linux-kernel - Re: [PATCH 2/2] mm/page_alloc: fix never set ALLOC

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Message-ID: <20190424090403.GS18914@techsingularity.net>
Date:   Wed, 24 Apr 2019 10:04:03 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm/page_alloc: fix never set ALLOC_NOFRAGMENT flag

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@...tuozzo.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.

-- 
Mel Gorman
SUSE Labs