diff options
| author | Dietmar Eggemann <dietmar.eggemann@arm.com> | 2015-01-20 15:43:04 +0000 |
|---|---|---|
| committer | Robin Randhawa <robin.randhawa@arm.com> | 2015-04-09 12:26:15 +0100 |
| commit | 93859f6416c77c358d316e1b291524bd3ec0316d (patch) | |
| tree | 43683884f3c1ee65666b0b477c4bc501ba2cef67 | |
| parent | dd28dc5ee35875b167efb1ee8ece7318556e984b (diff) | |
sched: Tipping point from energy-aware to conventional load balancing
Energy-aware load balancing bases on cpu usage so the upper bound of its
operational range is a fully utilized cpu. Above this tipping point it
makes more sense to use weighted_cpuload to preserve smp_nice.
This patch implements the tipping point detection in update_sg_lb_stats
as if one cpu is over-utilized the current energy-aware load balance
operation will fall back into the conventional weighted load based one.
cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
| -rw-r--r-- | kernel/sched/fair.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 09c188d7e508..42cd7cbe58b6 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6271,6 +6271,10 @@ static inline void update_sg_lb_stats(struct lb_env *env, sgs->sum_weighted_load += weighted_cpuload(i); if (idle_cpu(i)) sgs->idle_cpus++; + + /* If cpu is over-utilized, bail out of ea */ + if (env->use_ea && cpu_overutilized(i, env->sd)) + env->use_ea = false; } /* Adjust by relative CPU capacity of the group */ |