From: Oleg Nesterov <oleg@redhat.com>
To: Greg Kurz <gkurz@fr.ibm.com>
Cc: Louis Rilling <Louis.Rilling@kerlabs.com>,
linux-kernel@vger.kernel.org, ebiederm@xmission.com,
containers@lists.osdl.org, akpm@linux-foundation.org,
xemul@openvz.org
Subject: Re: [PATCH] Introduce ActivePid: in /proc/self/status (v2, was Vpid:)
Date: Thu, 16 Jun 2011 15:18:21 +0200 [thread overview]
Message-ID: <20110616131821.GA21230@redhat.com> (raw)
In-Reply-To: <1308229251.8230.77.camel@bahia.local>
On 06/16, Greg Kurz wrote:
>
> Ok. You're right, the RCU grace period is just what I need to ensure I
> won't dereference a stale pointer. So I don't even have to bother with
> ->siglock and just check pid_alive() before peeking into pid->numbers.
Yes, but you don't really need pid_alive(). Just read ->pids[].pid and
check it is !NULL before dereferencing. Also, we already have 2 pid_alive()
checks, this is ugly. You can consolidate this code.
Oleg.
next prev parent reply other threads:[~2011-06-16 13:21 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-15 14:55 [PATCH] Introduce ActivePid: in /proc/self/status (v2, was Vpid:) Greg Kurz
2011-06-15 18:46 ` Oleg Nesterov
2011-06-15 19:08 ` Eric W. Biederman
2011-06-16 11:01 ` Greg Kurz
2011-06-16 12:35 ` Louis Rilling
2011-06-16 13:00 ` Greg Kurz
2011-06-16 13:18 ` Oleg Nesterov [this message]
2011-06-16 13:25 ` Louis Rilling
2011-06-16 14:51 ` Oleg Nesterov
2011-06-16 15:08 ` Louis Rilling
2011-06-16 15:01 ` Greg Kurz
2011-06-16 15:27 ` Louis Rilling
2011-06-16 12:42 ` Oleg Nesterov
2011-06-15 19:03 ` Oleg Nesterov
2011-06-16 11:19 ` Greg Kurz
2011-06-16 12:25 ` Cedric Le Goater
2011-06-16 13:06 ` Oleg Nesterov
2011-06-16 14:25 ` Cedric Le Goater
2011-06-16 15:22 ` Eric W. Biederman
2011-06-16 16:22 ` Oleg Nesterov
2011-06-16 15:07 ` Eric W. Biederman
2011-06-16 15:33 ` Greg Kurz
2011-06-16 16:12 ` Oleg Nesterov
2011-06-16 12:52 ` Oleg Nesterov
2011-06-16 17:54 ` Bryan Donlan
2011-06-20 11:45 ` Greg Kurz
2011-06-20 17:37 ` Bryan Donlan
2011-06-20 22:44 ` Eric W. Biederman
2011-06-22 15:29 ` Greg Kurz
2011-06-23 0:39 ` Eric W. Biederman
2011-06-23 13:43 ` Greg Kurz
2011-06-23 14:37 ` Serge Hallyn
2011-06-22 15:00 ` Greg Kurz
2011-06-22 16:56 ` Bryan Donlan
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