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FROMGIT: cgroup/cpuset: Iterate only if DEADLINE tasks are present

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update_tasks_root_domain currently iterates over all tasks even if no
DEADLINE task is present on the cpuset/root domain for which bandwidth
accounting is being rebuilt. This has been reported to introduce 10+ ms
delays on suspend-resume operations.

Skip the costly iteration for cpusets that don't contain DEADLINE tasks.

Bug: 238390134
Reported-by: Qais Yousef <qyousef@layalina.io>
Link: https://lore.kernel.org/lkml/20230206221428.2125324-1-qyousef@layalina.io/
Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
(cherry picked from commit c0f78fd5ed
https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git cgroup/for-6.5)
Signed-off-by: Qais Yousef <qyousef@google.com>
Change-Id: Idc3f348d90b1024be2408fe8a855e09c354409c8
This commit is contained in:
Juri Lelli
2023-05-08 09:58:52 +02:00
committed by Greg Kroah-Hartman
parent 16a812c05e
commit 71cf567de1
1 changed files with 3 additions and 0 deletions
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3
kernel/cgroup/cpuset.c
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@@ -978,6 +978,9 @@ static void dl_update_tasks_root_domain(struct cpuset *cs)
struct css_task_iter it;
struct task_struct *task;
if (cs->nr_deadline_tasks == 0)
return;
css_task_iter_start(&cs->css, 0, &it);
while ((task = css_task_iter_next(&it)))