From: Tejun Heo <tj@kernel.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org, Johannes Weiner <hannes@cmpxchg.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Anton Vorontsov <anton.vorontsov@linaro.org>
Subject: Re: [PATCH 2/3] memcg: Limit the number of events registered on oom_control
Date: Wed, 7 Aug 2013 10:01:03 -0400 [thread overview]
Message-ID: <20130807140103.GH27006@htj.dyndns.org> (raw)
In-Reply-To: <20130807135734.GK8184@dhcp22.suse.cz>
On Wed, Aug 07, 2013 at 03:57:34PM +0200, Michal Hocko wrote:
> On Wed 07-08-13 09:47:41, Tejun Heo wrote:
> > Hello,
> >
> > On Wed, Aug 07, 2013 at 03:37:46PM +0200, Michal Hocko wrote:
> > > > It isn't different from listening from epoll, for example.
> > >
> > > epoll limits the number of watchers, no?
> >
> > Not that I know of. It'll be limited by max open fds but I don't
> > think there are other limits.
>
> max_user_watches seems to be a limit (4% of lowmem in maximum).
That's per *user* not per event source. The problem here is creating
a global (across securit domains) resource shared by all users.
--
tejun
--
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:[~2013-08-07 14:01 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-07 11:28 [PATCH 1/3] memcg: limit the number of thresholds per-memcg Michal Hocko
2013-08-07 11:28 ` [PATCH 2/3] memcg: Limit the number of events registered on oom_control Michal Hocko
2013-08-07 13:08 ` Tejun Heo
2013-08-07 13:11 ` Tejun Heo
2013-08-07 13:37 ` Michal Hocko
2013-08-07 13:47 ` Tejun Heo
2013-08-07 13:57 ` Michal Hocko
2013-08-07 14:01 ` Tejun Heo [this message]
2013-08-07 14:47 ` Michal Hocko
2013-08-07 17:30 ` Michal Hocko
2013-08-09 0:46 ` Tejun Heo
2013-08-07 11:28 ` [PATCH 3/3] vmpressure: limit the number of registered events Michal Hocko
2013-08-07 13:22 ` [PATCH 1/3] memcg: limit the number of thresholds per-memcg Tejun Heo
2013-08-07 13:46 ` Michal Hocko
2013-08-07 13:58 ` Tejun Heo
2013-08-07 14:37 ` Michal Hocko
2013-08-07 22:05 ` Kirill A. Shutemov
2013-08-08 14:43 ` Michal Hocko
2013-08-09 0:50 ` Tejun Heo
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=20130807140103.GH27006@htj.dyndns.org \
--to=tj@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=anton.vorontsov@linaro.org \
--cc=cgroups@vger.kernel.org \
--cc=hannes@cmpxchg.org \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=kirill@shutemov.name \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.cz \
/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).