From: Abel Wu <wuyun.abel@bytedance.com>
To: Peter Zijlstra <peterz@infradead.org>,
Mel Gorman <mgorman@suse.de>,
Vincent Guittot <vincent.guittot@linaro.org>
Cc: Josh Don <joshdon@google.com>, Chen Yu <yu.c.chen@intel.com>,
linux-kernel@vger.kernel.org, Abel Wu <wuyun.abel@bytedance.com>
Subject: [PATCH 4/5] sched/fair: avoid double search on same cpu
Date: Tue, 12 Jul 2022 16:20:35 +0800 [thread overview]
Message-ID: <20220712082036.5130-5-wuyun.abel@bytedance.com> (raw)
In-Reply-To: <20220712082036.5130-1-wuyun.abel@bytedance.com>
The prev cpu is checked at the beginning of SIS, and it's unlikely
to be idle before the second check in select_idle_smt(). So we'd
better focus on its SMT siblings.
Signed-off-by: Abel Wu <wuyun.abel@bytedance.com>
Reviewed-by: Josh Don <joshdon@google.com>
---
kernel/sched/fair.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0d7e8555bcf9..e4cf000604fc 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6344,6 +6344,8 @@ static int select_idle_smt(struct task_struct *p, int target)
int cpu;
for_each_cpu_and(cpu, cpu_smt_mask(target), p->cpus_ptr) {
+ if (cpu == target)
+ continue;
if (available_idle_cpu(cpu) || sched_idle_cpu(cpu))
return cpu;
}
--
2.31.1
next prev parent reply other threads:[~2022-07-12 8:22 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-12 8:20 [PATCH 0/5] sched/fair: SIS improvements and cleanups Abel Wu
2022-07-12 8:20 ` [PATCH 1/5] sched/fair: ignore SIS_UTIL when has idle core Abel Wu
2022-07-13 3:47 ` Chen Yu
2022-07-13 16:14 ` Abel Wu
2022-07-14 6:19 ` Yicong Yang
2022-07-14 6:58 ` Abel Wu
2022-07-14 7:15 ` Yicong Yang
2022-07-14 8:00 ` Abel Wu
2022-07-14 8:16 ` Yicong Yang
2022-07-14 8:34 ` Yicong Yang
2022-08-04 9:59 ` Chen Yu
2022-08-15 2:54 ` Abel Wu
2022-08-10 13:50 ` Chen Yu
2022-08-15 2:44 ` Abel Wu
2022-08-29 13:08 ` Mel Gorman
2022-08-29 14:11 ` Abel Wu
2022-08-29 14:56 ` Mel Gorman
2022-09-01 13:08 ` Abel Wu
2022-09-02 4:12 ` Abel Wu
2022-09-02 10:25 ` Mel Gorman
2022-09-05 14:40 ` Abel Wu
2022-09-06 9:57 ` Mel Gorman
2022-09-07 7:27 ` Chen Yu
2022-09-07 8:41 ` Mel Gorman
2022-09-07 7:52 ` Abel Wu
2022-07-12 8:20 ` [PATCH 2/5] sched/fair: default to false in test_idle_cores Abel Wu
2022-08-29 12:36 ` Mel Gorman
2022-07-12 8:20 ` [PATCH 3/5] sched/fair: remove redundant check in select_idle_smt Abel Wu
2022-08-29 12:36 ` Mel Gorman
2022-07-12 8:20 ` Abel Wu [this message]
2022-08-29 12:36 ` [PATCH 4/5] sched/fair: avoid double search on same cpu Mel Gorman
2022-07-12 8:20 ` [PATCH 5/5] sched/fair: remove useless check in select_idle_core Abel Wu
2022-08-29 12:37 ` Mel Gorman
2022-08-15 13:31 ` [PATCH 0/5] sched/fair: SIS improvements and cleanups Abel Wu
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