohz_flags;
#endif /* CONFIG_NO_HZ_COMMON */
#ifdef CONFIG_SMP
unsigned int ttwu_pending;
#endif
u64 nr_switches;
#ifdef CONFIG_UCLAMP_TASK
/* Utilization clamp values based on CPU's RUNNABLE tasks */
struct uclamp_rq uclamp[UCLAMP_CNT] ____cacheline_aligned;
unsigned int uclamp_flags;
#define UCLAMP_FLAG_IDLE 0x01
#endif
struct cfs_rq cfs;
struct rt_rq rt;
struct dl_rq dl;
#ifdef CONFIG_SCHED_CLASS_EXT
struct scx_rq scx;
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
/* list of leaf cfs_rq on this CPU: */
struct list_head leaf_cfs_rq_list;
struct list_head *tmp_alone_branch;
#endif /* CONFIG_FAIR_GROUP_SCHED */
/*
* This is part of a global counter where only the total sum
* over all CPUs matters. A task can increase this counter on
* one CPU and if it got migrated afterwards it may decrease
* it on another CPU. Always updated under the runqueue lock:
*/
unsigned int nr_uninterruptible;
struct task_struct __rcu *curr;
struct task_struct *idle;
struct task_struct *stop;
unsigned long next_balance;
struct mm_struct *prev_mm;
unsigned int clock_update_flags;
u64 clock;
/* Ensure that all clocks are in the same cache line */
u64 clock_task ____cacheline_aligned;
u64 clock_pelt;
unsigned long lost_idle_time;
u64 clock_pelt_idle;
u64 clock_idle;
#ifndef CONFIG_64BIT
u64 clock_pelt_idle_copy;
u64 clock_idle_copy;
#endif
atomic_t nr_iowait;
#ifdef CONFIG_SCHED_DEBUG
u64 last_seen_need_resched_ns;
int ticks_without_resched;
#endif
#ifdef CONFIG_MEMBARRIER
int membarrier_state;
#endif
#ifdef CONFIG_SMP
struct root_domain *rd;
struct sched_domain __rcu *sd;
unsigned long cpu_capacity;
struct balance_callback *balance_callback;
unsigned char nohz_idle_balance;
unsigned char idle_balance;
unsigned long misfit_task_load;
/* For active balancing */
int active_balance;
int push_cpu;
struct cpu_stop_work active_balance_work;
/* CPU of this runqueue: */
int cpu;
int online;
struct list_head cfs_tasks;
struct sched_avg avg_rt;
struct sched_avg avg_dl;
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
struct sched_avg avg_irq;
#endif
#ifdef CONFIG_SCHED_HW_PRESSURE
struct sched_avg avg_hw;
#endif
u64 idle_stamp;
u64 avg_idle;
/* This is used to determine avg_idle's max value */
u64 max_idle_balance_cost;
#ifdef CONFIG_HOTPLUG_CPU
struct rcuwait hotplug_wait;
#endif
#endif /* CONFIG_SMP */
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
u64 prev_irq_time;
#endif
#ifdef CONFIG_PARAVIRT
u64 prev_steal_time;
#endif
#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
u64 prev_steal_time_rq;
#endif
/* calc_load related fields */
unsigned long calc_load_update;
long calc_load_active;
#ifdef CONFIG_SCHED_HRTICK
#ifdef CONFIG_SMP
call_single_data_t hrtick_csd;
#endif
struct hrtimer hrtick_timer;
ktime_t hrtick_time;
#endif
#ifdef CONFIG_SCHEDSTATS
/* latency stats */
struct sched_info rq_sched_info;
unsigned long long rq_cpu_time;
/* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
/* sys_sched_yield() stats */
unsigned int yld_count;
/* schedule() stats */
unsigned int sched_count;
unsigned int sched_goidle;
/* try_to_wake_up() stats */
unsigned int ttwu_count;
unsigned int ttwu_local;
#endif
#ifdef CONFIG_CPU_IDLE
/* Must be inspected within a RCU lock section */
struct cpuidle_state *idle_state;
#endif
#ifdef CONFIG_SMP
unsigned int nr_pinned;
#endif
unsigned int push_busy;
struct cpu_stop_work push_work;
#ifdef CONFIG_SCHED_CORE
/* per rq */
struct rq *core;
struct task_struct *core_pick;
unsigned int core_enabled;
unsigned int core_sched_seq;
struct rb_root core_tree;
/* shared state -- careful with sched_core_cpu_deactivate() */
unsigned int core_task_seq;
unsigned int core_pick_seq;
unsigned long core_cookie;
unsigned int core_forceidle_count;
unsigned int core_forceidle_seq;
unsigned int core_forceidle_occupation;
u64 core_forceidle_start;
#endif
/* Scratch cpumask to be temporarily used under rq_lock */
cpumask_var_t scratch_mask;
#if defined(CONFIG_CFS_BANDWIDTH) && defined(CONFIG_SMP)
call_single_data_t cfsb_csd;
struct list_head cfsb_csd_list;
#endif
};
#ifdef CONFIG_FAIR_GROUP_SCHED
/* CPU runqueue to which this cfs_rq is attached */
static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
{
return cfs_rq->rq;
}
#else
static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
{
return container_of(cfs_rq, struct rq, cfs);
}
#endif
static inline int cpu_of(struct rq *rq)
{
#ifdef CONFIG_SMP
return rq->cpu;
#else
return 0;
#endif
}
#define MDF_PUSH 0x01
static inline bool is_migration_disabled(struct task_struct *p)
{
#ifdef CONFIG_SMP
return p->migration_disabled;
#else
return false;
#endif
}
DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
#define cpu_rq(cpu) (&per_cpu(runqueues, (cpu)))
#define this_rq() this_cpu_ptr(&runqueues)
#define task_rq(p) cpu_rq(task_cpu(p))
#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
#define raw_rq() raw_cpu_ptr(&runqueues)
#ifdef CONFIG_SCHED_CORE
static inline struct cpumask *sched_group_span(struct sched_group *sg);
DECLARE_STATIC_KEY_FALSE(__sched_core_enabled);
static inline bool sched_core_enabled(struct rq *rq)
{
return static_branch_unlikely(&__sched_core_enabled) && rq->core_enabled;
}
static inline bool sched_core_disabled(void)
{
return !static_branch_unlikely(&__sched_core_enabled);
}
/*
* Be careful with this function; not for general use. The return value isn't
* stable unless you actually hold a relevant rq->__lock.
*/
static inline raw_spinlock_t *rq_lockp(struct rq *rq)
{
if (sched_core_enabled(rq))
return &rq->core->__lock;
return &rq->__lock;
}
static inline raw_spinlock_t *__rq_lockp(struct rq *rq)
{
if (rq->core_enabled)
return &rq->core->__lock;
return &rq->__lock;
}
extern bool
cfs_prio_less(const struct task_struct *a, const struct task_struct *b, bool fi);
extern void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi);
/*
* Helpers to check if the CPU's core cookie matches with the task's cookie
* when core scheduling is enabled.
* A special case is that the task's cookie always matches with CPU's core
* cookie if the CPU is in an idle core.
*/
static inline bool sched_cpu_cookie_match(struct rq *rq, struct task_struct *p)
{
/* Ignore cookie match if core scheduler is not enabled on the CPU. */
if (!sched_core_enabled(rq))
return true;
return rq->core->core_cookie == p->core_cookie;
}
static inline bool sched_core_cookie_match(struct rq *rq, struct task_struct *p)
{
bool idle_core = true;
int cpu;
/* Ignore cookie match if core scheduler is not enabled on the CPU. */
if (!sched_core_enabled(rq))
return true;
for_each_cpu(cpu, cpu_smt_mask(cpu_of(rq))) {
if (!available_idle_cpu(cpu)) {
idle_core = false;
break;
}
}
/*
* A CPU in an idle core is always the best choice for tasks with
* cookies.
