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sched: Use rq->clock_task instead of rq->clock for correctly maintaining load averages 

The delta in clock_task is a more fair attribution of how much time a tg has
been contributing load to the current cpu.

While not really important it also means we're more in sync (by magnitude)
with respect to periodic updates (since __update_curr deltas are clock_task
based).

Signed-off-by: Paul Turner <pjt@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20110122044852.007092349@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul Turner 2011-01-21 20:45:02 -08:00 committed by Ingo Molnar
parent b815f1963e
commit 05ca62c6ca
1 changed files with 1 additions and 1 deletions
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2
kernel/sched_fair.c
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@ -725,7 +725,7 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
if (cfs_rq->tg == &root_task_group)
return;
now = rq_of(cfs_rq)->clock;
now = rq_of(cfs_rq)->clock_task;
delta = now - cfs_rq->load_stamp;
/* truncate load history at 4 idle periods */