From: Rik van Riel <riel@redhat.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Konstantin Khlebnikov <khlebnikov@openvz.org>,
Hugh Dickins <hughd@google.com>, Ying Han <yinghan@google.com>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/3] Removal of lumpy reclaim V2
Date: Wed, 11 Apr 2012 14:06:11 -0400 [thread overview]
Message-ID: <4F85C813.2050206@redhat.com> (raw)
In-Reply-To: <20120411175215.GI3789@suse.de>
On 04/11/2012 01:52 PM, Mel Gorman wrote:
> On Wed, Apr 11, 2012 at 01:17:02PM -0400, Rik van Riel wrote:
>> Next step: get rid of __GFP_NO_KSWAPD for THP, first
>> in the -mm kernel
>>
>
> Initially the flag was introduced because kswapd reclaimed too
> aggressively. One would like to believe that it would be less of a problem
> now but we must avoid a situation where the CPU and reclaim cost of kswapd
> exceeds the benefit of allocating a THP.
Since kswapd and the direct reclaim code now use
the same conditionals for calling compaction,
the cost ought to be identical.
I agree this is something we should shake out
in -mm for a while though, before considering a
mainline merge.
Andrew, would you be willing to take a removal
of __GFP_NO_KSWAPD in -mm, and push it to Linus
for the 3.6 kernel if no ill effects are seen
in -mm and -next?
--
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:[~2012-04-11 18:56 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-11 16:38 [PATCH 0/3] Removal of lumpy reclaim V2 Mel Gorman
2012-04-11 16:38 ` [PATCH 1/3] mm: vmscan: Remove lumpy reclaim Mel Gorman
2012-04-11 17:25 ` Rik van Riel
2012-04-11 18:54 ` KOSAKI Motohiro
2012-04-11 16:38 ` [PATCH 2/3] mm: vmscan: Do not stall on writeback during memory compaction Mel Gorman
2012-04-11 17:26 ` Rik van Riel
2012-04-11 18:51 ` KOSAKI Motohiro
2012-04-11 16:38 ` [PATCH 3/3] mm: vmscan: Remove reclaim_mode_t Mel Gorman
2012-04-11 17:26 ` Rik van Riel
2012-04-11 19:48 ` KOSAKI Motohiro
2012-04-11 17:17 ` [PATCH 0/3] Removal of lumpy reclaim V2 Rik van Riel
2012-04-11 17:52 ` Mel Gorman
2012-04-11 18:06 ` Rik van Riel [this message]
2012-04-12 9:32 ` Mel Gorman
2012-04-11 23:37 ` Ying Han
2012-04-12 5:49 ` Mel Gorman
2012-04-11 23:54 ` Hugh Dickins
2012-04-12 5:44 ` 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=4F85C813.2050206@redhat.com \
--to=riel@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=hughd@google.com \
--cc=khlebnikov@openvz.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=yinghan@google.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).