*/
return idle_core || rq->core->core_cookie == p->core_cookie;
}
static inline bool sched_group_cookie_match(struct rq *rq,
struct task_struct *p,
struct sched_group *group)
{
int cpu;
/* Ignore cookie match if core scheduler is not enabled on the CPU. */
if (!sched_core_enabled(rq))
return true;
for_each_cpu_and(cpu, sched_group_span(group), p->cpus_ptr) {
if (sched_core_cookie_match(cpu_rq(cpu), p))
return true;
}
return false;
}
static inline bool sched_core_enqueued(struct task_struct *p)
{
return !RB_EMPTY_NODE(&p->core_node);
}
extern void sched_core_enqueue(struct rq *rq, struct task_struct *p);
extern void sched_core_dequeue(struct rq *rq, struct task_struct *p, int flags);
extern void sched_core_get(void);
extern void sched_core_put(void);
#else /* !CONFIG_SCHED_CORE: */
static inline bool sched_core_enabled(struct rq *rq)
{
return false;
}
static inline bool sched_core_disabled(void)
{
return true;
}
static inline raw_spinlock_t *rq_lockp(struct rq *rq)
{
return &rq->__lock;
}
static inline raw_spinlock_t *__rq_lockp(struct rq *rq)
{
return &rq->__lock;
}
static inline bool sched_cpu_cookie_match(struct rq *rq, struct task_struct *p)
{
return true;
}
static inline bool sched_core_cookie_match(struct rq *rq, struct task_struct *p)
{
return true;
}
static inline bool sched_group_cookie_match(struct rq *rq,
struct task_struct *p,
struct sched_group *group)
{
return true;
}
#endif /* !CONFIG_SCHED_CORE */
static inline void lockdep_assert_rq_held(struct rq *rq)
{
lockdep_assert_held(__rq_lockp(rq));
}
extern void raw_spin_rq_lock_nested(struct rq *rq, int subclass);
extern bool raw_spin_rq_trylock(struct rq *rq);
extern void raw_spin_rq_unlock(struct rq *rq);
static inline void raw_spin_rq_lock(struct rq *rq)
{
raw_spin_rq_lock_nested(rq, 0);
}
static inline void raw_spin_rq_lock_irq(struct rq *rq)
{
local_irq_disable();
raw_spin_rq_lock(rq);
}
static inline void raw_spin_rq_unlock_irq(struct rq *rq)
{
raw_spin_rq_unlock(rq);
local_irq_enable();
}
static inline unsigned long _raw_spin_rq_lock_irqsave(struct rq *rq)
{
unsigned long flags;
local_irq_save(flags);
raw_spin_rq_lock(rq);
return flags;
}
static inline void raw_spin_rq_unlock_irqrestore(struct rq *rq, unsigned long flags)
{
raw_spin_rq_unlock(rq);
local_irq_restore(flags);
}
#define raw_spin_rq_lock_irqsave(rq, flags) \
do { \
flags = _raw_spin_rq_lock_irqsave(rq); \
} while (0)
#ifdef CONFIG_SCHED_SMT
extern void __update_idle_core(struct rq *rq);
static inline void update_idle_core(struct rq *rq)
{
if (static_branch_unlikely(&sched_smt_present))
__update_idle_core(rq);
}
#else
static inline void update_idle_core(struct rq *rq) { }
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
static inline struct task_struct *task_of(struct sched_entity *se)
{
SCHED_WARN_ON(!entity_is_task(se));
return container_of(se, struct task_struct, se);
}
static inline struct cfs_rq *task_cfs_rq(struct task_struct *p)
{
return p->se.cfs_rq;
}
/* runqueue on which this entity is (to be) queued */
static inline struct cfs_rq *cfs_rq_of(const struct sched_entity *se)
{
return se->cfs_rq;
}
/* runqueue "owned" by this group */
static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
{
return grp->my_q;
}
#else /* !CONFIG_FAIR_GROUP_SCHED: */
#define task_of(_se) container_of(_se, struct task_struct, se)
static inline struct cfs_rq *task_cfs_rq(const struct task_struct *p)
{
return &task_rq(p)->cfs;
}
static inline struct cfs_rq *cfs_rq_of(const struct sched_entity *se)
{
const struct task_struct *p = task_of(se);
struct rq *rq = task_rq(p);
return &rq->cfs;
}
/* runqueue "owned" by this group */
static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
{
return NULL;
}
#endif /* !CONFIG_FAIR_GROUP_SCHED */
extern void update_rq_clock(struct rq *rq);
/*
* rq::clock_update_flags bits
*
* %RQCF_REQ_SKIP - will request skipping of clock update on the next
* call to __schedule(). This is an optimisation to avoid
* neighbouring rq clock updates.
*
* %RQCF_ACT_SKIP - is set from inside of __schedule() when skipping is
* in effect and calls to update_rq_clock() are being ignored.
*
* %RQCF_UPDATED - is a debug flag that indicates whether a call has been
* made to update_rq_clock() since the last time rq::lock was pinned.
*
* If inside of __schedule(), clock_update_flags will have been
* shifted left (a left shift is a cheap operation for the fast path
* to promote %RQCF_REQ_SKIP to %RQCF_ACT_SKIP), so you must use,
*
* if (rq-clock_update_flags >= RQCF_UPDATED)
*
* to check if %RQCF_UPDATED is set. It'll never be shifted more than
* one position though, because the next rq_unpin_lock() will shift it
* back.
*/
#define RQCF_REQ_SKIP 0x01
#define RQCF_ACT_SKIP 0x02
#define RQCF_UPDATED 0x04
static inline void assert_clock_updated(struct rq *rq)
{
/*
* The only reason for not seeing a clock update since the
* last rq_pin_lock() is if we're currently skipping updates.
*/
SCHED_WARN_ON(rq->clock_update_flags < RQCF_ACT_SKIP);
}
static inline u64 rq_clock(struct rq *rq)
{
lockdep_assert_rq_held(rq);
assert_clock_updated(rq);
return rq->clock;
}
static inline u64 rq_clock_task(struct rq *rq)
{
lockdep_assert_rq_held(rq);
assert_clock_updated(rq);
return rq->clock_task;
}
static inline void rq_clock_skip_update(struct rq *rq)
{
lockdep_assert_rq_held(rq);
rq->clock_update_flags |= RQCF_REQ_SKIP;
}
/*
* See rt task throttling, which is the only time a skip
* request is canceled.
*/
static inline void rq_clock_cancel_skipupdate(struct rq *rq)
{
lockdep_assert_rq_held(rq);
rq->clock_update_flags &= ~RQCF_REQ_SKIP;
}
/*
* During cpu offlining and rq wide unthrottling, we can trigger
* an update_rq_clock() for several cfs and rt runqueues (Typically
* when using list_for_each_entry_*)
* rq_clock_start_loop_update() can be called after updating the clock
* once and before iterating over the list to prevent multiple update.
* After the iterative traversal, we need to call rq_clock_stop_loop_update()
* to clear RQCF_ACT_SKIP of rq->clock_update_flags.
*/
static inline void rq_clock_start_loop_update(struct rq *rq)
{
lockdep_assert_rq_held(rq);
SCHED_WARN_ON(rq->clock_update_flags & RQCF_ACT_SKIP);
rq->clock_update_flags |= RQCF_ACT_SKIP;
}
static inline void rq_clock_stop_loop_update(struct rq *rq)
{
lockdep_assert_rq_held(rq);
rq->clock_update_flags &= ~RQCF_ACT_SKIP;
}
struct rq_flags {
unsigned long flags;
struct pin_cookie cookie;
#ifdef CONFIG_SCHED_DEBUG
/*
* A copy of (rq::clock_update_flags & RQCF_UPDATED) for the
* current pin context is stashed here in case it needs to be
* restored in rq_repin_lock().
*/
unsigned int clock_update_flags;
#endif
};
extern struct balance_callback balance_push_callback;
/*
* Lockdep annotation that avoids accidental unlocks; it's like a
* sticky/continuous lockdep_assert_held().
*
* This avoids code that has access to 'struct rq *rq' (basically everything in
* the scheduler) from accidentally unlocking the rq if they do not also have a
* copy of the (on-stack) 'struct rq_flags rf'.
*
* Also see Documentation/locking/lockdep-design.rst.
*/
static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf)
{
rf->cookie = lockdep_pin_lock(__rq_lockp(rq));
#ifdef CONFIG_SCHED_DEBUG
rq->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP);
rf->clock_update_flags = 0;
# ifdef CONFIG_SMP
SCHED_WARN_ON(rq->balance_callback && rq->balance_callback != &balance_push_callback);
# endif
#endif
}
static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf)
{
#ifdef CONFIG_SCHED_DEBUG
if (rq->clock_update_flags > RQCF_ACT_SKIP)
rf->clock_update_flags = RQCF_UPDATED;
#endif
lockdep_unpin_lock(__rq_lockp(rq), rf->cookie);
}
static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf)
{
lockdep_repin_lock(__rq_lockp(rq), rf->cookie);
#ifdef CONFIG_SCHED_DEBUG
/*
* Restore the value we stashed in @rf for this pin context.
