linux-kernel - Re: [PATCH] mm, memory_hotplug: do not back off draining pcp free pages from kworker context

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Message-ID: <20170919185745.GB828415@devbig577.frc2.facebook.com>
Date:   Tue, 19 Sep 2017 11:57:45 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm, memory_hotplug: do not back off draining pcp free
 pages from kworker context

Hello,

On Tue, Sep 19, 2017 at 11:45:21AM +0200, Michal Hocko wrote:
> > So, this shouldn't be an issue.  This may get affected by direct
> > reclaim frenzy but it's only a small piece of the whole symptom and we
> > gotta fix that at the source.
> 
> OK, so there shouldn't be any issue with the patch, right?

idk, it'll make the code path more susceptible to direct reclaim
starvations, so it's difficult to claim that there won't be *any*
problems; however, given the extent of the starvation problem, this
likely won't add any noticeable issues.

Thanks.

-- 
tejun