From: Michal Hocko <mhocko@suse.cz>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Christoph Hellwig <hch@infradead.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>, Rik van Riel <riel@redhat.com>,
Michel Lespinasse <walken@google.com>,
Mel Gorman <mgorman@suse.de>, Lutz Vieweg <lvml@5t9.de>
Subject: Re: [PATCH] memcg: unlock page before charging it. (WasRe: [PATCH V2] mm: Do not keep page locked during page fault while charging it for memcg
Date: Thu, 23 Jun 2011 11:02:04 +0200 [thread overview]
Message-ID: <20110623090204.GE31593@tiehlicka.suse.cz> (raw)
In-Reply-To: <20110623170811.16f4435f.kamezawa.hiroyu@jp.fujitsu.com>
On Thu 23-06-11 17:08:11, KAMEZAWA Hiroyuki wrote:
> On Thu, 23 Jun 2011 09:41:33 +0200
> Michal Hocko <mhocko@suse.cz> wrote:
[...]
> > Other than that:
> > Reviewed-by: Michal Hocko <mhocko@suse.cz>
> >
>
> I found the page is added to LRU before charging. (In this case,
> memcg's LRU is ignored.) I'll post a new version with a fix.
Yes, you are right. I have missed that.
This means that we might race with reclaim which could evict the COWed
page wich in turn would uncharge that page even though we haven't
charged it yet.
Can we postpone page_add_new_anon_rmap to the charging path or it would
just race somewhere else?
--
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9
Czech Republic
--
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:[~2011-06-23 9:02 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-22 12:06 [PATCH] " Michal Hocko
2011-06-22 12:15 ` Christoph Hellwig
2011-06-22 12:32 ` [PATCH V2] " Michal Hocko
2011-06-23 6:08 ` [PATCH] memcg: unlock page before charging it. (WasRe: " KAMEZAWA Hiroyuki
2011-06-23 7:23 ` Daisuke Nishimura
2011-06-23 7:41 ` Michal Hocko
2011-06-23 8:08 ` KAMEZAWA Hiroyuki
2011-06-23 9:02 ` Michal Hocko [this message]
2011-06-23 10:01 ` [PATCH] mm: preallocate page before lock_page at filemap COW. " KAMEZAWA Hiroyuki
2011-06-23 11:58 ` Michal Hocko
2011-06-23 13:01 ` Hiroyuki Kamezawa
2011-06-23 13:23 ` Michal Hocko
2011-06-23 13:51 ` Hiroyuki Kamezawa
2011-06-24 7:57 ` Michal Hocko
2011-06-24 11:46 ` Hiroyuki Kamezawa
2011-07-12 9:48 ` Michal Hocko
2012-01-26 10:46 ` Lutz Vieweg
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=20110623090204.GE31593@tiehlicka.suse.cz \
--to=mhocko@suse.cz \
--cc=akpm@linux-foundation.org \
--cc=hch@infradead.org \
--cc=hughd@google.com \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lvml@5t9.de \
--cc=mgorman@suse.de \
--cc=riel@redhat.com \
--cc=walken@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