linux-kernel - Re: [patch 016/104] epoll: introduce resource usage limits

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Message-ID: <20090125122039.GA16603@brong.net>
Date:	Sun, 25 Jan 2009 23:20:39 +1100
From:	Bron Gondwana <brong@...tmail.fm>
To:	Bron Gondwana <brong@...tmail.fm>
Cc:	Greg KH <gregkh@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable@...nel.org, Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>
Subject: Re: [patch 016/104] epoll: introduce resource usage limits

On Sun, Jan 25, 2009 at 10:01:27PM +1100, Bron Gondwana wrote:
> On Sun, Jan 25, 2009 at 12:03:34AM +1100, Bron Gondwana wrote:
> > The attached patches do this - the first bumps the default to 1024, and
> > the second adds /proc/sys/fs/epoll/limits which contains 4 values.  The
> > first two are the maximum current value for each field, and the second
> > two are the values of max_user_instances and max_user_watches again,
> > similar to the file-max interface.
> 
> And this third one (on top of the other two) adds the UIDs of the most
> heavily using users to the "limits" file, to help you track them down.

Patch 4 - I'll stop now ;)

Allow '0' for unlimited for both limits.

I notice that root gets limited same as anyone else.  Any opinion on
special-casing root and not limiting the number of epolls they can
create?  There are plenty of other ways root can be nasty if it's so
inclined!

Bron.

View attachment "0004-epoll-allow-0-for-unlimited-on-epoll-limits.patch" of type "text/x-diff" (1343 bytes)