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
Date: Thu, 25 Apr 2019 14:09:08 -0700 [thread overview]
Message-ID: <20190425140908.7da3c4e52663196c7b914b00@linux-foundation.org> (raw)
In-Reply-To: <20190424234052.GW18914@techsingularity.net>
On Thu, 25 Apr 2019 00:40:53 +0100 Mel Gorman <mgorman@techsingularity.net> wrote:
> On Wed, Apr 24, 2019 at 03:46:24PM -0700, Andrew Morton wrote:
> > 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?
>
> Yes, but only for 5.0 obviously and both should be included if that is
> the case. I did not push for it initially as problems in this area are
> hard for a general user to detect and people have not complained about
> 5.0's fragmentation handling.
Ah, OK. 0a79cdad5eb2 didn't have a -stable tag so I suppose we can
leave this patch un-stabled.
If they went and backported 0a79cdad5eb2 anyway, let's hope the scripts
are smart enough to catch this patch's Fixes: link.
next prev parent reply other threads:[~2019-04-25 21:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-23 12:08 [PATCH 1/2] mm/page_alloc: avoid potential NULL pointer dereference Andrey Ryabinin
2019-04-23 12:08 ` [PATCH 2/2] mm/page_alloc: fix never set ALLOC_NOFRAGMENT flag Andrey Ryabinin
2019-04-23 14:35 ` Mel Gorman
2019-04-23 19:01 ` Andrew Morton
2019-04-24 9:04 ` Mel Gorman
2019-04-24 22:46 ` Andrew Morton
2019-04-24 23:40 ` Mel Gorman
2019-04-25 21:09 ` Andrew Morton [this message]
2019-04-23 14:35 ` [PATCH 1/2] mm/page_alloc: avoid potential NULL pointer dereference Mel Gorman
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