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

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Message-ID: <alpine.DEB.1.10.0901311748350.18888@alien.or.mcafeemobile.com>
Date:	Sat, 31 Jan 2009 17:49:05 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	mtk.manpages@...il.com
cc:	Andrew Morton <akpm@...ux-foundation.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 Sun, 1 Feb 2009, Michael Kerrisk wrote:

> Hi Davide,
> 
> On Sun, Feb 1, 2009 at 2:30 PM, Davide Libenzi <davidel@...ilserver.org> wrote:
> > On Sun, 1 Feb 2009, Michael Kerrisk wrote:
> >
> >> Hi Davide,
> >>
> >> On Fri, Jan 30, 2009 at 7:54 AM, Davide Libenzi <davidel@...ilserver.org> wrote:
> >> > On Thu, 29 Jan 2009, Michael Kerrisk wrote:
> >> >
> >> >> 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.
> >> >
> >> > Agreed, like I already told Andrew. Sorry Michael for the double change to
> >> > the man page :/
> >>
> >> So is the right change to the epoll(7) page (see
> >> http://www.kernel.org/doc/man-pages/online/pages/man7/epoll.7.html )
> >> to simply remive the text on max_user_instances:
> >>
> >>        /proc/sys/fs/epoll/max_user_instances (since Linux 2.6.28)
> >>               This  specifies  an  upper  limit on the number of epoll
> >>               instances that can be created per real user ID.
> >>
> >> Or are other changes also required?
> >
> > Yes. Plus, max_user_watches, instead of being 1/32 of lowmem, it's 4%.
> > Just a detail.
> 
> Would you please review the following patch, which comments out the
> text for max_user_instances, and updates the numbers for
> max_user-watches.

Thank you Michael, looks fine to me.


- Davide


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