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

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Date:	Mon, 17 Aug 2009 16:34:04 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Amerigo Wang <xiyou.wangcong@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Tatsuhiro Aoshima <tatsu.pc@...il.com>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	albert@...rs.sf.net
Subject: Re: [PATCH] proc: let task status file print utime and stime.

On Mon, Aug 17, 2009 at 03:32:53PM +0900, KAMEZAWA Hiroyuki wrote:
>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.


Hmm, for me it looks like that 'ps' should be fixed...

I haven't checked the source code of 'ps', but I don't think
this is O(n) if '-p' is specified. If we just use something
like 'test -d /proc/<pid>' it would be O(1).


>
>> 
>> 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.


Done. Albert?


>
>
>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 don't know... :( I still prefer to use 'ps'.
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