*/
rq->clock_update_flags |= rf->clock_update_flags;
#endif
}
extern
struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf)
__acquires(rq->lock);
extern
struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
__acquires(p->pi_lock)
__acquires(rq->lock);
static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
raw_spin_rq_unlock(rq);
}
static inline void
task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
__releases(rq->lock)
__releases(p->pi_lock)
{
rq_unpin_lock(rq, rf);
raw_spin_rq_unlock(rq);
raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
}
DEFINE_LOCK_GUARD_1(task_rq_lock, struct task_struct,
_T->rq = task_rq_lock(_T->lock, &_T->rf),
task_rq_unlock(_T->rq, _T->lock, &_T->rf),
struct rq *rq; struct rq_flags rf)
static inline void rq_lock_irqsave(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
raw_spin_rq_lock_irqsave(rq, rf->flags);
rq_pin_lock(rq, rf);
}
static inline void rq_lock_irq(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
raw_spin_rq_lock_irq(rq);
rq_pin_lock(rq, rf);
}
static inline void rq_lock(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
raw_spin_rq_lock(rq);
rq_pin_lock(rq, rf);
}
static inline void rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
raw_spin_rq_unlock_irqrestore(rq, rf->flags);
}
static inline void rq_unlock_irq(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
raw_spin_rq_unlock_irq(rq);
}
static inline void rq_unlock(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
raw_spin_rq_unlock(rq);
}
DEFINE_LOCK_GUARD_1(rq_lock, struct rq,
rq_lock(_T->lock, &_T->rf),
rq_unlock(_T->lock, &_T->rf),
struct rq_flags rf)
DEFINE_LOCK_GUARD_1(rq_lock_irq, struct rq,
rq_lock_irq(_T->lock, &_T->rf),
rq_unlock_irq(_T->lock, &_T->rf),
struct rq_flags rf)
DEFINE_LOCK_GUARD_1(rq_lock_irqsave, struct rq,
rq_lock_irqsave(_T->lock, &_T->rf),
rq_unlock_irqrestore(_T->lock, &_T->rf),
struct rq_flags rf)
static inline struct rq *this_rq_lock_irq(struct rq_flags *rf)
__acquires(rq->lock)
{
struct rq *rq;
local_irq_disable();
rq = this_rq();
rq_lock(rq, rf);
return rq;
}
#ifdef CONFIG_NUMA
enum numa_topology_type {
NUMA_DIRECT,
NUMA_GLUELESS_MESH,
NUMA_BACKPLANE,
};
extern enum numa_topology_type sched_numa_topology_type;
extern int sched_max_numa_distance;
extern bool find_numa_distance(int distance);
extern void sched_init_numa(int offline_node);
extern void sched_update_numa(int cpu, bool online);
extern void sched_domains_numa_masks_set(unsigned int cpu);
extern void sched_domains_numa_masks_clear(unsigned int cpu);
extern int sched_numa_find_closest(const struct cpumask *cpus, int cpu);
#else /* !CONFIG_NUMA: */
static inline void sched_init_numa(int offline_node) { }
static inline void sched_update_numa(int cpu, bool online) { }
static inline void sched_domains_numa_masks_set(unsigned int cpu) { }
static inline void sched_domains_numa_masks_clear(unsigned int cpu) { }
static inline int sched_numa_find_closest(const struct cpumask *cpus, int cpu)
{
return nr_cpu_ids;
}
#endif /* !CONFIG_NUMA */
#ifdef CONFIG_NUMA_BALANCING
/* The regions in numa_faults array from task_struct */
enum numa_faults_stats {
NUMA_MEM = 0,
NUMA_CPU,
NUMA_MEMBUF,
NUMA_CPUBUF
};
extern void sched_setnuma(struct task_struct *p, int node);
extern int migrate_task_to(struct task_struct *p, int cpu);
extern int migrate_swap(struct task_struct *p, struct task_struct *t,
int cpu, int scpu);
extern void init_numa_balancing(unsigned long clone_flags, struct task_struct *p);
#else /* !CONFIG_NUMA_BALANCING: */
static inline void
init_numa_balancing(unsigned long clone_flags, struct task_struct *p)
{
}
#endif /* !CONFIG_NUMA_BALANCING */
#ifdef CONFIG_SMP
static inline void
queue_balance_callback(struct rq *rq,
struct balance_callback *head,
void (*func)(struct rq *rq))
{
lockdep_assert_rq_held(rq);
/*
* Don't (re)queue an already queued item; nor queue anything when
* balance_push() is active, see the comment with
* balance_push_callback.
*/
if (unlikely(head->next || rq->balance_callback == &balance_push_callback))
return;
head->func = func;
head->next = rq->balance_callback;
rq->balance_callback = head;
}
#define rcu_dereference_check_sched_domain(p) \
rcu_dereference_check((p), lockdep_is_held(&sched_domains_mutex))
/*
* The domain tree (rq->sd) is protected by RCU's quiescent state transition.
* See destroy_sched_domains: call_rcu for details.
*
* The domain tree of any CPU may only be accessed from within
* preempt-disabled sections.
*/
#define for_each_domain(cpu, __sd) \
for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \
__sd; __sd = __sd->parent)
/* A mask of all the SD flags that have the SDF_SHARED_CHILD metaflag */
#define SD_FLAG(name, mflags) (name * !!((mflags) & SDF_SHARED_CHILD)) |
static const unsigned int SD_SHARED_CHILD_MASK =
#include <linux/sched/sd_flags.h>
0;
#undef SD_FLAG
/**
* highest_flag_domain - Return highest sched_domain containing flag.
* @cpu: The CPU whose highest level of sched domain is to
* be returned.
* @flag: The flag to check for the highest sched_domain
* for the given CPU.
*
* Returns the highest sched_domain of a CPU which contains @flag. If @flag has
* the SDF_SHARED_CHILD metaflag, all the children domains also have @flag.
*/
static inline struct sched_domain *highest_flag_domain(int cpu, int flag)
{
struct sched_domain *sd, *hsd = NULL;
for_each_domain(cpu, sd) {
if (sd->flags & flag) {
hsd = sd;
continue;
}
/*
* Stop the search if @flag is known to be shared at lower
* levels. It will not be found further up.
*/
if (flag & SD_SHARED_CHILD_MASK)
break;
}
return hsd;
}
static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
{
struct sched_domain *sd;
for_each_domain(cpu, sd) {
if (sd->flags & flag)
break;
}
return sd;
}
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_llc);
DECLARE_PER_CPU(int, sd_llc_size);
DECLARE_PER_CPU(int, sd_llc_id);
DECLARE_PER_CPU(int, sd_share_id);
DECLARE_PER_CPU(struct sched_domain_shared __rcu *, sd_llc_shared);
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_numa);
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_packing);
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_cpucapacity);
extern struct static_key_false sched_asym_cpucapacity;
extern struct static_key_false sched_cluster_active;
static __always_inline bool sched_asym_cpucap_active(void)
{
return static_branch_unlikely(&sched_asym_cpucapacity);
}
struct sched_group_capacity {
atomic_t ref;
/*
* CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity
* for a single CPU.
*/
unsigned long capacity;
unsigned long min_capacity; /* Min per-CPU capacity in group */
unsigned long max_capacity; /* Max per-CPU capacity in group */
unsigned long next_update;
int imbalance; /* XXX unrelated to capacity but shared group state */
#ifdef CONFIG_SCHED_DEBUG
int id;
#endif
unsigned long cpumask[]; /* Balance mask */
};
struct sched_group {
struct sched_group *next; /* Must be a circular list */
atomic_t ref;
unsigned int group_weight;
unsigned int cores;
struct sched_group_capacity *sgc;
int asym_prefer_cpu; /* CPU of highest priority in group */
int flags;
/*
* The CPUs this group covers.
*
* NOTE: this field is variable length. (Allocated dynamically
* by attaching extra space to the end of the structure,
* depending on how many CPUs the kernel has booted up with)
*/
unsigned long cpumask[];
};
static inline struct cpumask *sched_group_span(struct sched_group *sg)
{
return to_cpumask(sg->cpumask);
}
/*
* See build_balance_mask().
*/
static inline struct cpumask *group_balance_mask(struct sched_group *sg)
{
return to_cpumask(sg->sgc->cpumask);
}
extern int group_balance_cpu(struct sched_group *sg);
#ifdef CONFIG_SCHED_DEBUG
extern void update_sched_domain_debugfs(void);
extern void dirty_sched_domain_sysctl(int cpu);
#else
static inline void update_sched_domain_debugfs(void) { }
static inline void dirty_sched_domain_sysctl(int cpu) { }
#endif
extern int sched_update_scaling(void);
static inline const struct cpumask *task_user_cpus(struct task_struct *p)
{
if (!p->user_cpus_ptr)
return cpu_possible_mask; /* &init_task.cpus_mask */
return p->user_cpus_ptr;
}
#endif /* CONFIG_SMP */
#include "stats.h"
#if defined(CONFIG_SCHED_CORE) && defined(CONFIG_SCHEDSTATS)
extern void __sched_core_account_forceidle(struct rq *rq);
static inline void sched_core_account_forceidle(struct rq *rq)
{
if (schedstat_enabled())
__sched_core_account_forceidle(rq);
}
extern void __sched_core_tick(struct rq *rq);
static inline void sched_core_tick(struct rq *rq)
{
if (sched_core_enabled(rq) && schedstat_enabled())
__sched_core_tick(rq);
}
#else /* !(CONFIG_SCHED_CORE && CONFIG_SCHEDSTATS): */
static inline void sched_core_account_forceidle(struct rq *rq) { }
static inline void sched_core_tick(struct rq *rq) { }
#endif /* !(CONFIG_SCHED_CORE && CONFIG_SCHEDSTATS) */
#ifdef CONFIG_CGROUP_SCHED
/*
* Return the group to which this tasks belongs.
*
* We cannot use task_css() and friends because the cgroup subsystem
* changes that value before the cgroup_subsys::attach() method is called,
* therefore we cannot pin it and might observe the wrong value.
*
* The same is true for autogroup's p->signal->autogroup->tg, the autogroup
* core changes this before calling sched_move_task().
*
* Instead we use a 'copy' which is updated from sched_move_task() while
* holding both task_struct::pi_lock and rq::lock.
*/
static inline struct task_group *task_group(struct task_struct *p)
{
return p->sched_task_group;
}
/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
{
#if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED)
struct task_group *tg = task_group(p);
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]);
p->se.cfs_rq = tg->cfs_rq[cpu];
p->se.parent = tg->se[cpu];
p->se.depth = tg->se[cpu] ? tg->se[cpu]->depth + 1 : 0;
#endif
#ifdef CONFIG_RT_GROUP_SCHED
p->rt.rt_rq = tg->rt_rq[cpu];
p->rt.parent = tg->rt_se[cpu];
#endif
}
#else /* !CONFIG_CGROUP_SCHED: */
static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
static inline struct task_group *task_group(struct task_struct *p)
{
return NULL;
}
#endif /* !CONFIG_CGROUP_SCHED */
static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
{
set_task_rq(p, cpu);
#ifdef CONFIG_SMP
/*
* After ->cpu is set up to a new value, task_rq_lock(p, ...) can be
* successfully executed on another CPU. We must ensure that updates of
* per-task data have been completed by this moment.
