Messages in this thread Patch in this message | | | Date | Tue, 4 Aug 2020 12:34:13 -0700 | Subject | [PATCH v2] sched/fair: ignore cache hotness for SMT migration | From | Josh Don <> |
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SMT siblings share caches, so cache hotness should be irrelevant for cross-sibling migration.
Proposed-by: Venkatesh Pallipadi <venki@google.com> Signed-off-by: Josh Don <joshdon@google.com> --- kernel/sched/fair.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 1a68a0536add..abdb54e2339f 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: */ -- 2.28.0.163.g6104cc2f0b6-goog
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