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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-10-17 13:27:02 -0400
committerIngo Molnar <mingo@elte.hu>2008-10-20 08:05:02 -0400
commitffda12a17a324103e9900fa1035309811eecbfe5 (patch)
tree79fe8aae79a41b467f2cdd055036b3017642a9f6 /kernel/sched_fair.c
parentb0aa51b999c449e5e3f9faa1ee406e052d407fe7 (diff)
sched: optimize group load balancer
I noticed that tg_shares_up() unconditionally takes rq-locks for all cpus in the sched_domain. This hurts. We need the rq-locks whenever we change the weight of the per-cpu group sched entities. To allevate this a little, only change the weight when the new weight is at least shares_thresh away from the old value. This avoids the rq-lock for the top level entries, since those will never be re-weighted, and fuzzes the lower level entries a little to gain performance in semi-stable situations. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_fair.c')
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