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

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Message-Id: <20090817153253.52bf9c69.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 17 Aug 2009 15:32:53 +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 14:32:02 +0800
Amerigo Wang <xiyou.wangcong@...il.com> wrote:

> On Mon, Aug 17, 2009 at 03:22:06PM +0900, KAMEZAWA Hiroyuki wrote:
> >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.
> 
> Sure, we already have '-p' for 'ps', e.g.
> 
>  ps -p 1 -o pid,user,comm
> 
> Enjoy. :-)
I said it's verrrrry slow.

> 
> Anyway, I would like to see 'ps' to have 'utime,stime' field, on
> my machine, its output for 'utime,stime' looks wrong.
> 
> Maybe we should Cc procps developers?
ya, maybe. it's good to be CCed.


BTW, why all other status
Name:   cat
State:  R (running)
Tgid:   7068
Pid:    7068
PPid:   6115
TracerPid:      0
Uid:    500     500     500     500
Gid:    500     500     500     500
FDSize: 256
Groups: 500

are allowed to be duplicated ?

I bet stime.utime will be used more often than TracerPid/FDSize/ ;)

Thanks,
-Kame


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