linux-kernel - Re: [RFC PATCH] Report the shmid backing a VMA in maps

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Message-ID: <20081004215228.GA20048@x200.localdomain>
Date:	Sun, 5 Oct 2008 01:52:28 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Mel Gorman <mel@....ul.ie>, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Adam Litke <agl@...ibm.com>
Subject: Re: [RFC PATCH] Report the shmid backing a VMA in maps

On Sat, Oct 04, 2008 at 09:04:03PM +0900, KOSAKI Motohiro wrote:
> In the other hand, huge page is often used via ipc shm, not mmap.
> So, administrator often want to know relationship of memory region and shmid.
> 
> Then, To add shmid attribute in /proc/{pid}/maps is useful.
> 
> 
> In addition, shmid information is not only useful for huge page, but also for normal shm.
> Then, this patch works well on normal shm.

> 2000000000500000-2000000000900000 rw-s 00000000 00:09 0                  /SYSV00000000 (deleted) (shmid=0)
> 2000000000900000-2000000000d00000 rw-s 00000000 00:09 32769              /SYSV00000000 (deleted) (shmid=32769)
							^^^^^						  ^^^^^

shmid is already in place, and no, it's not a coincidence ;-)
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