*/
smp_wmb();
WRITE_ONCE(task_thread_info(p)->cpu, cpu);
p->wake_cpu = cpu;
#endif
}
/*
* Tunables that become constants when CONFIG_SCHED_DEBUG is off:
*/
#ifdef CONFIG_SCHED_DEBUG
# define const_debug __read_mostly
#else
# define const_debug const
#endif
#define SCHED_FEAT(name, enabled) \
__SCHED_FEAT_##name ,
enum {
#include "features.h"
__SCHED_FEAT_NR,
};
#undef SCHED_FEAT
#ifdef CONFIG_SCHED_DEBUG
/*
* To support run-time toggling of sched features, all the translation units
* (but core.c) reference the sysctl_sched_features defined in core.c.
*/
extern const_debug unsigned int sysctl_sched_features;
#ifdef CONFIG_JUMP_LABEL
#define SCHED_FEAT(name, enabled) \
static __always_inline bool static_branch_##name(struct static_key *key) \
{ \
return static_key_##enabled(key); \
}
#include "features.h"
#undef SCHED_FEAT
extern struct static_key sched_feat_keys[__SCHED_FEAT_NR];
#define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))
#else /* !CONFIG_JUMP_LABEL: */
#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
#endif /* !CONFIG_JUMP_LABEL */
#else /* !SCHED_DEBUG: */
/*
* Each translation unit has its own copy of sysctl_sched_features to allow
* constants propagation at compile time and compiler optimization based on
* features default.
*/
#define SCHED_FEAT(name, enabled) \
(1UL << __SCHED_FEAT_##name) * enabled |
static const_debug __maybe_unused unsigned int sysctl_sched_features =
#include "features.h"
0;
#undef SCHED_FEAT
#define sched_feat(x) !!(sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
#endif /* !SCHED_DEBUG */
extern struct static_key_false sched_numa_balancing;
extern struct static_key_false sched_schedstats;
static inline u64 global_rt_period(void)
{
return (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
}
static inline u64 global_rt_runtime(void)
{
if (sysctl_sched_rt_runtime < 0)
return RUNTIME_INF;
return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
}
static inline int task_current(struct rq *rq, struct task_struct *p)
{
return rq->curr == p;
}
static inline int task_on_cpu(struct rq *rq, struct task_struct *p)
{
#ifdef CONFIG_SMP
return p->on_cpu;
#else
return task_current(rq, p);
#endif
}
static inline int task_on_rq_queued(struct task_struct *p)
{
return p->on_rq == TASK_ON_RQ_QUEUED;
}
static inline int task_on_rq_migrating(struct task_struct *p)
{
return READ_ONCE(p->on_rq) == TASK_ON_RQ_MIGRATING;
}
/* Wake flags. The first three directly map to some SD flag value */
#define WF_EXEC 0x02 /* Wakeup after exec; maps to SD_BALANCE_EXEC */
#define WF_FORK 0x04 /* Wakeup after fork; maps to SD_BALANCE_FORK */
#define WF_TTWU 0x08 /* Wakeup; maps to SD_BALANCE_WAKE */
#define WF_SYNC 0x10 /* Waker goes to sleep after wakeup */
#define WF_MIGRATED 0x20 /* Internal use, task got migrated */
#define WF_CURRENT_CPU 0x40 /* Prefer to move the wakee to the current CPU. */
#ifdef CONFIG_SMP
static_assert(WF_EXEC == SD_BALANCE_EXEC);
static_assert(WF_FORK == SD_BALANCE_FORK);
static_assert(WF_TTWU == SD_BALANCE_WAKE);
#endif
/*
* To aid in avoiding the subversion of "niceness" due to uneven distribution
* of tasks with abnormal "nice" values across CPUs the contribution that
* each task makes to its run queue's load is weighted according to its
* scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a
* scaled version of the new time slice allocation that they receive on time
* slice expiry etc.
*/
#define WEIGHT_IDLEPRIO 3
#define WMULT_IDLEPRIO 1431655765
extern const int sched_prio_to_weight[40];
extern const u32 sched_prio_to_wmult[40];
/*
* {de,en}queue flags:
*
* DEQUEUE_SLEEP - task is no longer runnable
* ENQUEUE_WAKEUP - task just became runnable
*
* SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks
* are in a known state which allows modification. Such pairs
* should preserve as much state as possible.
*
* MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location
* in the runqueue.
*
* NOCLOCK - skip the update_rq_clock() (avoids double updates)
*
* MIGRATION - p->on_rq == TASK_ON_RQ_MIGRATING (used for DEADLINE)
*
* ENQUEUE_HEAD - place at front of runqueue (tail if not specified)
* ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline)
* ENQUEUE_MIGRATED - the task was migrated during wakeup
*
*/
#define DEQUEUE_SLEEP 0x01
#define DEQUEUE_SAVE 0x02 /* Matches ENQUEUE_RESTORE */
#define DEQUEUE_MOVE 0x04 /* Matches ENQUEUE_MOVE */
#define DEQUEUE_NOCLOCK 0x08 /* Matches ENQUEUE_NOCLOCK */
#define DEQUEUE_MIGRATING 0x100 /* Matches ENQUEUE_MIGRATING */
#define ENQUEUE_WAKEUP 0x01
#define ENQUEUE_RESTORE 0x02
#define ENQUEUE_MOVE 0x04
#define ENQUEUE_NOCLOCK 0x08
#define ENQUEUE_HEAD 0x10
#define ENQUEUE_REPLENISH 0x20
#ifdef CONFIG_SMP
#define ENQUEUE_MIGRATED 0x40
#else
#define ENQUEUE_MIGRATED 0x00
#endif
#define ENQUEUE_INITIAL 0x80
#define ENQUEUE_MIGRATING 0x100
#define RETRY_TASK ((void *)-1UL)
struct affinity_context {
const struct cpumask *new_mask;
struct cpumask *user_mask;
unsigned int flags;
};
extern s64 update_curr_common(struct rq *rq);
struct sched_class {
#ifdef CONFIG_UCLAMP_TASK
int uclamp_enabled;
#endif
void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
void (*yield_task) (struct rq *rq);
bool (*yield_to_task)(struct rq *rq, struct task_struct *p);
void (*wakeup_preempt)(struct rq *rq, struct task_struct *p, int flags);
struct task_struct *(*pick_next_task)(struct rq *rq);
void (*put_prev_task)(struct rq *rq, struct task_struct *p);
void (*set_next_task)(struct rq *rq, struct task_struct *p, bool first);
#ifdef CONFIG_SMP
int (*balance)(struct rq *rq, struct task_struct *prev, struct rq_flags *rf);
int (*select_task_rq)(struct task_struct *p, int task_cpu, int flags);
struct task_struct * (*pick_task)(struct rq *rq);
void (*migrate_task_rq)(struct task_struct *p, int new_cpu);
void (*task_woken)(struct rq *this_rq, struct task_struct *task);
void (*set_cpus_allowed)(struct task_struct *p, struct affinity_context *ctx);
void (*rq_online)(struct rq *rq);
void (*rq_offline)(struct rq *rq);
struct rq *(*find_lock_rq)(struct task_struct *p, struct rq *rq);
#endif
void (*task_tick)(struct rq *rq, struct task_struct *p, int queued);
void (*task_fork)(struct task_struct *p);
void (*task_dead)(struct task_struct *p);
/*
* The switched_from() call is allowed to drop rq->lock, therefore we
* cannot assume the switched_from/switched_to pair is serialized by
* rq->lock. They are however serialized by p->pi_lock.
*/
void (*switching_to) (struct rq *this_rq, struct task_struct *task);
void (*switched_from)(struct rq *this_rq, struct task_struct *task);
void (*switched_to) (struct rq *this_rq, struct task_struct *task);
void (*reweight_task)(struct rq *this_rq, struct task_struct *task,
int newprio);
void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
int oldprio);
unsigned int (*get_rr_interval)(struct rq *rq,
struct task_struct *task);
void (*update_curr)(struct rq *rq);
#ifdef CONFIG_FAIR_GROUP_SCHED
void (*task_change_group)(struct task_struct *p);
#endif
#ifdef CONFIG_SCHED_CORE
int (*task_is_throttled)(struct task_struct *p, int cpu);
#endif
};
static inline void put_prev_task(struct rq *rq, struct task_struct *prev)
{
WARN_ON_ONCE(rq->curr != prev);
prev->sched_class->put_prev_task(rq, prev);
}
static inline void set_next_task(struct rq *rq, struct task_struct *next)
{
next->sched_class->set_next_task(rq, next, false);
}
/*
* Helper to define a sched_class instance; each one is placed in a separate
* section which is ordered by the linker script:
*
* include/asm-generic/vmlinux.lds.h
*
* *CAREFUL* they are laid out in *REVERSE* order!!!
*
* Also enforce alignment on the instance, not the type, to guarantee layout.
