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sched: Implement demand based update_cfs_load()

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When the system is busy, dilation of rq->next_balance makes lb->update_shares()
insufficiently frequent for threads which don't sleep (no dequeue/enqueue
updates).  Adjust for this by making demand based updates based on the
accumulation of execution time sufficient to wrap our averaging window.

Signed-off-by: Paul Turner <pjt@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20101115234938.291159744@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul Turner
2010-11-15 15:47:08 -08:00
committed by Ingo Molnar
parent c66eaf619c
commit 3b3d190ec3
2 changed files with 20 additions and 1 deletions
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9
kernel/sched.c
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@ -353,9 +353,16 @@ struct cfs_rq {
*/
unsigned long h_load;
/*
* Maintaining per-cpu shares distribution for group scheduling
*
* load_stamp is the last time we updated the load average
* load_last is the last time we updated the load average and saw load
* load_unacc_exec_time is currently unaccounted execution time
*/
u64 load_avg;
u64 load_period;
u64 load_stamp, load_last;
u64 load_stamp, load_last, load_unacc_exec_time;
unsigned long load_contribution;
#endif