From: Johannes Weiner <hannes@cmpxchg.org>
To: Ying Han <yinghan@google.com>
Cc: Michal Hocko <mhocko@suse.cz>, Mel Gorman <mel@csn.ul.ie>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Rik van Riel <riel@redhat.com>, Hillf Danton <dhillf@gmail.com>,
Hugh Dickins <hughd@google.com>,
Dan Magenheimer <dan.magenheimer@oracle.com>,
linux-mm@kvack.org
Subject: Re: [PATCH V2 5/5] memcg: change the target nr_to_reclaim for each memcg under kswapd
Date: Thu, 12 Apr 2012 01:56:38 +0200 [thread overview]
Message-ID: <20120411235638.GA1787@cmpxchg.org> (raw)
In-Reply-To: <1334181627-26942-1-git-send-email-yinghan@google.com>
On Wed, Apr 11, 2012 at 03:00:27PM -0700, Ying Han wrote:
> Under global background reclaim, the sc->nr_to_reclaim is set to
> ULONG_MAX. Now we are iterating all memcgs under the zone and we
> shouldn't pass the pressure from kswapd for each memcg.
>
> After all, the balance_pgdat() breaks after reclaiming SWAP_CLUSTER_MAX
> pages to prevent building up reclaim priorities.
shrink_mem_cgroup_zone() bails out of a zone, balance_pgdat() bails
out of a priority loop, there is quite a difference.
After this patch, kswapd no longer puts equal pressure on all zones in
the zonelist, which was a key reason why we could justify bailing
early out of individual zones in direct reclaim: kswapd will restore
fairness.
--
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 23:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-11 22:00 [PATCH V2 5/5] memcg: change the target nr_to_reclaim for each memcg under kswapd Ying Han
2012-04-11 23:56 ` Johannes Weiner [this message]
2012-04-12 4:06 ` Ying Han
2012-04-12 14:24 ` Johannes Weiner
2012-04-12 16:45 ` Ying Han
2012-04-12 17:44 ` Johannes Weiner
2012-04-12 17:58 ` Ying Han
2012-04-15 1:57 ` Hillf Danton
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=20120411235638.GA1787@cmpxchg.org \
--to=hannes@cmpxchg.org \
--cc=dan.magenheimer@oracle.com \
--cc=dhillf@gmail.com \
--cc=hughd@google.com \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=linux-mm@kvack.org \
--cc=mel@csn.ul.ie \
--cc=mhocko@suse.cz \
--cc=riel@redhat.com \
--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).