linux-kernel - Re: [PATCH v2 2/2] sched/core: Adjusting the order of scanning CPU

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Message-ID: <20221114121517.vwg4rr5xb3nvwpjy@techsingularity.net>
Date:   Mon, 14 Nov 2022 12:15:17 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Hao Jia <jiahao.os@...edance.com>
Cc:     mingo@...hat.com, peterz@...radead.org, mingo@...nel.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] sched/core: Adjusting the order of scanning CPU

On Wed, Oct 26, 2022 at 02:43:00PM +0800, Hao Jia wrote:
> When select_idle_capacity() starts scanning for an idle CPU, it starts
> with target CPU that has already been checked in select_idle_sibling().
> So we start checking from the next CPU and try the target CPU at the end.
> Similarly for task_numa_assign(), we have just checked numa_migrate_on
> of dst_cpu, so start from the next CPU. This also works for
> steal_cookie_task(), the first scan must fail and start directly
> from the next one.
> 
> Signed-off-by: Hao Jia <jiahao.os@...edance.com>

Test results in general look ok so

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

-- 
Mel Gorman
SUSE Labs