linux-kernel - Re: [PATCH 3/4] sched/fair: Clear SMT siblings after determining the core is not idle

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Message-ID: <jhjzhc7kxkb.mognet@arm.com>
Date:   Mon, 23 Mar 2020 13:31:00 +0000
From:   Valentin Schneider <valentin.schneider@....com>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Phil Auld <pauld@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] sched/fair: Clear SMT siblings after determining the core is not idle


On Fri, Mar 20 2020, Mel Gorman wrote:
> The clearing of SMT siblings from the SIS mask before checking for an idle
> core is a small but unnecessary cost. Defer the clearing of the siblings
> until the scan moves to the next potential target. The cost of this was
> not measured as it is borderline noise but it should be self-evident.
>
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>

Reviewed-by: Valentin Schneider <valentin.schneider@....com>