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| author | Paul Turner <pjt@google.com> | 2012-10-04 13:18:32 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-10-24 10:27:31 +0200 |
| commit | f4e26b120b9de84cb627bc7361ba43cfdc51341f (patch) | |
| tree | 19786e34c5de3c9b7c9c871a27b0f8d85cc8690d /kernel/sched/core.c | |
| parent | 5b51f2f80b3b906ce59bd4dce6eca3c7f34cb1b9 (diff) | |
| download | lwn-f4e26b120b9de84cb627bc7361ba43cfdc51341f.tar.gz lwn-f4e26b120b9de84cb627bc7361ba43cfdc51341f.zip | |
sched: Introduce temporary FAIR_GROUP_SCHED dependency for load-tracking
While per-entity load-tracking is generally useful, beyond computing shares
distribution, e.g. runnable based load-balance (in progress), governors,
power-management, etc.
These facilities are not yet consumers of this data. This may be trivially
reverted when the information is required; but avoid paying the overhead for
calculations we will not use until then.
Signed-off-by: Paul Turner <pjt@google.com>
Reviewed-by: Ben Segall <bsegall@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120823141507.422162369@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index f26860074ef2..5dae0d252ff7 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1526,7 +1526,12 @@ static void __sched_fork(struct task_struct *p) p->se.vruntime = 0; INIT_LIST_HEAD(&p->se.group_node); -#ifdef CONFIG_SMP +/* + * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be + * removed when useful for applications beyond shares distribution (e.g. + * load-balance). + */ +#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED) p->se.avg.runnable_avg_period = 0; p->se.avg.runnable_avg_sum = 0; #endif |