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Date:   Wed, 24 Apr 2019 15:46:24 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Mel Gorman <mgorman@techsingularity.net>
Cc:     Andrey Ryabinin <aryabinin@virtuozzo.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] mm/page_alloc: fix never set ALLOC_NOFRAGMENT flag
Message-Id: <20190424154624.f1084195c36684453a557718@linux-foundation.org>
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        <20190423120143.f555f77df02a266ba2a7f1fc@linux-foundation.org>
        <20190424090403.GS18914@techsingularity.net>
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On Wed, 24 Apr 2019 10:04:03 +0100 Mel Gorman <mgorman@techsingularity.net> wrote:

> On Tue, Apr 23, 2019 at 12:01:43PM -0700, Andrew Morton wrote:
> > On Tue, 23 Apr 2019 15:08:06 +0300 Andrey Ryabinin <aryabinin@virtuozzo.com> wrote:
> > 
> > > Commit 0a79cdad5eb2 ("mm: use alloc_flags to record if kswapd can wake")
> > > removed setting of the ALLOC_NOFRAGMENT flag. Bring it back.
> > 
> > What are the runtime effects of this fix?
> 
> The runtime effect is that ALLOC_NOFRAGMENT behaviour is restored so
> that allocations are spread across local zones to avoid fragmentation
> due to mixing pageblocks as long as possible.

OK, thanks.  Is this worth a -stable backport?