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sched: Introduce temporary FAIR_GROUP_SCHED dependency for load-tracking

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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>
This commit is contained in:
Paul Turner 2012-10-04 13:18:32 +02:00 • committed by Ingo Molnar
commit f4e26b120b
4 changed files with 32 additions and 5 deletions
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8
include/linux/sched.h
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@ -1168,7 +1168,13 @@ struct sched_entity {
/* rq "owned" by this entity/group: */
struct cfs_rq *my_q;
#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).
*/
#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
/* Per-entity load-tracking */
struct sched_avg avg;
#endif
};