From: Andrew Morton <akpm@linux-foundation.org>
To: Mel Gorman <mgorman@suse.de>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Minchan Kim <minchan.kim@gmail.com>,
Dave Jones <davej@redhat.com>, Jan Kara <jack@suse.cz>,
Andy Isaacson <adi@hexapodia.org>,
Johannes Weiner <jweiner@redhat.com>,
Rik van Riel <riel@redhat.com>, Nai Xia <nai.xia@gmail.com>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/11] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v6
Date: Fri, 16 Dec 2011 14:56:00 -0800 [thread overview]
Message-ID: <20111216145600.908fc77e.akpm@linux-foundation.org> (raw)
In-Reply-To: <1323877293-15401-1-git-send-email-mgorman@suse.de>
On Wed, 14 Dec 2011 15:41:22 +0000
Mel Gorman <mgorman@suse.de> wrote:
> Short summary: There are severe stalls when a USB stick using VFAT
> is used with THP enabled that are reduced by this series. If you are
> experiencing this problem, please test and report back and considering
> I have seen complaints from openSUSE and Fedora users on this as well
> as a few private mails, I'm guessing it's a widespread issue. This
> is a new type of USB-related stall because it is due to synchronous
> compaction writing where as in the past the big problem was dirty
> pages reaching the end of the LRU and being written by reclaim.
>
> Am cc'ing Andrew this time and this series would replace
> mm-do-not-stall-in-synchronous-compaction-for-thp-allocations.patch.
> I'm also cc'ing Dave Jones as he might have merged that patch to Fedora
> for wider testing and ideally it would be reverted and replaced by
> this series.
So it appears that the problem is painful for distros and users and
that we won't have this fixed until 3.2 at best, and that fix will be a
difficult backport for distributors of earlier kernels.
To serve those people better, I'm wondering if we should merge
mm-do-not-stall-in-synchronous-compaction-for-thp-allocations now, make
it available for -stable backport and then revert it as part of this
series? ie: give people a stopgap while we fix it properly?
next prev parent reply other threads:[~2011-12-16 22:56 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-14 15:41 [PATCH 0/11] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v6 Mel Gorman
2011-12-14 15:41 ` [PATCH 01/11] mm: compaction: Allow compaction to isolate dirty pages Mel Gorman
2011-12-14 15:41 ` [PATCH 02/11] mm: compaction: Use synchronous compaction for /proc/sys/vm/compact_memory Mel Gorman
2011-12-14 15:41 ` [PATCH 03/11] mm: vmscan: Check if we isolated a compound page during lumpy scan Mel Gorman
2011-12-15 23:21 ` Rik van Riel
2011-12-14 15:41 ` [PATCH 04/11] mm: vmscan: Do not OOM if aborting reclaim to start compaction Mel Gorman
2011-12-15 23:36 ` Rik van Riel
2011-12-14 15:41 ` [PATCH 05/11] mm: compaction: Determine if dirty pages can be migrated without blocking within ->migratepage Mel Gorman
2011-12-16 3:32 ` Rik van Riel
2011-12-16 23:20 ` Andrew Morton
2011-12-17 3:03 ` Nai Xia
2011-12-17 3:26 ` Andrew Morton
2011-12-19 11:05 ` Mel Gorman
2011-12-19 13:12 ` nai.xia
2011-12-14 15:41 ` [PATCH 06/11] mm: compaction: make isolate_lru_page() filter-aware again Mel Gorman
2011-12-16 3:34 ` Rik van Riel
2011-12-18 1:53 ` Minchan Kim
2011-12-14 15:41 ` [PATCH 07/11] mm: page allocator: Do not call direct reclaim for THP allocations while compaction is deferred Mel Gorman
2011-12-16 4:10 ` Rik van Riel
2011-12-14 15:41 ` [PATCH 08/11] mm: compaction: Introduce sync-light migration for use by compaction Mel Gorman
2011-12-16 4:31 ` Rik van Riel
2011-12-18 2:05 ` Minchan Kim
2011-12-19 11:45 ` Mel Gorman
2011-12-20 7:18 ` Minchan Kim
2012-01-13 21:25 ` Andrew Morton
2012-01-16 11:33 ` Mel Gorman
2011-12-14 15:41 ` [PATCH 09/11] mm: vmscan: When reclaiming for compaction, ensure there are sufficient free pages available Mel Gorman
2011-12-16 4:35 ` Rik van Riel
2011-12-14 15:41 ` [PATCH 10/11] mm: vmscan: Check if reclaim should really abort even if compaction_ready() is true for one zone Mel Gorman
2011-12-16 4:38 ` Rik van Riel
2011-12-16 11:29 ` Mel Gorman
2011-12-14 15:41 ` [PATCH 11/11] mm: Isolate pages for immediate reclaim on their own LRU Mel Gorman
2011-12-16 4:47 ` Rik van Riel
2011-12-16 12:26 ` Mel Gorman
2011-12-16 15:17 ` Johannes Weiner
2011-12-16 16:07 ` Mel Gorman
2011-12-19 16:14 ` Johannes Weiner
2011-12-17 16:08 ` Minchan Kim
2011-12-19 13:26 ` Mel Gorman
2011-12-20 7:10 ` Minchan Kim
2011-12-20 9:55 ` Mel Gorman
2011-12-23 19:08 ` Hugh Dickins
2011-12-29 16:59 ` Mel Gorman
2011-12-29 19:31 ` Rik van Riel
2011-12-30 11:27 ` Mel Gorman
2011-12-16 22:56 ` Andrew Morton [this message]
2011-12-19 14:40 ` [PATCH 0/11] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v6 Mel Gorman
2011-12-16 23:37 ` Andrew Morton
2011-12-19 14:20 ` Mel Gorman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20111216145600.908fc77e.akpm@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=aarcange@redhat.com \
--cc=adi@hexapodia.org \
--cc=davej@redhat.com \
--cc=jack@suse.cz \
--cc=jweiner@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=minchan.kim@gmail.com \
--cc=nai.xia@gmail.com \
--cc=riel@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).