*/
#define DEFINE_SCHED_CLASS(name) \
const struct sched_class name##_sched_class \
__aligned(__alignof__(struct sched_class)) \
__section("__" #name "_sched_class")
/* Defined in include/asm-generic/vmlinux.lds.h */
extern struct sched_class __sched_class_highest[];
extern struct sched_class __sched_class_lowest[];
#define for_class_range(class, _from, _to) \
for (class = (_from); class < (_to); class++)
#define for_each_class(class) \
for_class_range(class, __sched_class_highest, __sched_class_lowest)
#define sched_class_above(_a, _b) ((_a) < (_b))
extern const struct sched_class stop_sched_class;
extern const struct sched_class dl_sched_class;
extern const struct sched_class rt_sched_class;
extern const struct sched_class fair_sched_class;
extern const struct sched_class idle_sched_class;
static inline bool sched_stop_runnable(struct rq *rq)
{
return rq->stop && task_on_rq_queued(rq->stop);
}
static inline bool sched_dl_runnable(struct rq *rq)
{
return rq->dl.dl_nr_running > 0;
}
static inline bool sched_rt_runnable(struct rq *rq)
{
return rq->rt.rt_queued > 0;
}
static inline bool sched_fair_runnable(struct rq *rq)
{
return rq->cfs.nr_running > 0;
}
extern struct task_struct *pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf);
extern struct task_struct *pick_next_task_idle(struct rq *rq);
#define SCA_CHECK 0x01
#define SCA_MIGRATE_DISABLE 0x02
#define SCA_MIGRATE_ENABLE 0x04
#define SCA_USER 0x08
#ifdef CONFIG_SMP
extern void update_group_capacity(struct sched_domain *sd, int cpu);
extern void sched_balance_trigger(struct rq *rq);
extern int __set_cpus_allowed_ptr(struct task_struct *p, struct affinity_context *ctx);
extern void set_cpus_allowed_common(struct task_struct *p, struct affinity_context *ctx);
static inline cpumask_t *alloc_user_cpus_ptr(int node)
{
/*
* See do_set_cpus_allowed() above for the rcu_head usage.
*/
int size = max_t(int, cpumask_size(), sizeof(struct rcu_head));
return kmalloc_node(size, GFP_KERNEL, node);
}
static inline struct task_struct *get_push_task(struct rq *rq)
{
struct task_struct *p = rq->curr;
lockdep_assert_rq_held(rq);
if (rq->push_busy)
return NULL;
if (p->nr_cpus_allowed == 1)
return NULL;
if (p->migration_disabled)
return NULL;
rq->push_busy = true;
return get_task_struct(p);
}
extern int push_cpu_stop(void *arg);
#else /* !CONFIG_SMP: */
static inline int __set_cpus_allowed_ptr(struct task_struct *p,
struct affinity_context *ctx)
{
return set_cpus_allowed_ptr(p, ctx->new_mask);
}
static inline cpumask_t *alloc_user_cpus_ptr(int node)
{
return NULL;
}
#endif /* !CONFIG_SMP */
#ifdef CONFIG_CPU_IDLE
static inline void idle_set_state(struct rq *rq,
struct cpuidle_state *idle_state)
{
rq->idle_state = idle_state;
}
static inline struct cpuidle_state *idle_get_state(struct rq *rq)
{
SCHED_WARN_ON(!rcu_read_lock_held());
return rq->idle_state;
}
#else /* !CONFIG_CPU_IDLE: */
static inline void idle_set_state(struct rq *rq,
struct cpuidle_state *idle_state)
{
}
static inline struct cpuidle_state *idle_get_state(struct rq *rq)
{
return NULL;
}
#endif /* !CONFIG_CPU_IDLE */
extern void schedule_idle(void);
asmlinkage void schedule_user(void);
extern void sysrq_sched_debug_show(void);
extern void sched_init_granularity(void);
extern void update_max_interval(void);
extern void init_sched_dl_class(void);
extern void init_sched_rt_class(void);
extern void init_sched_fair_class(void);
extern void resched_curr(struct rq *rq);
extern void resched_cpu(int cpu);
extern struct rt_bandwidth def_rt_bandwidth;
extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);
extern bool sched_rt_bandwidth_account(struct rt_rq *rt_rq);
extern void init_dl_entity(struct sched_dl_entity *dl_se);
#define BW_SHIFT 20
#define BW_UNIT (1 << BW_SHIFT)
#define RATIO_SHIFT 8
#define MAX_BW_BITS (64 - BW_SHIFT)
#define MAX_BW ((1ULL << MAX_BW_BITS) - 1)
extern unsigned long to_ratio(u64 period, u64 runtime);
extern void init_entity_runnable_average(struct sched_entity *se);
extern void post_init_entity_util_avg(struct task_struct *p);
#ifdef CONFIG_NO_HZ_FULL
extern bool sched_can_stop_tick(struct rq *rq);
extern int __init sched_tick_offload_init(void);
/*
* Tick may be needed by tasks in the runqueue depending on their policy and
* requirements. If tick is needed, lets send the target an IPI to kick it out of
* nohz mode if necessary.
*/
static inline void sched_update_tick_dependency(struct rq *rq)
{
int cpu = cpu_of(rq);
if (!tick_nohz_full_cpu(cpu))
return;
if (sched_can_stop_tick(rq))
tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED);
else
tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED);
}
#else /* !CONFIG_NO_HZ_FULL: */
static inline int sched_tick_offload_init(void) { return 0; }
static inline void sched_update_tick_dependency(struct rq *rq) { }
#endif /* !CONFIG_NO_HZ_FULL */
static inline void add_nr_running(struct rq *rq, unsigned count)
{
unsigned prev_nr = rq->nr_running;
rq->nr_running = prev_nr + count;
if (trace_sched_update_nr_running_tp_enabled()) {
call_trace_sched_update_nr_running(rq, count);
}
#ifdef CONFIG_SMP
if (prev_nr < 2 && rq->nr_running >= 2)
set_rd_overloaded(rq->rd, 1);
#endif
sched_update_tick_dependency(rq);
}
static inline void sub_nr_running(struct rq *rq, unsigned count)
{
rq->nr_running -= count;
if (trace_sched_update_nr_running_tp_enabled()) {
call_trace_sched_update_nr_running(rq, -count);
}
/* Check if we still need preemption */
sched_update_tick_dependency(rq);
}
extern void activate_task(struct rq *rq, struct task_struct *p, int flags);
extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags);
extern void wakeup_preempt(struct rq *rq, struct task_struct *p, int flags);
#ifdef CONFIG_PREEMPT_RT
# define SCHED_NR_MIGRATE_BREAK 8
#else
# define SCHED_NR_MIGRATE_BREAK 32
#endif
extern const_debug unsigned int sysctl_sched_nr_migrate;
extern const_debug unsigned int sysctl_sched_migration_cost;
extern unsigned int sysctl_sched_base_slice;
#ifdef CONFIG_SCHED_DEBUG
extern int sysctl_resched_latency_warn_ms;
extern int sysctl_resched_latency_warn_once;
extern unsigned int sysctl_sched_tunable_scaling;
extern unsigned int sysctl_numa_balancing_scan_delay;
extern unsigned int sysctl_numa_balancing_scan_period_min;
extern unsigned int sysctl_numa_balancing_scan_period_max;
extern unsigned int sysctl_numa_balancing_scan_size;
extern unsigned int sysctl_numa_balancing_hot_threshold;
#endif
#ifdef CONFIG_SCHED_HRTICK
/*
* Use hrtick when:
* - enabled by features
* - hrtimer is actually high res
*/
static inline int hrtick_enabled(struct rq *rq)
{
if (!cpu_active(cpu_of(rq)))
return 0;
return hrtimer_is_hres_active(&rq->hrtick_timer);
}
static inline int hrtick_enabled_fair(struct rq *rq)
{
if (!sched_feat(HRTICK))
return 0;
return hrtick_enabled(rq);
}
static inline int hrtick_enabled_dl(struct rq *rq)
{
if (!sched_feat(HRTICK_DL))
return 0;
return hrtick_enabled(rq);
}
extern void hrtick_start(struct rq *rq, u64 delay);
#else /* !CONFIG_SCHED_HRTICK: */
static inline int hrtick_enabled_fair(struct rq *rq)
{
return 0;
}
static inline int hrtick_enabled_dl(struct rq *rq)
{
return 0;
}
static inline int hrtick_enabled(struct rq *rq)
{
return 0;
}
#endif /* !CONFIG_SCHED_HRTICK */
#ifndef arch_scale_freq_tick
static __always_inline void arch_scale_freq_tick(void) { }
#endif
#ifndef arch_scale_freq_capacity
/**
* arch_scale_freq_capacity - get the frequency scale factor of a given CPU.
* @cpu: the CPU in question.
*
* Return: the frequency scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
*
* f_curr
* ------ * SCHED_CAPACITY_SCALE
* f_max
*/
static __always_inline
unsigned long arch_scale_freq_capacity(int cpu)
{
return SCHED_CAPACITY_SCALE;
}
#endif
#ifdef CONFIG_SCHED_DEBUG
/*
* In double_lock_balance()/double_rq_lock(), we use raw_spin_rq_lock() to
* acquire rq lock instead of rq_lock(). So at the end of these two functions
* we need to call double_rq_clock_clear_update() to clear RQCF_UPDATED of
* rq->clock_update_flags to avoid the WARN_DOUBLE_CLOCK warning.
*/
static inline void double_rq_clock_clear_update(struct rq *rq1, struct rq *rq2)
{
rq1->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP);
/* rq1 == rq2 for !CONFIG_SMP, so just clear RQCF_UPDATED once. */
#ifdef CONFIG_SMP
rq2->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP);
#endif
}
#else
static inline void double_rq_clock_clear_update(struct rq *rq1, struct rq *rq2) { }
#endif
#define DEFINE_LOCK_GUARD_2(name, type, _lock, _unlock, ...) \
__DEFINE_UNLOCK_GUARD(name, type, _unlock, type *lock2; __VA_ARGS__) \
static inline class_##name##_t class_##name##_constructor(type *lock, type *lock2) \
{ class_##name##_t _t = { .lock = lock, .lock2 = lock2 }, *_T = &_t; \
_lock; return _t; }
#ifdef CONFIG_SMP
static inline bool rq_order_less(struct rq *rq1, struct rq *rq2)
{
#ifdef CONFIG_SCHED_CORE
/*
* In order to not have {0,2},{1,3} turn into into an AB-BA,
* order by core-id first and cpu-id second.
