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cgroup/cpuset: Skip spread flags update on v2

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[ Upstream commit 18f9a4d47527772515ad6cbdac796422566e6440 ]

Cpuset v2 has no spread flags to set. So we can skip spread
flags update if cpuset v2 is being used. Also change the name to
cpuset_update_task_spread_flags() to indicate that there are multiple
spread flags.

Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Stable-dep-of: 42a11bf5c543 ("cgroup/cpuset: Make cpuset_fork() handle CLONE_INTO_CGROUP properly")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Waiman Long 2022-11-12 17:19:38 -05:00 committed by Greg Kroah-Hartman
parent 1058e9a130
commit ff5a4fe259
1 changed files with 8 additions and 4 deletions
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12
kernel/cgroup/cpuset.c
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@ -550,11 +550,15 @@ static void guarantee_online_mems(struct cpuset *cs, nodemask_t *pmask)
/* /*
* update task's spread flag if cpuset's page/slab spread flag is set * update task's spread flag if cpuset's page/slab spread flag is set
* *
* Call with callback_lock or cpuset_rwsem held. * Call with callback_lock or cpuset_rwsem held. The check can be skipped
* if on default hierarchy.
*/ */
static void cpuset_update_task_spread_flag(struct cpuset *cs, static void cpuset_update_task_spread_flags(struct cpuset *cs,
struct task_struct *tsk) struct task_struct *tsk)
{ {
if (cgroup_subsys_on_dfl(cpuset_cgrp_subsys))
return;
if (is_spread_page(cs)) if (is_spread_page(cs))
task_set_spread_page(tsk); task_set_spread_page(tsk);
else else
@ -2165,7 +2169,7 @@ static void update_tasks_flags(struct cpuset *cs)
css_task_iter_start(&cs->css, 0, &it); css_task_iter_start(&cs->css, 0, &it);
while ((task = css_task_iter_next(&it))) while ((task = css_task_iter_next(&it)))
cpuset_update_task_spread_flag(cs, task); cpuset_update_task_spread_flags(cs, task);
css_task_iter_end(&it); css_task_iter_end(&it);
} }
@ -2547,7 +2551,7 @@ static void cpuset_attach(struct cgroup_taskset *tset)
WARN_ON_ONCE(set_cpus_allowed_ptr(task, cpus_attach)); WARN_ON_ONCE(set_cpus_allowed_ptr(task, cpus_attach));
cpuset_change_task_nodemask(task, &cpuset_attach_nodemask_to); cpuset_change_task_nodemask(task, &cpuset_attach_nodemask_to);
cpuset_update_task_spread_flag(cs, task); cpuset_update_task_spread_flags(cs, task);
} }
/* /*