Commit ec73240b authored Aug 04, 2020 by Josh Don Committed by Peter Zijlstra Aug 26, 2020

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@google.com>
Proposed-by: Venkatesh Pallipadi <venki@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200804193413.510651-1-joshdon@google.com

parent 5f4a1c4e

kernel/sched/fair.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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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