From: Mel Gorman <mgorman@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Rik van Riel <riel@redhat.com>,
George Spelvin <linux@horizon.com>,
Johannes Hirte <johannes.hirte@fem.tu-ilmenau.de>,
Tomas Racek <tracek@redhat.com>, Jan Kara <jack@suse.cz>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Josh Boyer <jwboyer@gmail.com>,
Valdis Kletnieks <Valdis.Kletnieks@vt.edu>,
Jiri Slaby <jslaby@suse.cz>,
Thorsten Leemhuis <fedora@leemhuis.info>,
Zdenek Kabelac <zkabelac@redhat.com>,
Bruno Wolff III <bruno@wolff.to>, linux-mm <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: kswapd craziness in 3.7
Date: Wed, 28 Nov 2012 23:54:12 +0000 [thread overview]
Message-ID: <20121128235412.GW8218@suse.de> (raw)
In-Reply-To: <20121128145215.d23aeb1b.akpm@linux-foundation.org>
On Wed, Nov 28, 2012 at 02:52:15PM -0800, Andrew Morton wrote:
> On Wed, 28 Nov 2012 10:13:59 +0000
> Mel Gorman <mgorman@suse.de> wrote:
>
> > Based on the reports I've seen I expect the following to work for 3.7
> >
> > Keep
> > 96710098 mm: revert "mm: vmscan: scale number of pages reclaimed by reclaim/compaction based on failures"
> > ef6c5be6 fix incorrect NR_FREE_PAGES accounting (appears like memory leak)
> >
> > Revert
> > 82b212f4 Revert "mm: remove __GFP_NO_KSWAPD"
> >
> > Merge
> > mm: vmscan: fix kswapd endless loop on higher order allocation
> > mm: Avoid waking kswapd for THP allocations when compaction is deferred or contended
>
> "mm: Avoid waking kswapd for THP ..." is marked "I have not tested it
> myself" and when Zdenek tested it he hit an unexplained oom.
>
I thought Zdenek was testing with __GFP_NO_KSWAPD when he hit that OOM.
Further, when he hit that OOM, it looked like a genuine OOM. He had no
swap configured and inactive/active file pages were very low. Finally,
the free pages for Normal looked off and could also have been affected by
the accounting bug. I'm looking at https://lkml.org/lkml/2012/11/18/132
here. Are you thinking of something else?
I have not tested with the patch admittedly but Thorsten has and seemed
to be ok with it https://lkml.org/lkml/2012/11/23/276.
> > Johannes' patch should remove the necessity for __GFP_NO_KSWAPD revert but I
> > think we should also avoid waking kswapd for THP allocations if compaction
> > is deferred. Johannes' patch might mean that kswapd goes quickly go back
> > to sleep but it's still busy work.
> >
> > 3.6 is still known to be screwed in terms of THP because of the amount of
> > time it can spend in compaction after lumpy reclaim was removed. This is
> > my old list of patches I felt needed to be backported after 3.7 came out.
> > They are not tagged -stable, I'll be sending it to Greg manually.
> >
> > e64c523 mm: compaction: abort compaction loop if lock is contended or run too long
> > 3cc668f mm: compaction: move fatal signal check out of compact_checklock_irqsave
> > 661c4cb mm: compaction: Update try_to_compact_pages()kerneldoc comment
> > 2a1402a mm: compaction: acquire the zone->lru_lock as late as possible
> > f40d1e4 mm: compaction: acquire the zone->lock as late as possible
> > 753341a revert "mm: have order > 0 compaction start off where it left"
> > bb13ffe mm: compaction: cache if a pageblock was scanned and no pages were isolated
> > c89511a mm: compaction: Restart compaction from near where it left off
> > 6299702 mm: compaction: clear PG_migrate_skip based on compaction and reclaim activity
> > 0db63d7 mm: compaction: correct the nr_strict va isolated check for CMA
> >
> > Only Johannes' patch needs to be added to this list. kswapd is not woken
> > for THP in 3.6 but as it calls compaction for other high-order allocations
> > it still makes sense.
