diff options
| author | Nikhil Rao <ncrao@google.com> | 2011-02-10 10:23:25 +0100 |
|---|---|---|
| committer | AK <andi@firstfloor.org> | 2011-03-31 11:57:58 -0700 |
| commit | 1f8e01cc3447bb1c18014be7de43e1fef344e0c1 (patch) | |
| tree | ee0f43587926915bb1e9861930102f6ed989e50f /kernel | |
| parent | 279d138207ac3273bd233f75aba8eb49b2f1bc0f (diff) | |
sched: Do not consider SCHED_IDLE tasks to be cache hot
Commit: ef8002f6848236de5adc613063ebeabddea8a6fb upstream
This patch adds a check in task_hot to return if the task has SCHED_IDLE
policy. SCHED_IDLE tasks have very low weight, and when run with regular
workloads, are typically scheduled many milliseconds apart. There is no
need to consider these tasks hot for load balancing.
Signed-off-by: Nikhil Rao <ncrao@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
LKML-Reference: <1287173550-30365-2-git-send-email-ncrao@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 1747071e26f..5ea39ade3ad 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1972,6 +1972,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd) if (p->sched_class != &fair_sched_class) return 0; + if (unlikely(p->policy == SCHED_IDLE)) + return 0; + /* * Buddy candidates are cache hot: */ |