linux-kernel - Re: [RFC] ps command race fix

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Message-Id: <20060724184847.3ff6be7d.pj@sgi.com>
Date:	Mon, 24 Jul 2006 18:48:47 -0700
From:	Paul Jackson <pj@....com>
To:	Andrew Morton <akpm@...l.org>
Cc:	kamezawa.hiroyu@...fujitsu.com, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com
Subject: Re: [RFC] ps command race fix

Another possibility (perhaps a really stupid idea ;) would be to
snapshot the list of pids on the open, and let the readdir() just
access that fixed array.

The kernel/cpuset.c cpuset_tasks_open() routine that displays the
pids of tasks in a cpuset (the per-cpuset 'tasks' file) does this.

Then the seek and read and such semantics are nice and stable and
simple.

Throw out the snapshot on the last close.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.925.600.0401
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