*
* Notably:
*
* double_rq_lock(0,3); will take core-0, core-1 lock
* double_rq_lock(1,2); will take core-1, core-0 lock
*
* when only cpu-id is considered.
*/
if (rq1->core->cpu < rq2->core->cpu)
return true;
if (rq1->core->cpu > rq2->core->cpu)
return false;
/*
* __sched_core_flip() relies on SMT having cpu-id lock order.
*/
#endif
return rq1->cpu < rq2->cpu;
}
extern void double_rq_lock(struct rq *rq1, struct rq *rq2);
#ifdef CONFIG_PREEMPTION
/*
* fair double_lock_balance: Safely acquires both rq->locks in a fair
* way at the expense of forcing extra atomic operations in all
* invocations. This assures that the double_lock is acquired using the
* same underlying policy as the spinlock_t on this architecture, which
* reduces latency compared to the unfair variant below. However, it
* also adds more overhead and therefore may reduce throughput.
*/
static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
__releases(this_rq->lock)
__acquires(busiest->lock)
__acquires(this_rq->lock)
{
raw_spin_rq_unlock(this_rq);
double_rq_lock(this_rq, busiest);
return 1;
}
#else /* !CONFIG_PREEMPTION: */
/*
* Unfair double_lock_balance: Optimizes throughput at the expense of
* latency by eliminating extra atomic operations when the locks are
* already in proper order on entry. This favors lower CPU-ids and will
* grant the double lock to lower CPUs over higher ids under contention,
* regardless of entry order into the function.
*/
static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
__releases(this_rq->lock)
__acquires(busiest->lock)
__acquires(this_rq->lock)
{
if (__rq_lockp(this_rq) == __rq_lockp(busiest) ||
likely(raw_spin_rq_trylock(busiest))) {
double_rq_clock_clear_update(this_rq, busiest);
return 0;
}
if (rq_order_less(this_rq, busiest)) {
raw_spin_rq_lock_nested(busiest, SINGLE_DEPTH_NESTING);
double_rq_clock_clear_update(this_rq, busiest);
return 0;
}
raw_spin_rq_unlock(this_rq);
double_rq_lock(this_rq, busiest);
return 1;
}
#endif /* !CONFIG_PREEMPTION */
/*
* double_lock_balance - lock the busiest runqueue, this_rq is locked already.
*/
static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest)
{
lockdep_assert_irqs_disabled();
return _double_lock_balance(this_rq, busiest);
}
static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
__releases(busiest->lock)
{
if (__rq_lockp(this_rq) != __rq_lockp(busiest))
raw_spin_rq_unlock(busiest);
lock_set_subclass(&__rq_lockp(this_rq)->dep_map, 0, _RET_IP_);
}
static inline void double_lock(spinlock_t *l1, spinlock_t *l2)
{
if (l1 > l2)
swap(l1, l2);
spin_lock(l1);
spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
}
static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2)
{
if (l1 > l2)
swap(l1, l2);
spin_lock_irq(l1);
spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
}
static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2)
{
if (l1 > l2)
swap(l1, l2);
raw_spin_lock(l1);
raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
}
static inline void double_raw_unlock(raw_spinlock_t *l1, raw_spinlock_t *l2)
{
raw_spin_unlock(l1);
raw_spin_unlock(l2);
}
DEFINE_LOCK_GUARD_2(double_raw_spinlock, raw_spinlock_t,
double_raw_lock(_T->lock, _T->lock2),
double_raw_unlock(_T->lock, _T->lock2))
/*
* double_rq_unlock - safely unlock two runqueues
*
* Note this does not restore interrupts like task_rq_unlock,
* you need to do so manually after calling.
*/
static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
__releases(rq1->lock)
__releases(rq2->lock)
{
if (__rq_lockp(rq1) != __rq_lockp(rq2))
raw_spin_rq_unlock(rq2);
else
__release(rq2->lock);
raw_spin_rq_unlock(rq1);
}
extern void set_rq_online (struct rq *rq);
extern void set_rq_offline(struct rq *rq);
extern bool sched_smp_initialized;
#else /* !CONFIG_SMP: */
/*
* double_rq_lock - safely lock two runqueues
*
* Note this does not disable interrupts like task_rq_lock,
* you need to do so manually before calling.
*/
static inline void double_rq_lock(struct rq *rq1, struct rq *rq2)
__acquires(rq1->lock)
__acquires(rq2->lock)
{
WARN_ON_ONCE(!irqs_disabled());
WARN_ON_ONCE(rq1 != rq2);
raw_spin_rq_lock(rq1);
__acquire(rq2->lock); /* Fake it out ;) */
double_rq_clock_clear_update(rq1, rq2);
}
/*
* double_rq_unlock - safely unlock two runqueues
*
* Note this does not restore interrupts like task_rq_unlock,
* you need to do so manually after calling.
*/
static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
__releases(rq1->lock)
__releases(rq2->lock)
{
WARN_ON_ONCE(rq1 != rq2);
raw_spin_rq_unlock(rq1);
__release(rq2->lock);
}
#endif /* !CONFIG_SMP */
DEFINE_LOCK_GUARD_2(double_rq_lock, struct rq,
double_rq_lock(_T->lock, _T->lock2),
double_rq_unlock(_T->lock, _T->lock2))
extern struct sched_entity *__pick_root_entity(struct cfs_rq *cfs_rq);
extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq);
extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq);
#ifdef CONFIG_SCHED_DEBUG
extern bool sched_debug_verbose;
extern void print_cfs_stats(struct seq_file *m, int cpu);
extern void print_rt_stats(struct seq_file *m, int cpu);
extern void print_dl_stats(struct seq_file *m, int cpu);
extern void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
extern void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq);
extern void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq);
extern void resched_latency_warn(int cpu, u64 latency);
# ifdef CONFIG_NUMA_BALANCING
extern void show_numa_stats(struct task_struct *p, struct seq_file *m);
extern void
print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
unsigned long tpf, unsigned long gsf, unsigned long gpf);
# endif /* CONFIG_NUMA_BALANCING */
#else /* !CONFIG_SCHED_DEBUG: */
static inline void resched_latency_warn(int cpu, u64 latency) { }
#endif /* !CONFIG_SCHED_DEBUG */
extern void init_cfs_rq(struct cfs_rq *cfs_rq);
extern void init_rt_rq(struct rt_rq *rt_rq);
extern void init_dl_rq(struct dl_rq *dl_rq);
extern void cfs_bandwidth_usage_inc(void);
extern void cfs_bandwidth_usage_dec(void);
#ifdef CONFIG_NO_HZ_COMMON
#define NOHZ_BALANCE_KICK_BIT 0
#define NOHZ_STATS_KICK_BIT 1
#define NOHZ_NEWILB_KICK_BIT 2
#define NOHZ_NEXT_KICK_BIT 3
/* Run sched_balance_domains() */
#define NOHZ_BALANCE_KICK BIT(NOHZ_BALANCE_KICK_BIT)
/* Update blocked load */
#define NOHZ_STATS_KICK BIT(NOHZ_STATS_KICK_BIT)
/* Update blocked load when entering idle */
#define NOHZ_NEWILB_KICK BIT(NOHZ_NEWILB_KICK_BIT)
/* Update nohz.next_balance */
#define NOHZ_NEXT_KICK BIT(NOHZ_NEXT_KICK_BIT)
#define NOHZ_KICK_MASK (NOHZ_BALANCE_KICK | NOHZ_STATS_KICK | NOHZ_NEXT_KICK)
#define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags)
extern void nohz_balance_exit_idle(struct rq *rq);
#else /* !CONFIG_NO_HZ_COMMON: */
static inline void nohz_balance_exit_idle(struct rq *rq) { }
#endif /* !CONFIG_NO_HZ_COMMON */
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
extern void nohz_run_idle_balance(int cpu);
#else
static inline void nohz_run_idle_balance(int cpu) { }
#endif
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
struct irqtime {
u64 total;
u64 tick_delta;
u64 irq_start_time;
struct u64_stats_sync sync;
};
DECLARE_PER_CPU(struct irqtime, cpu_irqtime);
/*
* Returns the irqtime minus the softirq time computed by ksoftirqd.
* Otherwise ksoftirqd's sum_exec_runtime is subtracted its own runtime
* and never move forward.
*/
static inline u64 irq_time_read(int cpu)
{
struct irqtime *irqtime = &per_cpu(cpu_irqtime, cpu);
unsigned int seq;
u64 total;
do {
seq = __u64_stats_fetch_begin(&irqtime->sync);
total = irqtime->total;
} while (__u64_stats_fetch_retry(&irqtime->sync, seq));
return total;
}
#endif /* CONFIG_IRQ_TIME_ACCOUNTING */
#ifdef CONFIG_CPU_FREQ
DECLARE_PER_CPU(struct update_util_data __rcu *, cpufreq_update_util_data);
/**
* cpufreq_update_util - Take a note about CPU utilization changes.
* @rq: Runqueue to carry out the update for.
* @flags: Update reason flags.
