linux-kernel - Re: [PATCH] show per-process swap usage via procfs

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Message-ID: <2f11576a0911050641j8799c5kbd390116edcc566d@mail.gmail.com>
Date:	Thu, 5 Nov 2009 23:41:50 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>,
	cl@...ux-foundation.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] show per-process swap usage via procfs

2009/11/4 KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>:
>
> Passed several tests and one bug was fixed since RFC version.
> This patch is against mmotm.
> =
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...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@...fujitsu.com>
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