From: Zlatko Calusic <zlatko.calusic@iskon.hr>
To: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Rik van Riel <riel@redhat.com>, linux-mm <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: kswapd craziness in 3.7
Date: Mon, 10 Dec 2012 19:33:10 +0100 [thread overview]
Message-ID: <50C62AE6.3030000@iskon.hr> (raw)
In-Reply-To: <20121210180141.GK1009@suse.de>
On 10.12.2012 19:01, Mel Gorman wrote:
> In this last-minute disaster, I'm not thinking properly at all any more. The
> shrink slab disabling should have happened before the loop_again but even
> then it's wrong because it's just covering over the problem.
>
> The way order and testorder interact with how balanced is calculated means
> that we potentially call shrink_slab() multiple times and that thing is
> global in nature and basically uncontrolled. You could argue that we should
> only call shrink_slab() if order-0 watermarks are not met but that will
> not necessarily prevent kswapd reclaiming too much. It keeps going back
> to balance_pgdat needing its list of requirements drawn up and receive
> some major surgery and we're not going to do that as a quick hack.
>
I was about to apply the patch that you sent, and reboot the server, but
it seems there's no point because the patch is flawed?
Anyway, if and when you have a proper one, I'll be glad to test it for
you and report results.
--
Zlatko
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WARNING: multiple messages have this Message-ID (diff)
From: Zlatko Calusic <zlatko.calusic@iskon.hr>
To: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Rik van Riel <riel@redhat.com>, linux-mm <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: kswapd craziness in 3.7
Date: Mon, 10 Dec 2012 19:33:10 +0100 [thread overview]
Message-ID: <50C62AE6.3030000@iskon.hr> (raw)
In-Reply-To: <20121210180141.GK1009@suse.de>
On 10.12.2012 19:01, Mel Gorman wrote:
> In this last-minute disaster, I'm not thinking properly at all any more. The
> shrink slab disabling should have happened before the loop_again but even
> then it's wrong because it's just covering over the problem.
>
> The way order and testorder interact with how balanced is calculated means
> that we potentially call shrink_slab() multiple times and that thing is
> global in nature and basically uncontrolled. You could argue that we should
> only call shrink_slab() if order-0 watermarks are not met but that will
> not necessarily prevent kswapd reclaiming too much. It keeps going back
> to balance_pgdat needing its list of requirements drawn up and receive
> some major surgery and we're not going to do that as a quick hack.
>
I was about to apply the patch that you sent, and reboot the server, but
it seems there's no point because the patch is flawed?
Anyway, if and when you have a proper one, I'll be glad to test it for
you and report results.
--
Zlatko
next prev parent reply other threads:[~2012-12-10 18:33 UTC|newest]
Thread overview: 129+ 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 ` Johannes Weiner
2012-11-27 20:48 ` [patch] mm: vmscan: fix kswapd endless loop on higher order allocation Johannes Weiner
2012-11-27 20:48 ` Johannes Weiner
2012-11-27 20:58 ` kswapd craziness in 3.7 Linus Torvalds
2012-11-27 20:58 ` Linus Torvalds
2012-11-27 21:16 ` Rik van Riel
2012-11-27 21:16 ` Rik van Riel
2012-11-27 21:49 ` Johannes Weiner
2012-11-27 21:49 ` Johannes Weiner
2012-11-27 22:02 ` Rik van Riel
2012-11-27 22:02 ` Rik van Riel
2012-11-27 22:26 ` Johannes Weiner
2012-11-27 22:26 ` Johannes Weiner
2012-11-27 23:19 ` Linus Torvalds
2012-11-27 23:19 ` Linus Torvalds
2012-11-28 10:13 ` Mel Gorman
2012-11-28 10:13 ` Mel Gorman
2012-11-28 10:51 ` Thorsten Leemhuis