*
* This function is called by the scheduler on the CPU whose utilization is
* being updated.
*
* It can only be called from RCU-sched read-side critical sections.
*
* The way cpufreq is currently arranged requires it to evaluate the CPU
* performance state (frequency/voltage) on a regular basis to prevent it from
* being stuck in a completely inadequate performance level for too long.
* That is not guaranteed to happen if the updates are only triggered from CFS
* and DL, though, because they may not be coming in if only RT tasks are
* active all the time (or there are RT tasks only).
*
* As a workaround for that issue, this function is called periodically by the
* RT sched class to trigger extra cpufreq updates to prevent it from stalling,
* but that really is a band-aid. Going forward it should be replaced with
* solutions targeted more specifically at RT tasks.
*/
static inline void cpufreq_update_util(struct rq *rq, unsigned int flags)
{
struct update_util_data *data;
data = rcu_dereference_sched(*per_cpu_ptr(&cpufreq_update_util_data,
cpu_of(rq)));
if (data)
data->func(data, rq_clock(rq), flags);
}
#else /* !CONFIG_CPU_FREQ: */
static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) { }
#endif /* !CONFIG_CPU_FREQ */
#ifdef arch_scale_freq_capacity
# ifndef arch_scale_freq_invariant
# define arch_scale_freq_invariant() true
# endif
#else
# define arch_scale_freq_invariant() false
#endif
#ifdef CONFIG_SMP
bool update_other_load_avgs(struct rq *rq);
unsigned long effective_cpu_util(int cpu, unsigned long util_cfs,
unsigned long *min,
unsigned long *max);
unsigned long sugov_effective_cpu_perf(int cpu, unsigned long actual,
unsigned long min,
unsigned long max);
/*
* Verify the fitness of task @p to run on @cpu taking into account the
* CPU original capacity and the runtime/deadline ratio of the task.
*
* The function will return true if the original capacity of @cpu is
* greater than or equal to task's deadline density right shifted by
* (BW_SHIFT - SCHED_CAPACITY_SHIFT) and false otherwise.
*/
static inline bool dl_task_fits_capacity(struct task_struct *p, int cpu)
{
unsigned long cap = arch_scale_cpu_capacity(cpu);
return cap >= p->dl.dl_density >> (BW_SHIFT - SCHED_CAPACITY_SHIFT);
}
static inline unsigned long cpu_bw_dl(struct rq *rq)
{
return (rq->dl.running_bw * SCHED_CAPACITY_SCALE) >> BW_SHIFT;
}
static inline unsigned long cpu_util_dl(struct rq *rq)
{
return READ_ONCE(rq->avg_dl.util_avg);
}
extern unsigned long cpu_util_cfs(int cpu);
extern unsigned long cpu_util_cfs_boost(int cpu);
static inline unsigned long cpu_util_rt(struct rq *rq)
{
return READ_ONCE(rq->avg_rt.util_avg);
}
#else /* !CONFIG_SMP */
static inline bool update_other_load_avgs(struct rq *rq) { return false; }
#endif /* CONFIG_SMP */
#ifdef CONFIG_UCLAMP_TASK
unsigned long uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);
static inline unsigned long uclamp_rq_get(struct rq *rq,
enum uclamp_id clamp_id)
{
return READ_ONCE(rq->uclamp[clamp_id].value);
}
static inline void uclamp_rq_set(struct rq *rq, enum uclamp_id clamp_id,
unsigned int value)
{
WRITE_ONCE(rq->uclamp[clamp_id].value, value);
}
static inline bool uclamp_rq_is_idle(struct rq *rq)
{
return rq->uclamp_flags & UCLAMP_FLAG_IDLE;
}
/* Is the rq being capped/throttled by uclamp_max? */
static inline bool uclamp_rq_is_capped(struct rq *rq)
{
unsigned long rq_util;
unsigned long max_util;
if (!static_branch_likely(&sched_uclamp_used))
return false;
rq_util = cpu_util_cfs(cpu_of(rq)) + cpu_util_rt(rq);
max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value);
return max_util != SCHED_CAPACITY_SCALE && rq_util >= max_util;
}
/*
* When uclamp is compiled in, the aggregation at rq level is 'turned off'
* by default in the fast path and only gets turned on once userspace performs
* an operation that requires it.
*
* Returns true if userspace opted-in to use uclamp and aggregation at rq level
* hence is active.
*/
static inline bool uclamp_is_used(void)
{
return static_branch_likely(&sched_uclamp_used);
}
#define for_each_clamp_id(clamp_id) \
for ((clamp_id) = 0; (clamp_id) < UCLAMP_CNT; (clamp_id)++)
extern unsigned int sysctl_sched_uclamp_util_min_rt_default;
static inline unsigned int uclamp_none(enum uclamp_id clamp_id)
{
if (clamp_id == UCLAMP_MIN)
return 0;
return SCHED_CAPACITY_SCALE;
}
/* Integer rounded range for each bucket */
#define UCLAMP_BUCKET_DELTA DIV_ROUND_CLOSEST(SCHED_CAPACITY_SCALE, UCLAMP_BUCKETS)
static inline unsigned int uclamp_bucket_id(unsigned int clamp_value)
{
return min_t(unsigned int, clamp_value / UCLAMP_BUCKET_DELTA, UCLAMP_BUCKETS - 1);
}
static inline void
uclamp_se_set(struct uclamp_se *uc_se, unsigned int value, bool user_defined)
{
uc_se->value = value;
uc_se->bucket_id = uclamp_bucket_id(value);
uc_se->user_defined = user_defined;
}
#else /* !CONFIG_UCLAMP_TASK: */
static inline unsigned long
uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id)
{
if (clamp_id == UCLAMP_MIN)
return 0;
return SCHED_CAPACITY_SCALE;
}
static inline bool uclamp_rq_is_capped(struct rq *rq) { return false; }
static inline bool uclamp_is_used(void)
{
return false;
}
static inline unsigned long
uclamp_rq_get(struct rq *rq, enum uclamp_id clamp_id)
{
if (clamp_id == UCLAMP_MIN)
return 0;
return SCHED_CAPACITY_SCALE;
}
static inline void
uclamp_rq_set(struct rq *rq, enum uclamp_id clamp_id, unsigned int value)
{
}
static inline bool uclamp_rq_is_idle(struct rq *rq)
{
return false;
}
#endif /* !CONFIG_UCLAMP_TASK */
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
static inline unsigned long cpu_util_irq(struct rq *rq)
{
return READ_ONCE(rq->avg_irq.util_avg);
}
static inline
unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max)
{
util *= (max - irq);
util /= max;
return util;
}
#else /* !CONFIG_HAVE_SCHED_AVG_IRQ: */
static inline unsigned long cpu_util_irq(struct rq *rq)
{
return 0;
}
static inline
unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max)
{
return util;
}
#endif /* !CONFIG_HAVE_SCHED_AVG_IRQ */
#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
#define perf_domain_span(pd) (to_cpumask(((pd)->em_pd->cpus)))
DECLARE_STATIC_KEY_FALSE(sched_energy_present);
static inline bool sched_energy_enabled(void)
{
return static_branch_unlikely(&sched_energy_present);
}
extern struct cpufreq_governor schedutil_gov;
#else /* ! (CONFIG_ENERGY_MODEL && CONFIG_CPU_FREQ_GOV_SCHEDUTIL) */
#define perf_domain_span(pd) NULL
static inline bool sched_energy_enabled(void) { return false; }
#endif /* CONFIG_ENERGY_MODEL && CONFIG_CPU_FREQ_GOV_SCHEDUTIL */
#ifdef CONFIG_MEMBARRIER
/*
* The scheduler provides memory barriers required by membarrier between:
* - prior user-space memory accesses and store to rq->membarrier_state,
* - store to rq->membarrier_state and following user-space memory accesses.
* In the same way it provides those guarantees around store to rq->curr.
*/
static inline void membarrier_switch_mm(struct rq *rq,
struct mm_struct *prev_mm,
struct mm_struct *next_mm)
{
int membarrier_state;
if (prev_mm == next_mm)
return;
membarrier_state = atomic_read(&next_mm->membarrier_state);
if (READ_ONCE(rq->membarrier_state) == membarrier_state)
return;
WRITE_ONCE(rq->membarrier_state, membarrier_state);
}
#else /* !CONFIG_MEMBARRIER :*/
static inline void membarrier_switch_mm(struct rq *rq,
struct mm_struct *prev_mm,
struct mm_struct *next_mm)
{
}
#endif /* !CONFIG_MEMBARRIER */
#ifdef CONFIG_SMP
static inline bool is_per_cpu_kthread(struct task_struct *p)
{
if (!(p->flags & PF_KTHREAD))
return false;
if (p->nr_cpus_allowed != 1)
return false;
return true;
}
#endif
extern void swake_up_all_locked(struct swait_queue_head *q);
extern void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);
extern int try_to_wake_up(struct task_struct *tsk, unsigned int state, int wake_flags);
#ifdef CONFIG_PREEMPT_DYNAMIC
extern int preempt_dynamic_mode;
extern int sched_dynamic_mode(const char *str);
extern void sched_dynamic_update(int mode);
#endif
#ifdef CONFIG_SCHED_MM_CID
#define SCHED_MM_CID_PERIOD_NS (100ULL * 1000000) /* 100ms */
#define MM_CID_SCAN_DELAY 100 /* 100ms */
extern raw_spinlock_t cid_lock;
extern int use_cid_lock;
extern void sched_mm_cid_migrate_from(struct task_struct *t);
extern void sched_mm_cid_migrate_to(struct rq *dst_rq, struct task_struct *t);
extern void task_tick_mm_cid(struct rq *rq, struct task_struct *curr);
extern void init_sched_mm_cid(struct task_struct *t);
static inline void __mm_cid_put(struct mm_struct *mm, int cid)
{
if (cid < 0)
return;
cpumask_clear_cpu(cid, mm_cidmask(mm));
}
/*
* The per-mm/cpu cid can have the MM_CID_LAZY_PUT flag set or transition to
* the MM_CID_UNSET state without holding the rq lock, but the rq lock needs to
* be held to transition to other states.
