linux-kernel - Re: [PATCH 1/2] sched/fair: Use weight of SD_NUMA domain in find_busiest

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Message-ID: <20211203105327.GC3366@techsingularity.net>
Date:   Fri, 3 Dec 2021 10:53:27 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Barry Song <21cnbao@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Barry Song <song.bao.hua@...ilicon.com>,
        Mike Galbraith <efault@....de>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] sched/fair: Use weight of SD_NUMA domain in
 find_busiest_group

On Fri, Dec 03, 2021 at 09:38:33PM +1300, Barry Song wrote:
> On Fri, Dec 3, 2021 at 8:27 PM Mel Gorman <mgorman@...hsingularity.net> wrote:
> >
> > find_busiest_group uses the child domain's group weight instead of
> > the sched_domain's weight that has SD_NUMA set when calculating the
> > allowed imbalance between NUMA nodes. This is wrong and inconsistent
> > with find_idlest_group.
> >
> > This patch uses the SD_NUMA weight in both.
> >
> > Fixes: c4e8f691d926 ("sched/fair: Adjust the allowed NUMA imbalance when SD_NUMA spans multiple LLCS")
> 
> Hi Mel,
> 
> sorry I might be missing something. but I have failed to figure out
> where this commit is.
> 

Stupid cut&paste error and failing to check it properly

7d2b5dd0bcc4 ("sched/numa: Allow a floating imbalance between NUMA nodes")

-- 
Mel Gorman
SUSE Labs