To: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] add "VmUsers: N" to /proc/$PID/status
In-Reply-To: Your message of "Wed, 15 Jul 2009 03:22:18 +0200."
             <200907150322.18123.vda.linux@googlemail.com>
From: Valdis.Kletnieks@vt.edu
References: <200907150322.18123.vda.linux@googlemail.com>
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Date: Thu, 16 Jul 2009 15:46:40 -0400
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On Wed, 15 Jul 2009 03:22:18 +0200, Denys Vlasenko said:

> It can be nice to know how many such CLONE_VM'ed processes
> share VM with given /proc/PID. Then it would be possible to do
> more accurate accounting of memory usage. Say, by dividing
> all memory usage numbers of this process by this number.

Process A clones a process A1.  Process B clones a process B1. Now
all 4 of them have 'VmUsers: 2' on them, but there's no clean way to tell
whether A1 or B1 is the one sharing with A, or with B.

The patch is probably sufficient if all you want is some N to divide by, but
not if you care *which* processes are sharing how much.

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