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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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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman@techsingularity.net>
To: Peter Ziljstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>
Cc: Aubrey Li <aubrey.li@linux.intel.com>,
	Barry Song <song.bao.hua@hisilicon.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	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

  parent reply	other threads:[~2020-12-09 14:39 UTC|newest]

Thread overview: 54+ 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 ` Mel Gorman
2020-12-08 15:34 ` [PATCH 1/4] sched/fair: Remove SIS_AVG_CPU Mel Gorman
2020-12-08 15:34   ` Mel Gorman
2020-12-08 16:13   ` Vincent Guittot
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 15:34   ` Mel Gorman
2020-12-08 16:03   ` Vincent Guittot
2020-12-08 16:03     ` Vincent Guittot
2020-12-08 16:30     ` Mel Gorman
2020-12-08 16:30       ` Mel Gorman
2020-12-09  5:28     ` Li, Aubrey
2020-12-09  5:28       ` Li, Aubrey
2020-12-09  9:05       ` Mel Gorman
2020-12-09  9:05         ` Mel Gorman
2020-12-09 11:07         ` Li, Aubrey
2020-12-09 11:07           ` Li, Aubrey
2020-12-09 11:33           ` Mel Gorman
2020-12-09 11:33             ` Mel Gorman
2020-12-10  5:18   ` Li, Aubrey
2020-12-10  5:18     ` Li, Aubrey
2020-12-10  9:32     ` Mel Gorman
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 15:35   ` Mel Gorman
2020-12-08 16:14   ` Vincent Guittot
2020-12-08 16:14     ` Vincent Guittot
2020-12-10  9:40     ` 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  9:02       ` Mel Gorman
2020-12-11  9:34       ` Hillf Danton
2020-12-11  9:45         ` Mel Gorman
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 15:35   ` Mel Gorman
2020-12-08 16:15   ` Vincent Guittot
2020-12-08 16:15     ` Vincent Guittot
2020-12-09 14:37 ` Mel Gorman [this message]
2020-12-09 14:37   ` [PATCH 0/4] Reduce scanning of runqueues in select_idle_sibling Mel Gorman
2020-12-10  8:00   ` Vincent Guittot
2020-12-10  8:00     ` Vincent Guittot
2020-12-10  9:38     ` Vincent Guittot
2020-12-10  9:38       ` Vincent Guittot
2020-12-10 11:04       ` Mel Gorman
2020-12-10 11:04         ` Mel Gorman
2020-12-11  9:51         ` Vincent Guittot
2020-12-11  9:51           ` Vincent Guittot
2020-12-11 10:23           ` Mel Gorman
2020-12-11 10:23             ` Mel Gorman
2020-12-12 10:02             ` Vincent Guittot
2020-12-12 10:02               ` Vincent Guittot

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