linux-kernel - Re: [patch] drop epoll max_user_instances and rely only on max_user

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Message-ID: <cfd18e0f0901290203r139cb5bfgc02a0dcb1347aba8@mail.gmail.com>
Date:	Thu, 29 Jan 2009 23:03:37 +1300
From:	Michael Kerrisk <mtk.manpages@...glemail.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>, Willy Tarreau <w@....eu>,
	Bron Gondwana <brong@...tmail.fm>
Subject: Re: [patch] drop epoll max_user_instances and rely only on 
	max_user_watches

On Thu, Jan 29, 2009 at 9:57 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
>
>> Subject: [patch] drop epoll max_user_instances and rely only on max_user_watches
>
> nanonit: please prepare titles in the form "subsystem-id:
> what-i-did-to-it", so a suitable name here would be
>
>        epoll: drop max_user_instances and rely only on max_user_watches
>
> On Wed, 28 Jan 2009 20:56:07 -0800 (PST) Davide Libenzi <davidel@...ilserver.org> wrote:
>
>> Linus suggested to put limits where the money is, and max_user_watches
>> already does that w/out the need of max_user_instances. That has the
>> advantage to mitigate the potential DoS while allowing pretty generous
>> default behavior.

[...]

> I assume that because you based all this on all the other patches, you
> view it as 2.6.30 material?

Since max_user_instances was added in 2.6.28, and this is an ABI
change, I suggest this should go into .29-rc, so that
max_user_instances spends as little time in the wild as possible.

Cheers,

Michael

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git
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