diff options
| 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/sched.h | |
| parent | sched: Make __update_entity_runnable_avg() fast (diff) | |
| download | linux-f4e26b120b9de84cb627bc7361ba43cfdc51341f.tar.xz linux-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/sched.h')
| -rw-r--r-- | kernel/sched/sched.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 0a75a430ca77..5eca173b563f 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -225,6 +225,12 @@ struct cfs_rq { #endif #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). + */ +#ifdef CONFIG_FAIR_GROUP_SCHED /* * CFS Load tracking * Under CFS, load is tracked on a per-entity basis and aggregated up. @@ -234,7 +240,8 @@ struct cfs_rq { u64 runnable_load_avg, blocked_load_avg; atomic64_t decay_counter, removed_load; u64 last_decay; - +#endif /* CONFIG_FAIR_GROUP_SCHED */ +/* These always depend on CONFIG_FAIR_GROUP_SCHED */ #ifdef CONFIG_FAIR_GROUP_SCHED u32 tg_runnable_contrib; u64 tg_load_contrib; |