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ANDROID: vendor_hooks: add two hooks for lazy preemption

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add some changes to achieve the lazy preemption feature in our baseline.
- android_vh_read_lazy_flag
- android_vh_set_tsk_need_resched_lazy
Bug: 336982374

Change-Id: I297192a3276bcb18663f5e6ffbb084ec8a8eef7a
Signed-off-by: xieliujie <xieliujie@oppo.com>
This commit is contained in:
xieliujie 2024-06-06 10:52:37 +08:00 committed by Treehugger Robot
parent 858a548331
commit 3f6eaa6a3c
4 changed files with 21 additions and 2 deletions
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7
arch/arm64/kernel/signal.c
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@ -20,6 +20,8 @@
#include <linux/ratelimit.h>
#include <linux/syscalls.h>
#include <trace/hooks/dtask.h>
#include <asm/daifflags.h>
#include <asm/debug-monitors.h>
#include <asm/elf.h>
@ -1280,8 +1282,11 @@ static void do_signal(struct pt_regs *regs)
void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags)
{
int thread_lazy_flag = 0;
do {
if (thread_flags & _TIF_NEED_RESCHED) {
trace_android_vh_read_lazy_flag(&thread_lazy_flag, &thread_flags);
if ((thread_flags & _TIF_NEED_RESCHED) || thread_lazy_flag) {
/* Unmask Debug and SError for the next task */
local_daif_restore(DAIF_PROCCTX_NOIRQ);

2
drivers/android/vendor_hooks.c
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@ -400,3 +400,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_madvise_cold_pageout_skip);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_psi_event);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_psi_group);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mmc_sdio_pm_flag_set);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_read_lazy_flag);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_set_tsk_need_resched_lazy);

8
include/trace/hooks/dtask.h
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@ -132,6 +132,14 @@ DECLARE_HOOK(android_vh_record_rwsem_lock_starttime,
DECLARE_HOOK(android_vh_record_pcpu_rwsem_starttime,
TP_PROTO(struct percpu_rw_semaphore *sem, unsigned long settime_jiffies),
TP_ARGS(sem, settime_jiffies));
DECLARE_HOOK(android_vh_read_lazy_flag,
TP_PROTO(int *thread_lazy_flag, unsigned long *thread_flags),
TP_ARGS(thread_lazy_flag, thread_flags));
DECLARE_HOOK(android_vh_set_tsk_need_resched_lazy,
TP_PROTO(struct task_struct *p, struct rq *rq, int *need_lazy),
TP_ARGS(p, rq, need_lazy));
#endif /* _TRACE_HOOK_DTASK_H */
/* This part must be outside protection */

6
kernel/sched/core.c
View File

@ -1065,13 +1065,17 @@ void wake_up_q(struct wake_q_head *head)
void resched_curr(struct rq *rq)
{
struct task_struct *curr = rq->curr;
int cpu;
int cpu, need_lazy = 0;
lockdep_assert_rq_held(rq);
if (test_tsk_need_resched(curr))
return;
trace_android_vh_set_tsk_need_resched_lazy(curr, rq, &need_lazy);
if (need_lazy)
return;
cpu = cpu_of(rq);
if (cpu == smp_processor_id()) {