2012-11-28 10:51 ` Thorsten Leemhuis
2012-11-28 16:42 ` Mel Gorman
2012-11-28 16:42 ` Mel Gorman
2012-11-28 22:52 ` Andrew Morton
2012-11-28 22:52 ` Andrew Morton
2012-11-28 23:54 ` Mel Gorman
2012-11-28 23:54 ` Mel Gorman
2012-11-29 0:14 ` Andrew Morton
2012-11-29 0:14 ` Andrew Morton
2012-11-29 15:30 ` Thorsten Leemhuis
2012-11-29 15:30 ` Thorsten Leemhuis
2012-11-29 17:05 ` Johannes Weiner
2012-11-29 17:05 ` Johannes Weiner
2012-11-30 12:39 ` Thorsten Leemhuis
2012-11-30 12:39 ` Thorsten Leemhuis
2012-12-01 0:45 ` Johannes Weiner
2012-12-01 0:45 ` Johannes Weiner
2012-12-03 8:30 ` Thorsten Leemhuis
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 13:08 ` Borislav Petkov
2012-12-03 19:42 ` kswapd craziness in 3.7 Johannes Weiner
2012-12-03 19:42 ` Johannes Weiner
2012-12-04 21:42 ` Johannes Weiner
2012-12-04 21:42 ` Johannes Weiner
2012-12-05 3:01 ` Bruno Wolff III
2012-12-05 3:01 ` Bruno Wolff III
2012-12-06 17:37 ` Bruno Wolff III
2012-12-06 17:37 ` Bruno Wolff III
2012-12-06 19:31 ` Linus Torvalds
2012-12-06 19:31 ` Linus Torvalds
2012-12-06 19:43 ` Rik van Riel
2012-12-06 19:43 ` Rik van Riel
2012-12-06 20:23 ` Johannes Weiner
2012-12-06 20:23 ` Johannes Weiner
2012-12-06 20:32 ` Rik van Riel
2012-12-06 20:32 ` Rik van Riel
2012-12-08 12:06 ` Zlatko Calusic
2012-12-08 12:06 ` Zlatko Calusic
2012-12-08 21:22 ` Zlatko Calusic
2012-12-08 21:22 ` Zlatko Calusic
2012-12-09 1:01 ` Linus Torvalds
2012-12-09 1:01 ` Linus Torvalds
2012-12-09 21:59 ` Zdenek Kabelac
2012-12-09 21:59 ` Zdenek Kabelac
2012-12-10 11:03 ` Mel Gorman
2012-12-10 11:03 ` Mel Gorman
2012-12-10 16:39 ` Johannes Weiner
2012-12-10 16:39 ` Johannes Weiner
2012-12-10 18:01 ` Mel Gorman
2012-12-10 18:01 ` Mel Gorman
2012-12-10 18:33 ` Zlatko Calusic [this message]
2012-12-10 18:33 ` Zlatko Calusic
2012-12-10 19:13 ` Linus Torvalds
2012-12-10 19:13 ` Linus Torvalds
2012-12-10 20:35 ` Zlatko Calusic
2012-12-10 20:35 ` Zlatko Calusic
2012-12-10 21:28 ` Linus Torvalds
2012-12-10 21:28 ` Linus Torvalds
2012-12-10 21:42 ` Borislav Petkov
2012-12-10 21:42 ` Borislav Petkov
2012-12-10 21:47 ` Linus Torvalds
2012-12-10 21:47 ` Linus Torvalds
2012-12-10 21:54 ` Borislav Petkov
2012-12-10 21:54 ` Borislav Petkov
2012-12-10 22:15 ` Zlatko Calusic
2012-12-10 22:15 ` Zlatko Calusic
2012-12-10 23:27 ` Hugh Dickins
2012-12-10 23:27 ` Hugh Dickins
2012-12-11 0:19 ` Zlatko Calusic
2012-12-11 21:56 ` Zlatko Calusic
2012-12-11 21:56 ` Zlatko Calusic
2012-12-19 22:24 ` Zlatko Calusic
2012-12-19 22:24 ` Zlatko Calusic
2012-12-10 18:29 ` Zlatko Calusic
2012-12-10 18:29 ` Zlatko Calusic
2012-12-06 8:09 ` Thorsten Leemhuis
2012-12-06 8:09 ` Thorsten Leemhuis
2012-11-27 21:29 ` Johannes Weiner
2012-11-27 21:29 ` Johannes Weiner
2012-11-28 13:35 ` Zdenek Kabelac
2012-11-28 13:35 ` Zdenek Kabelac
2012-11-28 14:04 ` Jiri Slaby
2012-11-28 14:04 ` Jiri Slaby
2012-11-28 9:45 ` Mel Gorman
2012-11-28 9:45 ` Mel Gorman
2012-12-03 15:23 ` Zdenek Kabelac
2012-12-03 15:23 ` Zdenek Kabelac
2012-12-03 19:18 ` Johannes Weiner
2012-12-03 19:18 ` Johannes Weiner
2012-12-04 9:05 ` Zdenek Kabelac
2012-12-04 9:05 ` Zdenek Kabelac
2012-12-04 9:15 ` Jiri Slaby
2012-12-04 9:15 ` Jiri Slaby
2012-12-04 16:11 ` Johannes Weiner
2012-12-04 16:11 ` Johannes Weiner
2012-12-04 16:22 ` Jiri Slaby
2012-12-04 16:22 ` Jiri Slaby
2012-12-04 19:50 ` Johannes Weiner
2012-12-04 19:50 ` Johannes Weiner
2012-12-08 10:35 ` Jiri Slaby
2012-12-08 10:35 ` Jiri Slaby
2012-12-04 16:15 ` Johannes Weiner
2012-12-04 16:15 ` Johannes Weiner
2012-12-06 13:51 ` Zdenek Kabelac
2012-12-06 13:51 ` Zdenek Kabelac
2012-12-03 13:14 ` Jiri Slaby
2012-12-03 13:14 ` Jiri Slaby
2012-12-04 8:55 ` Jiri Slaby
2012-12-04 8:55 ` Jiri Slaby
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