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cgroup/cpuset: move memory_spread to cpuset-v1.c

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'memory_spread' is only set in cpuset v1. move corresponding code into
cpuset-v1.c.

Currently, 'cpuset_update_task_spread_flags' and 'update_tasks_flags' are
exposed to cpuset.c.

Signed-off-by: Chen Ridong <chenridong@huawei.com>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Chen Ridong 2024-08-30 10:02:22 +00:00 committed by Tejun Heo
parent 047b830974
commit 90eec9548d
3 changed files with 45 additions and 42 deletions
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3
kernel/cgroup/cpuset-internal.h
View File

@ -248,5 +248,8 @@ int fmeter_getrate(struct fmeter *fmp);
int cpuset_write_s64(struct cgroup_subsys_state *css, struct cftype *cft,
s64 val);
s64 cpuset_read_s64(struct cgroup_subsys_state *css, struct cftype *cft);
void cpuset_update_task_spread_flags(struct cpuset *cs,
struct task_struct *tsk);
void update_tasks_flags(struct cpuset *cs);
#endif /* __CPUSET_INTERNAL_H */

42
kernel/cgroup/cpuset-v1.c
View File

@ -194,3 +194,45 @@ s64 cpuset_read_s64(struct cgroup_subsys_state *css, struct cftype *cft)
/* Unreachable but makes gcc happy */
return 0;
}
/*
* update task's spread flag if cpuset's page/slab spread flag is set
*
* Call with callback_lock or cpuset_mutex held. The check can be skipped
* if on default hierarchy.
*/
void cpuset_update_task_spread_flags(struct cpuset *cs,
struct task_struct *tsk)
{
if (cgroup_subsys_on_dfl(cpuset_cgrp_subsys))
return;
if (is_spread_page(cs))
task_set_spread_page(tsk);
else
task_clear_spread_page(tsk);
if (is_spread_slab(cs))
task_set_spread_slab(tsk);
else
task_clear_spread_slab(tsk);
}
/**
* update_tasks_flags - update the spread flags of tasks in the cpuset.
* @cs: the cpuset in which each task's spread flags needs to be changed
*
* Iterate through each task of @cs updating its spread flags. As this
* function is called with cpuset_mutex held, cpuset membership stays
* stable.
*/
void update_tasks_flags(struct cpuset *cs)
{
struct css_task_iter it;
struct task_struct *task;
css_task_iter_start(&cs->css, 0, &it);
while ((task = css_task_iter_next(&it)))
cpuset_update_task_spread_flags(cs, task);
css_task_iter_end(&it);
}

42
kernel/cgroup/cpuset.c
View File

@ -407,29 +407,6 @@ static void guarantee_online_mems(struct cpuset *cs, nodemask_t *pmask)
nodes_and(*pmask, cs->effective_mems, node_states[N_MEMORY]);
}
/*
* update task's spread flag if cpuset's page/slab spread flag is set
*
* Call with callback_lock or cpuset_mutex held. The check can be skipped
* if on default hierarchy.
*/
static void cpuset_update_task_spread_flags(struct cpuset *cs,
struct task_struct *tsk)
{
if (cgroup_subsys_on_dfl(cpuset_cgrp_subsys))
return;
if (is_spread_page(cs))
task_set_spread_page(tsk);
else
task_clear_spread_page(tsk);
if (is_spread_slab(cs))
task_set_spread_slab(tsk);
else
task_clear_spread_slab(tsk);
}
/*
* is_cpuset_subset(p, q) - Is cpuset p a subset of cpuset q?
*
@ -2794,25 +2771,6 @@ bool current_cpuset_is_being_rebound(void)
return ret;
}
/**
* update_tasks_flags - update the spread flags of tasks in the cpuset.
* @cs: the cpuset in which each task's spread flags needs to be changed
*
* Iterate through each task of @cs updating its spread flags. As this
* function is called with cpuset_mutex held, cpuset membership stays
* stable.
*/
static void update_tasks_flags(struct cpuset *cs)
{
struct css_task_iter it;
struct task_struct *task;
css_task_iter_start(&cs->css, 0, &it);
while ((task = css_task_iter_next(&it)))
cpuset_update_task_spread_flags(cs, task);
css_task_iter_end(&it);
}
/*
* update_flag - read a 0 or a 1 in a file and update associated flag
* bit: the bit to update (see cpuset_flagbits_t)