From: Minchan Kim <minchan.kim@gmail.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Linux-MM <linux-mm@kvack.org>,
Andrea Arcangeli <aarcange@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>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 6/7] mm: page allocator: Limit when direct reclaim is used when compaction is deferred
Date: Wed, 23 Nov 2011 02:50:55 +0900 [thread overview]
Message-ID: <20111122175055.GE15253@barrios-laptop.redhat.com> (raw)
In-Reply-To: <1321900608-27687-7-git-send-email-mgorman@suse.de>
On Mon, Nov 21, 2011 at 06:36:47PM +0000, Mel Gorman wrote:
> If compaction is deferred, we enter direct reclaim to try reclaim the
> pages that way. For small high-orders, this has a reasonable chance
> of success. However, if the caller as specified __GFP_NO_KSWAPD to
> limit the disruption to the system, it makes more sense to fail the
> allocation rather than stall the caller in direct reclaim. This patch
> will skip direct reclaim if compaction is deferred and the caller
> specifies __GFP_NO_KSWAPD.
>
> Async compaction only considers a subset of pages so it is possible for
> compaction to be deferred prematurely and not enter direct reclaim even
> in cases where it should. To compensate for this, this patch also defers
> compaction only if sync compaction failed.
>
> Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Minchan Kim <minchan.kim@gmail.com>
It does make sense to me.
--
Kind regards,
Minchan Kim
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-11-22 17:51 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 18:36 [RFC PATCH 0/7] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v4r2 Mel Gorman
2011-11-21 18:36 ` [PATCH 1/7] mm: compaction: Allow compaction to isolate dirty pages Mel Gorman
2011-11-22 16:58 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 2/7] mm: compaction: Use synchronous compaction for /proc/sys/vm/compact_memory Mel Gorman
2011-11-22 17:00 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 3/7] mm: check if we isolated a compound page during lumpy scan Mel Gorman
2011-11-22 17:05 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 4/7] mm: compaction: Determine if dirty pages can be migrated without blocking within ->migratepage Mel Gorman
2011-11-21 18:36 ` [PATCH 5/7] mm: compaction: make isolate_lru_page() filter-aware again Mel Gorman
2011-11-22 17:30 ` Minchan Kim
2011-11-23 9:19 ` Mel Gorman
2011-11-21 18:36 ` [PATCH 6/7] mm: page allocator: Limit when direct reclaim is used when compaction is deferred Mel Gorman
2011-11-22 17:50 ` Minchan Kim [this message]
2011-11-21 18:36 ` [PATCH 7/7] mm: compaction: Introduce sync-light migration for use by compaction Mel Gorman
2011-11-22 6:56 ` Shaohua Li
2011-11-22 10:14 ` Mel Gorman
2011-11-22 11:54 ` Jan Kara
2011-11-22 13:59 ` Nai Xia
2011-11-22 15:07 ` Nai Xia
2011-11-22 19:13 ` Jan Kara
2011-11-22 22:44 ` Nai Xia
2011-11-23 11:39 ` Jan Kara
2011-11-23 12:20 ` Nai Xia
2011-11-23 2:01 ` Nai Xia
2011-11-23 2:25 ` Shaohua Li
2011-11-23 11:00 ` Mel Gorman
2011-11-23 12:51 ` Nai Xia
2011-11-23 13:05 ` Nai Xia
2011-11-23 13:45 ` Mel Gorman
2011-11-23 14:35 ` Nai Xia
2011-11-23 15:08 ` Mel Gorman
2011-11-23 15:23 ` Nai Xia
2011-11-23 15:57 ` 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=20111122175055.GE15253@barrios-laptop.redhat.com \
--to=minchan.kim@gmail.com \
--cc=aarcange@redhat.com \
--cc=adi@hexapodia.org \
--cc=jack@suse.cz \
--cc=jweiner@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--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