From: Johannes Weiner <hannes@cmpxchg.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: Tim Chen <tim.c.chen@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Minchan Kim <minchan@kernel.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
"andi.kleen" <andi.kleen@intel.com>,
linux-mm <linux-mm@kvack.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Cgroup: Fix memory accounting scalability in shrink_page_list
Date: Fri, 20 Jul 2012 16:16:25 +0200 [thread overview]
Message-ID: <20120720141625.GA1426@cmpxchg.org> (raw)
In-Reply-To: <20120720135329.GA12440@tiehlicka.suse.cz>
On Fri, Jul 20, 2012 at 03:53:29PM +0200, Michal Hocko wrote:
> On Thu 19-07-12 16:34:26, Tim Chen wrote:
> [...]
> > diff --git a/mm/vmscan.c b/mm/vmscan.c
> > index 33dc256..aac5672 100644
> > --- a/mm/vmscan.c
> > +++ b/mm/vmscan.c
> > @@ -779,6 +779,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> >
> > cond_resched();
> >
> > + mem_cgroup_uncharge_start();
> > while (!list_empty(page_list)) {
> > enum page_references references;
> > struct address_space *mapping;
>
> Is this safe? We have a scheduling point few lines below. What prevents
> from task move while we are in the middle of the batch?
The batch is accounted in task_struct, so moving a batching task to
another CPU shouldn't be a problem.
--
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/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2012-07-20 14:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-19 23:34 [PATCH] Cgroup: Fix memory accounting scalability in shrink_page_list Tim Chen
2012-07-20 3:19 ` Kamezawa Hiroyuki
2012-07-20 4:25 ` Minchan Kim
2012-07-20 16:38 ` Tim Chen
2012-07-20 6:27 ` Johannes Weiner
2012-07-20 11:19 ` Kirill A. Shutemov
2012-07-20 13:53 ` Michal Hocko
2012-07-20 14:16 ` Johannes Weiner [this message]
2012-07-20 14:38 ` Michal Hocko
2012-07-20 15:12 ` Johannes Weiner
2012-07-20 16:31 ` Michal Hocko
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=20120720141625.GA1426@cmpxchg.org \
--to=hannes@cmpxchg.org \
--cc=akpm@linux-foundation.org \
--cc=andi.kleen@intel.com \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mel@csn.ul.ie \
--cc=mhocko@suse.cz \
--cc=minchan@kernel.org \
--cc=tim.c.chen@linux.intel.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).