Re: [PATCH 2/3] memcg: Limit the number of events registered onoom_control

[Tejun Heo]

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
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