linux-kernel - Re: [Patch] proc: fill 'lib' field in /proc/<pid>/statm

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Message-ID: <Pine.LNX.4.64.0912071101530.29718@sister.anvils>
Date:	Mon, 7 Dec 2009 11:19:44 +0000 (GMT)
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	Amerigo Wang <amwang@...hat.com>
cc:	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, stable@...nel.org,
	akpm@...ux-foundation.org, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [Patch] proc: fill 'lib' field in /proc/<pid>/statm

On Mon, 7 Dec 2009, Amerigo Wang wrote:

> Currently, the 'lib' field of /proc/<pid>/statm is
> always 0, we should fill it with the right value,
> the same with 'VmLib'.

The right value (if you're looking for consistency with Linux 2.4)
is the number of currently resident "library" pages: and we don't
know that number - we can't even define what a library is.

We could add some code to make it show the same bogus number as
we show somewhere else, but it has said 0 ever since 2.5.37: so
I don't think it's worth a line of code myself, but bow to others.

> 
> Signed-off-by: WANG Cong <amwang@...hat.com>
> Cc: Eric W. Biederman <ebiederm@...ssion.com>
> Cc: Alexey Dobriyan <adobriyan@...il.com>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Mel Gorman <mel@....ul.ie>
> Cc: stable@...nel.org

What does alarm me is that you think this is fit for -stable!

Hugh
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