From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org,
Pavel Emelyanov <xemul@parallels.com>,
Glauber Costa <glommer@parallels.com>,
Andi Kleen <andi@firstfloor.org>, Tejun Heo <tj@kernel.org>,
Matt Helsley <matthltc@us.ibm.com>,
Pekka Enberg <penberg@kernel.org>,
Eric Dumazet <eric.dumazet@gmail.com>,
Vasiliy Kulikov <segoon@openwall.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [patch 1/4] Add routine for generating an ID for kernel pointer
Date: Wed, 28 Dec 2011 21:05:21 +0400 [thread overview]
Message-ID: <20111228170521.GT27266@moon> (raw)
In-Reply-To: <20111228165114.04fcae0f@pyramind.ukuu.org.uk>
On Wed, Dec 28, 2011 at 04:51:14PM +0000, Alan Cox wrote:
> > + be used for anything but the "sameness" test. Besides, the IDs are
> > + dynamic and valid only while object is alive, once it get freed or
>
> Please explain your locking model which ensures a false sameness cannot
> occur due to object reuse as you do the comparison and scan.
>
It can happen in case of object re-allocated from slab. But in case
of two living pids it's impossible to get same pointers for different
objects. Or I misunderstood the question, Alan? It's up to application
to not compare objects from dead tasks.
Cyrill
next prev parent reply other threads:[~2011-12-28 17:05 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-22 12:56 [patch 0/4] kernel generic object IDs series Cyrill Gorcunov
2011-12-22 12:56 ` [patch 1/4] Add routine for generating an ID for kernel pointer Cyrill Gorcunov
2011-12-28 16:51 ` Alan Cox
2011-12-28 17:05 ` Cyrill Gorcunov [this message]
2011-12-28 17:21 ` Alan Cox
2011-12-28 17:35 ` Cyrill Gorcunov
2011-12-28 19:48 ` Cyrill Gorcunov
2011-12-22 12:56 ` [patch 2/4] proc: Show namespaces IDs in /proc/pid/ns/* files Cyrill Gorcunov
2011-12-22 12:56 ` [patch 3/4] proc: Show open file ID in /proc/pid/fdinfo/* Cyrill Gorcunov
2011-12-22 13:24 ` [patch 0/4] kernel generic object IDs series Cyrill Gorcunov
2011-12-27 11:15 ` Cyrill Gorcunov
-- strict thread matches above, loose matches on Subject: below --
2011-12-23 12:47 [patch 0/4] generic object ids, v2 Cyrill Gorcunov
2011-12-23 12:47 ` [patch 1/4] Add routine for generating an ID for kernel pointer Cyrill Gorcunov
2011-12-27 23:23 ` Andrew Morton
2011-12-28 7:42 ` Cyrill Gorcunov
2011-12-28 9:42 ` Andrew Morton
2011-12-28 9:43 ` Cyrill Gorcunov
2011-12-28 9:47 ` Pavel Emelyanov
2011-12-28 10:41 ` Cyrill Gorcunov
2011-12-27 23:33 ` Andrew Morton
2011-12-28 0:48 ` Randy Dunlap
2011-12-28 7:24 ` Cyrill Gorcunov
2011-12-27 23:54 ` Valdis.Kletnieks
2011-12-28 0:02 ` Andrew Morton
2011-12-28 7:22 ` Cyrill Gorcunov
2011-12-28 16:06 ` Tejun Heo
2011-12-28 16:18 ` Cyrill Gorcunov
2011-12-28 16:26 ` Tejun Heo
2011-12-28 16:40 ` Cyrill Gorcunov
2011-12-28 16:45 ` Tejun Heo
2011-12-28 16:53 ` Cyrill Gorcunov
2011-12-28 17:01 ` Tejun Heo
2011-12-28 17:14 ` Cyrill Gorcunov
2011-12-29 14:24 ` Cyrill Gorcunov
2011-12-29 16:14 ` Tejun Heo
2011-12-29 16:24 ` Cyrill Gorcunov
2011-12-30 0:23 ` Herbert Xu
2011-12-30 7:36 ` Cyrill Gorcunov
2011-12-30 20:31 ` KOSAKI Motohiro
2011-12-30 20:48 ` Cyrill Gorcunov
2011-12-30 23:51 ` KOSAKI Motohiro
2011-12-31 7:51 ` Cyrill Gorcunov
2012-01-02 12:18 ` bastien ROUCARIES
2012-01-02 21:14 ` Cyrill Gorcunov
2011-12-31 4:55 ` Kyle Moffett
2011-12-31 7:57 ` Cyrill Gorcunov
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