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| author | Josh Don <joshdon@google.com> | 2020-08-04 12:34:13 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-08-26 12:41:57 +0200 |
| commit | ec73240b1627cddfd7cef018c7fa1c32e64a721e (patch) | |
| tree | fdcf9003dc2ac365106fcd36c1a0dfff13e32254 /kernel/sched/fair.c | |
| parent | 5f4a1c4ea44728aa80be21dbf3a0469b5ca81d88 (diff) | |
| download | lwn-ec73240b1627cddfd7cef018c7fa1c32e64a721e.tar.gz lwn-ec73240b1627cddfd7cef018c7fa1c32e64a721e.zip | |
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
Diffstat (limited to 'kernel/sched/fair.c')
| -rw-r--r-- | kernel/sched/fair.c | 4 |
1 files changed, 4 insertions, 0 deletions
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: */ |