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Date: Thu, 5 Nov 2009 23:41:50 +0900
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Subject: Re: [PATCH] show per-process swap usage via procfs
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "linux-mm@kvack.org" <linux-mm@kvack.org>,
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2009/11/4 KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>:
>
> Passed several tests and one bug was fixed since RFC version.
> This patch is against mmotm.
> =
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
>
> Now, anon_rss and file_rss is counted as RSS and exported via /proc.
> RSS usage is important information but one more information which
> is often asked by users is "usage of swap".(user support team said.)
>
> This patch counts swap entry usage per process and show it via
> /proc/<pid>/status. I think status file is robust against new entry.
> Then, it is the first candidate..
>
> ?After this, /proc/<pid>/status includes following line
> ?<snip>
> ?VmPeak: ? 315360 kB
> ?VmSize: ? 315360 kB
> ?VmLck: ? ? ? ? 0 kB
> ?VmHWM: ? ?180452 kB
> ?VmRSS: ? ?180452 kB
> ?VmData: ? 311624 kB
> ?VmStk: ? ? ? ?84 kB
> ?VmExe: ? ? ? ? 4 kB
> ?VmLib: ? ? ?1568 kB
> ?VmPTE: ? ? ? 640 kB
> ?VmSwap: ? 131240 kB <=== new information
>
> Note:
> ?Because this patch catches swap_pte on page table, this will
> ?not catch shmem's swapout. It's already accounted in per-shmem
> ?inode and we don't need to do more.

Sidenote: top(1) can show SWAP usage. but it is crazy buggy
implementation. it define
VIRT = SWAP + RES (see man top or actual source code). this patch help
to fix its insane
calculation.

    Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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