linux-kernel - Re: [PATCH] proc: let task status file print utime and stime.

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Message-Id: <20090817152206.50c35330.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 17 Aug 2009 15:22:06 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Amerigo Wang <xiyou.wangcong@...il.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Tatsuhiro Aoshima <tatsu.pc@...il.com>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH] proc: let task status file print utime and stime.

On Mon, 17 Aug 2009 14:18:21 +0800
Amerigo Wang <xiyou.wangcong@...il.com> wrote:

> Ah... in fact, I expected 'ps' can report this, however, surprisingly
> it doesn't have this, at least not what I expect (unless I miss
> something obvious).
> 
> 
> >
> >In another thinking, in old days, /proc/<pid>/stat was enough because most of
> >users uses scanf() or some C langage to read fixed-format data.
> >/proc/<pid>/status is useful for some script languages which has 
> >good parser per line. 
> >
> 
> Well... I think this work should be left to 'ps', e.g.
> 
>   ps -o pid,utime,stime
> 
> 'ps' is responsible to read /proc/<pid>/stat for the user.
> 
Hmm, personally, I don't like 'ps' and its unified filter.

When I want to know status of a process of PID,
# ps -o pid,utime,stime  PID

'ps' scans *all* process and filter PID. (try #strace ps)
I like checking /proc/<pid>/<something> without 'ps' in an environment
where thousands of processes runs.

Thanks,
-Kame

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