TononixOS/ubports_kernel_google_msm
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

sched: Fix update_cfs_load() synchronization

Browse Source 
Using cfs_rq->nr_running is not sufficient to synchronize update_cfs_load with
the put path since nr_running accounting occurs at deactivation.

It's also not safe to make the removal decision based on load_avg as this fails
with both high periods and low shares.  Resolve this by clipping history after
4 periods without activity.

Note: the above will always occur from update_shares() since in the
last-task-sleep-case that task will still be cfs_rq->curr when update_cfs_load
is called.

Signed-off-by: Paul Turner <pjt@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20101115234937.933428187@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul Turner
2010-11-15 15:47:04 -08:00
committed by Ingo Molnar
parent f0d7442a59
commit e33078baa4
2 changed files with 22 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/sched.c
View File

@@ -355,7 +355,7 @@ struct cfs_rq {
u64 load_avg;
u64 load_period;
u64 load_stamp;
u64 load_stamp, load_last;
unsigned long load_contribution;
#endif