linux-kernel - RE: [PATCH 1/1] proc: add /proc/pid/shmaps

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Message-ID: <9E0BE1322F2F2246BD820DA9FC397ADE37A530@SHSMSX102.ccr.corp.intel.com>
Date:	Thu, 9 Aug 2012 00:49:27 +0000
From:	"Ren, Qiaowei" <qiaowei.ren@...el.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Hugh Dickins <hughd@...gle.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] proc: add /proc/pid/shmaps

Thanks for your reply. There are so many contents in /proc/pid/maps, and usually only a very small minority of those are about shared memory in address space of every process. So I hope that a new file maybe provide some convenience. Could you tell me how to get such information except analyzing 'maps' file?

-----Original Message-----
From: David Rientjes [mailto:rientjes@...gle.com] 
Sent: Thursday, August 09, 2012 5:10 AM
To: Ren, Qiaowei
Cc: Andrew Morton; Al Viro; Oleg Nesterov; Cyrill Gorcunov; Vasiliy Kulikov; Hugh Dickins; Naoya Horiguchi; Konstantin Khlebnikov; linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] proc: add /proc/pid/shmaps

On Wed, 8 Aug 2012, Qiaowei Ren wrote:

> Add a shmaps entry to /proc/pid: show information about shared memory in an address space.
> 
> People that use shared memory and want to perform an analyzing about it. For example, judge whether any memory address is shared. This file just contains 'share' part of /proc/pid/maps now. There are too many contents in maps, and so we have to do a lot of analysis to obtain relative information every time.
> 
> Signed-off-by: Qiaowei Ren <qiaowei.ren@...el.com>

Nack as unnecessary; /proc/pid/maps already explicitly emits 's' for VM_MAYSHARE and 'p' otherwise so this information is already available to userspace.
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