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Message-ID: <1374601332.9192.0.camel@localhost.localdomain> Date: Tue, 23 Jul 2013 23:42:12 +0600 From: Rakib Mullick <rakib.mullick@...il.com> To: mingo@...nel.org, peterz@...radead.org Cc: linux-kernel@...r.kernel.org Subject: [PATCH v2] sched: update_top_cache_domain only at the times of building sched domain. Currently, update_top_cache_domain() is called whenever schedule domain is built or destroyed. But, the following callpath shows that they're at the same callpath and can be avoided update_top_cache_domain() while destroying schedule domain and update only at the times of building schedule domains. partition_sched_domains() detach_destroy_domain() cpu_attach_domain() update_top_cache_domain() build_sched_domains() cpu_attach_domain() update_top_cache_domain() Changes since v1: use sd to determine when to skip, courtesy PeterZ Signed-off-by: Rakib Mullick <rakib.mullick@...il.com> --- diff --git a/kernel/sched/core.c b/kernel/sched/core.c index b7c32cb..387fb66 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5138,7 +5138,8 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu) rcu_assign_pointer(rq->sd, sd); destroy_sched_domains(tmp, cpu); - update_top_cache_domain(cpu); + if (sd) + update_top_cache_domain(cpu); } /* cpus with isolated domains */ -- 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/
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