From: "tip-bot2 for Mel Gorman" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Mel Gorman <mgorman@techsingularity.net>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: sched/core] sched/fair: Avoid a second scan of target in select_idle_cpu
Date: Thu, 05 Aug 2021 09:34:33 -0000 [thread overview]
Message-ID: <162815607370.395.4560583728552595431.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20210804115857.6253-3-mgorman@techsingularity.net>
The following commit has been merged into the sched/core branch of tip:
Commit-ID: 56498cfb045d7147cdcba33795d19429afcd1d00
Gitweb: https://git.kernel.org/tip/56498cfb045d7147cdcba33795d19429afcd1d00
Author: Mel Gorman <mgorman@techsingularity.net>
AuthorDate: Wed, 04 Aug 2021 12:58:57 +01:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Wed, 04 Aug 2021 15:16:44 +02:00
sched/fair: Avoid a second scan of target in select_idle_cpu
When select_idle_cpu starts scanning for an idle CPU, it starts with
a target CPU that has already been checked by select_idle_sibling.
This patch starts with the next CPU instead.
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210804115857.6253-3-mgorman@techsingularity.net
---
kernel/sched/fair.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7ee394b..47a0fbf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6220,7 +6220,7 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, bool
time = cpu_clock(this);
}
- for_each_cpu_wrap(cpu, cpus, target) {
+ for_each_cpu_wrap(cpu, cpus, target + 1) {
if (has_idle_core) {
i = select_idle_core(p, cpu, cpus, &idle_cpu);
if ((unsigned int)i < nr_cpumask_bits)
next prev parent reply other threads:[~2021-08-05 9:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-04 11:58 [PATCH 0/2] Reduce SIS scanning Mel Gorman
2021-08-04 11:58 ` [PATCH 1/2] sched/fair: Use prev instead of new target as recent_used_cpu Mel Gorman
2021-08-05 9:34 ` [tip: sched/core] " tip-bot2 for Mel Gorman
2021-08-04 11:58 ` [PATCH 2/2] sched/fair: Avoid a second scan of target in select_idle_cpu Mel Gorman
2021-08-05 9:34 ` tip-bot2 for Mel Gorman [this message]
2021-08-04 13:11 ` [PATCH 0/2] Reduce SIS scanning Peter Zijlstra
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