From: Vivek Goyal <vgoyal@redhat.com>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: Tejun Heo <tj@kernel.org>,
axboe@kernel.dk, linux-kernel@vger.kernel.org,
ctalbott@google.com, rni@google.com,
containers@lists.linux-foundation.org
Subject: Re: [PATCH 02/10] block: fix genhd refcounting in blkio_policy_parse_and_set()
Date: Thu, 20 Oct 2011 13:50:22 -0400 [thread overview]
Message-ID: <20111020175022.GD13685@redhat.com> (raw)
In-Reply-To: <CAPXgP12hvveG8y31Q77BQAzrdaeaux=Eoonu8RinGmP3DfTsbQ@mail.gmail.com>
On Thu, Oct 20, 2011 at 06:16:04PM +0200, Kay Sievers wrote:
> On Thu, Oct 20, 2011 at 18:11, Tejun Heo <tj@kernel.org> wrote:
> > I think this is essentially a bug. If you have something like "dev =
> > find_and_get(); put(dev); return dev != NULL;", it's a pretty good
> > indication something is pretty screwed there, so unless someone
> > screams really loud, I think I'm gonna push for removal of the
> > feature.
>
> Matching on unpredictable dev_t inside the kernel or in userspace is a
> serious bug. We can't do anything like that ever on a modern system,
> these times are long over.
>
> Yes, please get rid of this misguided logic, nobody should get the
> impression that this can ever work.
Kay,
So are you suggesting don't use device major/minor number for specifying
the rules in cgroup or you are suggesting the same thing as Tejun that
automatically get rid of rule when device goes away.
If it is former, then what else one can use for specifying the rule.
Thanks
Vivek
next prev parent reply other threads:[~2011-10-20 17:52 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-19 4:26 [PATCHSET block/for-next] fix request_queue life-cycle management Tejun Heo
2011-10-19 4:26 ` [PATCH 01/10] block: make gendisk hold a reference to its queue Tejun Heo
2011-10-19 4:26 ` [PATCH 02/10] block: fix genhd refcounting in blkio_policy_parse_and_set() Tejun Heo
2011-10-19 13:26 ` Vivek Goyal
2011-10-19 16:29 ` Tejun Heo
2011-10-19 16:59 ` Vivek Goyal
2011-10-19 22:05 ` Tejun Heo
2011-10-19 22:07 ` Tejun Heo
2011-10-19 23:51 ` Tejun Heo
2011-10-20 13:41 ` Vivek Goyal
2011-10-20 16:11 ` Tejun Heo
2011-10-20 16:16 ` Kay Sievers
2011-10-20 17:50 ` Vivek Goyal [this message]
2011-10-20 17:47 ` Vivek Goyal
2011-10-19 4:26 ` [PATCH 03/10] block: move blk_throtl prototypes to block/blk.h Tejun Heo
2011-10-19 13:33 ` Vivek Goyal
2011-10-19 4:26 ` [PATCH 04/10] block: pass around REQ_* flags instead of broken down booleans during request alloc/free Tejun Heo
2011-10-19 13:44 ` Vivek Goyal
2011-10-19 16:31 ` Tejun Heo
2011-10-19 4:26 ` [PATCH 05/10] block: drop unnecessary blk_get/put_queue() in scsi_cmd_ioctl() and blk_get_tg() Tejun Heo
2011-10-19 13:52 ` Vivek Goyal
2011-10-19 16:35 ` Tejun Heo
2011-10-19 4:26 ` [PATCH 06/10] block: reorganize queue draining Tejun Heo
2011-10-19 4:26 ` [PATCH 07/10] block: reorganize throtl_get_tg() and blk_throtl_bio() Tejun Heo
2011-10-19 14:56 ` Vivek Goyal
2011-10-19 17:06 ` Tejun Heo
2011-10-19 17:19 ` Vivek Goyal
2011-10-19 17:30 ` Tejun Heo
2011-10-19 17:45 ` Vivek Goyal
2011-10-19 17:49 ` Tejun Heo
2011-10-19 4:26 ` [PATCH 08/10] block: make get_request[_wait]() fail if queue is dead Tejun Heo
2011-10-19 15:22 ` Vivek Goyal
2011-10-19 4:26 ` [PATCH 09/10] block: drop @tsk from attempt_plug_merge() and explain sync rules Tejun Heo
2011-10-19 4:26 ` [PATCH 10/10] block: fix request_queue lifetime handling by making blk_queue_cleanup() proper shutdown Tejun Heo
2011-10-19 12:43 ` Jens Axboe
2011-10-19 17:13 ` Tejun Heo
2011-10-19 18:04 ` Jens Axboe
2011-10-19 16:18 ` Vivek Goyal
2011-10-19 17:12 ` Tejun Heo
2011-10-19 17:29 ` Vivek Goyal
2011-10-19 17:33 ` Tejun Heo
2011-10-19 4:29 ` [PATCHSET block/for-next] fix request_queue life-cycle management Tejun Heo
2011-10-19 12:44 ` Jens Axboe
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