| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 4 Feb 2015 18:31:22 +0000 From: Morten Rasmussen <morten.rasmussen@....com> To: peterz@...radead.org, mingo@...hat.com Cc: vincent.guittot@...aro.org, dietmar.eggemann@....com, yuyang.du@...el.com, preeti@...ux.vnet.ibm.com, mturquette@...aro.org, nico@...aro.org, rjw@...ysocki.net, juri.lelli@....com, linux-kernel@...r.kernel.org Subject: [RFCv3 PATCH 45/48] sched: Skip cpu as lb src which has one task and capacity gte the dst cpu From: Dietmar Eggemann <dietmar.eggemann@....com> Skip cpu as a potential src (costliest) in case it has only one task running and its original capacity is greater than or equal to the original capacity of the dst cpu. cc: Ingo Molnar <mingo@...hat.com> cc: Peter Zijlstra <peterz@...radead.org> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com> --- kernel/sched/fair.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 4849bad..b6e2e92 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7251,6 +7251,10 @@ static struct rq *find_busiest_queue(struct lb_env *env, }; unsigned long energy = sched_group_energy(&eenv); + if (rq->nr_running == 1 && capacity_orig_of(i) >= + capacity_orig_of(env->dst_cpu)) + continue; + /* * We're looking for the minimal cpu efficiency * min(u_i / e_i), crosswise multiplication leads to -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists