| From | Morten Rasmussen <> | Subject | [RFCv3 PATCH 47/48] sched: Enable active migration for cpus of lower capacity | Date | Wed, 4 Feb 2015 18:31:24 +0000 |
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Add an extra criteria to need_active_balance() to kick off active load balance if the source cpu is overutilized and has lower capacity than the destination cpus.
cc: Ingo Molnar <mingo@redhat.com> cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com> --- kernel/sched/fair.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 92fd1d8..1c248f8 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7379,6 +7379,13 @@ static int need_active_balance(struct lb_env *env) return 1; } + if ((capacity_of(env->src_cpu) < capacity_of(env->dst_cpu)) && + env->src_rq->cfs.h_nr_running == 1 && + cpu_overutilized(env->src_cpu, env->sd) && + !cpu_overutilized(env->dst_cpu, env->sd)) { + return 1; + } + return unlikely(sd->nr_balance_failed > sd->cache_nice_tries+2); } -- 1.9.1
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