linux-kernel - Re: [Patch] Convert max_user

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Message-Id: <20101027164502.d6e2068d.akpm@linux-foundation.org>
Date:	Wed, 27 Oct 2010 16:45:02 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Robin Holt <holt@....com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [Patch] Convert max_user_watches to long.

On Wed, 27 Oct 2010 14:09:15 -0500
Robin Holt <holt@....com> wrote:

> On a 16TB machine, max_user_watches has an integer overflow.  Convert it
> to use a long and handle the associated fallout.
> 

hand-wavy reality check:

Are the existing defaults sane?  How well does the code perform with a
few billion watches?

Is the expected use case one-watch-per-user-per-fd?  If so, then
perhaps the max number of user_watches should have some realtionship
with the max number of fds?

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