linux-kernel - Re: [PATCH v2 14/19] sched/numa: Updation of scan period need not be in lock

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Message-ID: <20180621095143.4a4ikeffphcz7ruw@techsingularity.net>
Date:   Thu, 21 Jun 2018 10:51:43 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 14/19] sched/numa: Updation of scan period need not be
 in lock

On Wed, Jun 20, 2018 at 10:32:55PM +0530, Srikar Dronamraju wrote:
> The metrics for updating scan periods are local or task specific.
> Currently this updation happens under numa_group lock which seems
> unnecessary. Hence move this updation outside the lock.
> 
> Running SPECjbb2005 on a 4 node machine and comparing bops/JVM
> JVMS  LAST_PATCH  WITH_PATCH  %CHANGE
> 16    25355.9     25645.4     1.141
> 1     72812       72142       -0.92
> 
> Reviewed-by: Rik van Riel <riel@...riel.com>
> Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

Acked-by: Mel Gorman <mgorman@...hsingularity.net>

-- 
Mel Gorman
SUSE Labs