linux-kernel - Re: How to find out how many other processes share VM with $PID?

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Message-ID: <20070827121354.GA5616@mail.ustc.edu.cn>
Date:	Mon, 27 Aug 2007 20:13:54 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to find out how many other processes share VM with $PID?

Hi Denys,

On Mon, Aug 27, 2007 at 12:56:31PM +0100, Denys Vlasenko wrote:
> Hi,
> 
> I was a bit frustrated by bad quality of memory usage info
> from top and ps, and decided to write my own utility.
> 
> One problem I don't know how to solve is how to avoid counting
> twice (or more) memory used by processes which share VM
> (by use of CLONE_VM flage to sys_clone).
> 
> I know how to detect and correctly account for threads
> (processes created with CLONE_THREAD), but how to detect non-threads
> with shared VM?

There is a nice LWN article on this issue:
        ELC: How much memory are applications really using?
        http://lwn.net/Articles/230975/

Another helpful patch could be:
        maps: PSS(proportional set size) accounting in smaps
        http://lkml.org/lkml/2007/8/19/23

Fengguang

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