From: Mel Gorman <mgorman@techsingularity.net>
To: Peter Ziljstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
LKML <linux-kernel@vger.kernel.org>
Cc: Barry Song <song.bao.hua@hisilicon.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Aubrey Li <aubrey.li@linux.intel.com>,
Valentin Schneider <valentin.schneider@arm.com>,
Linux-ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 0/4] Reduce scanning of runqueues in select_idle_sibling
Date: Wed, 9 Dec 2020 14:37:48 +0000 [thread overview]
Message-ID: <20201209143748.GP3371@techsingularity.net> (raw)
In-Reply-To: <20201208153501.1467-1-mgorman@techsingularity.net>
On Tue, Dec 08, 2020 at 03:34:57PM +0000, Mel Gorman wrote:
> Changelog since v1
> o Drop single-pass patch (vincent)
> o Scope variables used for SIS_AVG_CPU (dietmar)
> o Remove redundant assignment (dietmar
>
> This reduces the amount of runqueue scanning in select_idle_sibling in
> the worst case.
>
> Patch 1 removes SIS_AVG_CPU because it's unused.
>
> Patch 2 moves all SIS_PROP-related calculations under SIS_PROP
>
> Patch 3 improves the hit rate of p->recent_used_cpu to reduce the amount
> of scanning. It should be relatively uncontroversial
>
> Patch 4 returns an idle candidate if one is found while scanning for a
> free core.
>
Any other objections to the series? Vincent marked 1, 3 and 4 as
reviewed. While patch 2 had some mild cosmetic concerns, I think the
version and how it treats SIS_PROP is fine as it is to keep it
functionally equivalent to !SIS_PROP and without adding too many
SIS_PROP checks.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2020-12-09 14:39 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-08 15:34 [PATCH 0/4] Reduce scanning of runqueues in select_idle_sibling Mel Gorman
2020-12-08 15:34 ` [PATCH 1/4] sched/fair: Remove SIS_AVG_CPU Mel Gorman
2020-12-08 16:13 ` Vincent Guittot
2020-12-08 15:34 ` [PATCH 2/4] sched/fair: Move avg_scan_cost calculations under SIS_PROP Mel Gorman
2020-12-08 16:03 ` Vincent Guittot
2020-12-08 16:30 ` Mel Gorman
2020-12-09 5:28 ` Li, Aubrey
2020-12-09 9:05 ` Mel Gorman
2020-12-09 11:07 ` Li, Aubrey
2020-12-09 11:33 ` Mel Gorman
2020-12-10 5:18 ` Li, Aubrey
2020-12-10 9:32 ` Mel Gorman
2020-12-08 15:35 ` [PATCH 3/4] sched/fair: Do not replace recent_used_cpu with the new target Mel Gorman
2020-12-08 16:14 ` Vincent Guittot
2020-12-10 9:40 ` Vincent Guittot
2020-12-11 6:25 ` Hillf Danton
2020-12-11 9:02 ` Mel Gorman
2020-12-11 9:34 ` Hillf Danton
2020-12-11 9:45 ` Mel Gorman
2020-12-08 15:35 ` [PATCH 4/4] sched/fair: Return an idle cpu if one is found after a failed search for an idle core Mel Gorman
2020-12-08 16:15 ` Vincent Guittot
2020-12-09 14:37 ` Mel Gorman [this message]
2020-12-10 8:00 ` [PATCH 0/4] Reduce scanning of runqueues in select_idle_sibling Vincent Guittot
2020-12-10 9:38 ` Vincent Guittot
2020-12-10 11:04 ` Mel Gorman
2020-12-11 9:51 ` Vincent Guittot
2020-12-11 10:23 ` Mel Gorman
2020-12-12 10:02 ` Vincent Guittot
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