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From: Peng Wang <rocking@linux.alibaba.com>
To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
	vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
	rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de
Cc: linux-kernel@vger.kernel.org, Peng Wang <rocking@linux.alibaba.com>
Subject: [PATCH] schied/fair: Skip updating "contrib" without load
Date: Sat,  7 Dec 2019 00:14:22 +0800	[thread overview]
Message-ID: <1575648862-12095-1-git-send-email-rocking@linux.alibaba.com> (raw)

We only update load_sum/runnable_load_sum/util_sum with
decayed old sum when load is clear.

Signed-off-by: Peng Wang <rocking@linux.alibaba.com>
---
 kernel/sched/pelt.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c
index a96db50..4392953 100644
--- a/kernel/sched/pelt.c
+++ b/kernel/sched/pelt.c
@@ -129,8 +129,9 @@ static u32 __accumulate_pelt_segments(u64 periods, u32 d1, u32 d3)
 		 * Step 2
 		 */
 		delta %= 1024;
-		contrib = __accumulate_pelt_segments(periods,
-				1024 - sa->period_contrib, delta);
+		if (load)
+			contrib = __accumulate_pelt_segments(periods,
+					1024 - sa->period_contrib, delta);
 	}
 	sa->period_contrib = delta;
 
-- 
1.8.3.1


             reply	other threads:[~2019-12-06 16:15 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-06 16:14 Peng Wang [this message]
2019-12-09 16:16 ` [PATCH] schied/fair: Skip updating "contrib" without load Peter Zijlstra
2019-12-11 12:16   ` Peng Wang
2019-12-13  3:45 ` [PATCH v2] schied/fair: Skip calculating @contrib " Peng Wang
2019-12-13  9:21   ` Vincent Guittot
2019-12-13 12:13   ` Peter Zijlstra
2019-12-17 12:39   ` [tip: sched/core] " tip-bot2 for Peng Wang

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