linux-kernel - Re: [PATCH] proc: readdir race fix.

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Message-Id: <20060905114139.3af9254a.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 5 Sep 2006 11:41:39 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	ebiederm@...ssion.com, linux-kernel@...r.kernel.org, akpm@...l.org,
	saito.tadashi@...t.fujitsu.com, ak@...e.de, oleg@...sign.ru,
	jdelvare@...e.de
Subject: Re: [PATCH] proc: readdir race fix.

On Tue, 5 Sep 2006 10:30:10 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> Hi,
> 
> On Mon, 04 Sep 2006 17:13:10 -0600
> ebiederm@...ssion.com (Eric W. Biederman) wrote:
> > These better semantics are implemented by scanning through the
> > pids in numerical order and by making the file offset a pid
> > plus a fixed offset.
> I think this is very sane/solid approach.
> Maybe this is the way to go. I'll test and ack later, thank you.
> 
Just a memo:

One interesting aspect of this patch is..

- default result of ps with current(old) kernel is naturally sorted by  starttime.
  then, ps command itself comes at the bottom of the result, as the newest process.

- default result of ps with this patch is sorted by pid, regardless of starttime.

==
kamezawa  3770  0.0  0.0  5156  996 tty1     S+   11:17   0:00 /bin/bash ./testp
kawamura  3989  0.0  0.0  2168  832 pts/3    S+   11:32   0:00 sh -c (cd /usr/sh
kawamura  3990  0.0  0.0  2168  408 pts/3    S+   11:32   0:00 sh -c (cd /usr/sh
kawamura  4002  0.0  0.0  1924  680 pts/3    S+   11:32   0:00 /usr/bin/less -iR
root     10772  0.0  0.0  6912 2188 ?        Ss   11:31   0:00 sshd: kawamura [p
kamezawa 12341  0.6  0.0  5336 1476 tty2     Ss   11:17   0:06 -bash
kamezawa 15308  0.0  0.0  4788  544 tty1     S+   11:32   0:00 sleep 1
kamezawa 15315  0.0  0.0  2380  756 pts/0    R+   11:32   0:00 ps aux
kamezawa 17322  0.0  0.0  5332 1472 tty3     Ss+  11:18   0:00 -bash
root     22194  0.0  0.0  1760  744 ?        Ss   11:20   0:00 in.telnetd: awork
root     22198  0.0  0.0  2992 1476 ?        Ss   11:20   0:00 login -- kamezawa
kawamura 24526  0.0  0.0  6912 1544 ?        S    11:31   0:00 sshd: kawamura@pt
kawamura 24529  0.0  0.0  5336 1456 pts/3    Ss   11:31   0:00 -bash
satoshi  26239  2.2  0.3 40292 13696 ?       Sl   11:30   0:02 /usr/bin/gnome-te
==

But 'ps --sort start_time' is available.

-Kame

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