Messages in this thread Patch in this message | | | Date | Mon, 10 Jul 2023 08:13:43 -0000 | From | "tip-bot2 for Miaohe Lin" <> | Subject | [tip: sched/urgent] sched/fair: Use recent_used_cpu to test p->cpus_ptr |
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The following commit has been merged into the sched/urgent branch of tip:
Commit-ID: ae2ad293d6be143ad223f5f947cca07bcbe42595 Gitweb: https://git.kernel.org/tip/ae2ad293d6be143ad223f5f947cca07bcbe42595 Author: Miaohe Lin <linmiaohe@huawei.com> AuthorDate: Tue, 20 Jun 2023 16:07:47 +08:00 Committer: Peter Zijlstra <peterz@infradead.org> CommitterDate: Mon, 10 Jul 2023 09:52:30 +02:00
sched/fair: Use recent_used_cpu to test p->cpus_ptr
When checking whether a recently used CPU can be a potential idle candidate, recent_used_cpu should be used to test p->cpus_ptr as p->recent_used_cpu is not equal to recent_used_cpu and candidate decision is made based on recent_used_cpu here.
Fixes: 89aafd67f28c ("sched/fair: Use prev instead of new target as recent_used_cpu") Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Phil Auld <pauld@redhat.com> Acked-by: Mel Gorman <mgorman@suse.de> Link: https://lore.kernel.org/r/20230620080747.359122-1-linmiaohe@huawei.com --- kernel/sched/fair.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index a80a739..b3e25be 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7174,7 +7174,7 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target) recent_used_cpu != target && cpus_share_cache(recent_used_cpu, target) && (available_idle_cpu(recent_used_cpu) || sched_idle_cpu(recent_used_cpu)) && - cpumask_test_cpu(p->recent_used_cpu, p->cpus_ptr) && + cpumask_test_cpu(recent_used_cpu, p->cpus_ptr) && asym_fits_cpu(task_util, util_min, util_max, recent_used_cpu)) { return recent_used_cpu; }
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