>
> Please identify "Johannes' patch"?
mm: vmscan: fix kswapd endless loop on higher order allocation
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2012-11-28 23:54 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-27 20:48 kswapd craziness in 3.7 Johannes Weiner
2012-11-27 20:48 ` [patch] mm: vmscan: fix kswapd endless loop on higher order allocation Johannes Weiner
2012-11-27 20:58 ` kswapd craziness in 3.7 Linus Torvalds
2012-11-27 21:16 ` Rik van Riel
2012-11-27 21:49 ` Johannes Weiner
2012-11-27 22:02 ` Rik van Riel
2012-11-27 22:26 ` Johannes Weiner
2012-11-27 23:19 ` Linus Torvalds
2012-11-28 10:13 ` Mel Gorman
2012-11-28 10:51 ` Thorsten Leemhuis
2012-11-28 16:42 ` Mel Gorman
2012-11-28 22:52 ` Andrew Morton
2012-11-28 23:54 ` Mel Gorman [this message]
2012-11-29 0:14 ` Andrew Morton
2012-11-29 15:30 ` Thorsten Leemhuis
2012-11-29 17:05 ` Johannes Weiner
2012-11-30 12:39 ` Thorsten Leemhuis
2012-12-01 0:45 ` Johannes Weiner
2012-12-03 8:30 ` Thorsten Leemhuis
2012-12-03 13:08 ` Fedora repo (was: Re: kswapd craziness in 3.7) Borislav Petkov
2012-12-03 19:42 ` kswapd craziness in 3.7 Johannes Weiner
2012-12-04 21:42 ` Johannes Weiner
2012-12-05 3:01 ` Bruno Wolff III
2012-12-06 17:37 ` Bruno Wolff III
2012-12-06 19:31 ` Linus Torvalds
2012-12-06 19:43 ` Rik van Riel
2012-12-06 20:23 ` Johannes Weiner
2012-12-06 20:32 ` Rik van Riel
2012-12-08 12:06 ` Zlatko Calusic
2012-12-08 21:22 ` Zlatko Calusic
2012-12-09 1:01 ` Linus Torvalds
2012-12-09 21:59 ` Zdenek Kabelac
2012-12-10 11:03 ` Mel Gorman
2012-12-10 16:39 ` Johannes Weiner
2012-12-10 18:01 ` Mel Gorman
2012-12-10 18:33 ` Zlatko Calusic
2012-12-10 19:13 ` Linus Torvalds
2012-12-10 20:35 ` Zlatko Calusic
2012-12-10 21:28 ` Linus Torvalds
2012-12-10 21:42 ` Borislav Petkov
2012-12-10 21:47 ` Linus Torvalds
2012-12-10 21:54 ` Borislav Petkov
2012-12-10 22:15 ` Zlatko Calusic
2012-12-10 23:27 ` Hugh Dickins
2012-12-11 0:19 ` Zlatko Calusic
2012-12-11 21:56 ` Zlatko Calusic
2012-12-19 22:24 ` Zlatko Calusic
2012-12-10 18:29 ` Zlatko Calusic
2012-12-06 8:09 ` Thorsten Leemhuis
2012-11-27 21:29 ` Johannes Weiner
2012-11-28 13:35 ` Zdenek Kabelac
2012-11-28 14:04 ` Jiri Slaby
2012-11-28 9:45 ` Mel Gorman
2012-12-03 15:23 ` Zdenek Kabelac
2012-12-03 19:18 ` Johannes Weiner
2012-12-04 9:05 ` Zdenek Kabelac
2012-12-04 9:15 ` Jiri Slaby
2012-12-04 16:11 ` Johannes Weiner
2012-12-04 16:22 ` Jiri Slaby
2012-12-04 19:50 ` Johannes Weiner
2012-12-08 10:35 ` Jiri Slaby
2012-12-04 16:15 ` Johannes Weiner
2012-12-06 13:51 ` Zdenek Kabelac
2012-12-03 13:14 ` Jiri Slaby
2012-12-04 8:55 ` Jiri Slaby
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