*
* State transitions synchronized with cmpxchg or try_cmpxchg need to be
* consistent across CPUs, which prevents use of this_cpu_cmpxchg.
*/
static inline void mm_cid_put_lazy(struct task_struct *t)
{
struct mm_struct *mm = t->mm;
struct mm_cid __percpu *pcpu_cid = mm->pcpu_cid;
int cid;
lockdep_assert_irqs_disabled();
cid = __this_cpu_read(pcpu_cid->cid);
if (!mm_cid_is_lazy_put(cid) ||
!try_cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, &cid, MM_CID_UNSET))
return;
__mm_cid_put(mm, mm_cid_clear_lazy_put(cid));
}
static inline int mm_cid_pcpu_unset(struct mm_struct *mm)
{
struct mm_cid __percpu *pcpu_cid = mm->pcpu_cid;
int cid, res;
lockdep_assert_irqs_disabled();
cid = __this_cpu_read(pcpu_cid->cid);
for (;;) {
if (mm_cid_is_unset(cid))
return MM_CID_UNSET;
/*
* Attempt transition from valid or lazy-put to unset.
*/
res = cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, cid, MM_CID_UNSET);
if (res == cid)
break;
cid = res;
}
return cid;
}
static inline void mm_cid_put(struct mm_struct *mm)
{
int cid;
lockdep_assert_irqs_disabled();
cid = mm_cid_pcpu_unset(mm);
if (cid == MM_CID_UNSET)
return;
__mm_cid_put(mm, mm_cid_clear_lazy_put(cid));
}
static inline int __mm_cid_try_get(struct mm_struct *mm)
{
struct cpumask *cpumask;
int cid;
cpumask = mm_cidmask(mm);
/*
* Retry finding first zero bit if the mask is temporarily
* filled. This only happens during concurrent remote-clear
* which owns a cid without holding a rq lock.
*/
for (;;) {
cid = cpumask_first_zero(cpumask);
if (cid < nr_cpu_ids)
break;
cpu_relax();
}
if (cpumask_test_and_set_cpu(cid, cpumask))
return -1;
return cid;
}
/*
* Save a snapshot of the current runqueue time of this cpu
* with the per-cpu cid value, allowing to estimate how recently it was used.
*/
static inline void mm_cid_snapshot_time(struct rq *rq, struct mm_struct *mm)
{
struct mm_cid *pcpu_cid = per_cpu_ptr(mm->pcpu_cid, cpu_of(rq));
lockdep_assert_rq_held(rq);
WRITE_ONCE(pcpu_cid->time, rq->clock);
}
static inline int __mm_cid_get(struct rq *rq, struct mm_struct *mm)
{
int cid;
/*
* All allocations (even those using the cid_lock) are lock-free. If
* use_cid_lock is set, hold the cid_lock to perform cid allocation to
* guarantee forward progress.
*/
if (!READ_ONCE(use_cid_lock)) {
cid = __mm_cid_try_get(mm);
if (cid >= 0)
goto end;
raw_spin_lock(&cid_lock);
} else {
raw_spin_lock(&cid_lock);
cid = __mm_cid_try_get(mm);
if (cid >= 0)
goto unlock;
}
/*
* cid concurrently allocated. Retry while forcing following
* allocations to use the cid_lock to ensure forward progress.
*/
WRITE_ONCE(use_cid_lock, 1);
/*
* Set use_cid_lock before allocation. Only care about program order
* because this is only required for forward progress.
*/
barrier();
/*
* Retry until it succeeds. It is guaranteed to eventually succeed once
* all newcoming allocations observe the use_cid_lock flag set.
*/
do {
cid = __mm_cid_try_get(mm);
cpu_relax();
} while (cid < 0);
/*
* Allocate before clearing use_cid_lock. Only care about
* program order because this is for forward progress.
*/
barrier();
WRITE_ONCE(use_cid_lock, 0);
unlock:
raw_spin_unlock(&cid_lock);
end:
mm_cid_snapshot_time(rq, mm);
return cid;
}
static inline int mm_cid_get(struct rq *rq, struct mm_struct *mm)
{
struct mm_cid __percpu *pcpu_cid = mm->pcpu_cid;
struct cpumask *cpumask;
int cid;
lockdep_assert_rq_held(rq);
cpumask = mm_cidmask(mm);
cid = __this_cpu_read(pcpu_cid->cid);
if (mm_cid_is_valid(cid)) {
mm_cid_snapshot_time(rq, mm);
return cid;
}
if (mm_cid_is_lazy_put(cid)) {
if (try_cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, &cid, MM_CID_UNSET))
__mm_cid_put(mm, mm_cid_clear_lazy_put(cid));
}
cid = __mm_cid_get(rq, mm);
__this_cpu_write(pcpu_cid->cid, cid);
return cid;
}
static inline void switch_mm_cid(struct rq *rq,
struct task_struct *prev,
struct task_struct *next)
{
/*
* Provide a memory barrier between rq->curr store and load of
* {prev,next}->mm->pcpu_cid[cpu] on rq->curr->mm transition.
*
* Should be adapted if context_switch() is modified.
*/
if (!next->mm) { // to kernel
/*
* user -> kernel transition does not guarantee a barrier, but
* we can use the fact that it performs an atomic operation in
* mmgrab().
*/
if (prev->mm) // from user
smp_mb__after_mmgrab();
/*
* kernel -> kernel transition does not change rq->curr->mm
* state. It stays NULL.
*/
} else { // to user
/*
* kernel -> user transition does not provide a barrier
* between rq->curr store and load of {prev,next}->mm->pcpu_cid[cpu].
* Provide it here.
*/
if (!prev->mm) { // from kernel
smp_mb();
} else { // from user
/*
* user->user transition relies on an implicit
* memory barrier in switch_mm() when
* current->mm changes. If the architecture
* switch_mm() does not have an implicit memory
* barrier, it is emitted here. If current->mm
* is unchanged, no barrier is needed.
*/
smp_mb__after_switch_mm();
}
}
if (prev->mm_cid_active) {
mm_cid_snapshot_time(rq, prev->mm);
mm_cid_put_lazy(prev);
prev->mm_cid = -1;
}
if (next->mm_cid_active)
next->last_mm_cid = next->mm_cid = mm_cid_get(rq, next->mm);
}
#else /* !CONFIG_SCHED_MM_CID: */
static inline void switch_mm_cid(struct rq *rq, struct task_struct *prev, struct task_struct *next) { }
static inline void sched_mm_cid_migrate_from(struct task_struct *t) { }
static inline void sched_mm_cid_migrate_to(struct rq *dst_rq, struct task_struct *t) { }
static inline void task_tick_mm_cid(struct rq *rq, struct task_struct *curr) { }
static inline void init_sched_mm_cid(struct task_struct *t) { }
#endif /* !CONFIG_SCHED_MM_CID */
extern u64 avg_vruntime(struct cfs_rq *cfs_rq);
extern int entity_eligible(struct cfs_rq *cfs_rq, struct sched_entity *se);
#ifdef CONFIG_RT_MUTEXES
static inline int __rt_effective_prio(struct task_struct *pi_task, int prio)
{
if (pi_task)
prio = min(prio, pi_task->prio);
return prio;
}
static inline int rt_effective_prio(struct task_struct *p, int prio)
{
struct task_struct *pi_task = rt_mutex_get_top_task(p);
return __rt_effective_prio(pi_task, prio);
}
#else /* !CONFIG_RT_MUTEXES: */
static inline int rt_effective_prio(struct task_struct *p, int prio)
{
return prio;
}
#endif /* !CONFIG_RT_MUTEXES */
extern int __sched_setscheduler(struct task_struct *p, const struct sched_attr *attr, bool user, bool pi);
extern int __sched_setaffinity(struct task_struct *p, struct affinity_context *ctx);
extern void __setscheduler_prio(struct task_struct *p, int prio);
extern void set_load_weight(struct task_struct *p, bool update_load);
extern void enqueue_task(struct rq *rq, struct task_struct *p, int flags);
extern void dequeue_task(struct rq *rq, struct task_struct *p, int flags);
extern void check_class_changing(struct rq *rq, struct task_struct *p,
const struct sched_class *prev_class);
extern void check_class_changed(struct rq *rq, struct task_struct *p,
const struct sched_class *prev_class,
int oldprio);
#ifdef CONFIG_SMP
extern struct balance_callback *splice_balance_callbacks(struct rq *rq);
extern void balance_callbacks(struct rq *rq, struct balance_callback *head);
#else
static inline struct balance_callback *splice_balance_callbacks(struct rq *rq)
{
return NULL;
}
static inline void balance_callbacks(struct rq *rq, struct balance_callback *head)
{
}
#endif
#include "ext.h"
#endif /* _KERNEL_SCHED_SCHED_H */
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