The following commit has been merged into the sched/core branch of tip: Commit-ID: ec73240b1627cddfd7cef018c7fa1c32e64a721e Gitweb: https://git.kernel.org/tip/ec73240b1627cddfd7cef018c7fa1c32e64a721e Author: Josh Don <joshdon@xxxxxxxxxx> AuthorDate: Tue, 04 Aug 2020 12:34:13 -07:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Wed, 26 Aug 2020 12:41:57 +02:00 sched/fair: Ignore cache hotness for SMT migration SMT siblings share caches, so cache hotness should be irrelevant for cross-sibling migration. Signed-off-by: Josh Don <joshdon@xxxxxxxxxx> Proposed-by: Venkatesh Pallipadi <venki@xxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Link: https://lkml.kernel.org/r/20200804193413.510651-1-joshdon@xxxxxxxxxx --- kernel/sched/fair.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 1a68a05..abdb54e 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7402,6 +7402,10 @@ static int task_hot(struct task_struct *p, struct lb_env *env) if (unlikely(task_has_idle_policy(p))) return 0; + /* SMT siblings share cache */ + if (env->sd->flags & SD_SHARE_CPUCAPACITY) + return 0; + /* * Buddy candidates are cache hot: */
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