From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Josh Don Date: Tue, 4 Aug 2020 12:34:13 -0700 Subject: [PATCH] sched/fair: Ignore cache hotness for SMT migration commit ec73240b1627cddfd7cef018c7fa1c32e64a721e upstream SMT siblings share caches, so cache hotness should be irrelevant for cross-sibling migration. Signed-off-by: Josh Don Proposed-by: Venkatesh Pallipadi Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20200804193413.510651-1-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 c0c4d9ad7da8..1c39dda88136 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7405,6 +7405,10 @@ 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: */ -- https://clearlinux.org