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sched/fair: Ignore cache hotness for SMT migration

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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
This commit is contained in:
Josh Don
2020-08-04 12:34:13 -07:00
committed by Peter Zijlstra
parent 5f4a1c4ea4
commit ec73240b16
1 changed files with 4 additions and 0 deletions
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4
kernel/sched/fair.c
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@@ -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:
*/