From: Vivek Goyal <vgoyal@redhat.com>
To: Tejun Heo <tj@kernel.org>
Cc: axboe@kernel.dk, ctalbott@google.com, rni@google.com,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
containers@lists.linux-foundation.org
Subject: Re: [PATCH 1/8] blkcg: kill blkio_list and replace blkio_list_lock with a mutex
Date: Fri, 13 Apr 2012 09:32:26 -0400 [thread overview]
Message-ID: <20120413133226.GB26383@redhat.com> (raw)
In-Reply-To: <1334273380-30233-2-git-send-email-tj@kernel.org>
On Thu, Apr 12, 2012 at 04:29:33PM -0700, Tejun Heo wrote:
Hi Tejun,
> @@ -732,20 +732,21 @@ void blkio_policy_register(struct blkio_policy_type *blkiop)
> {
> struct request_queue *q;
>
> + mutex_lock(&blkcg_pol_mutex);
> +
> blkcg_bypass_start();
> - spin_lock(&blkio_list_lock);
>
> BUG_ON(blkio_policy[blkiop->plid]);
A minor nit. It might be a good idea to check that blkiop->plid is not
greater than BLKIO_NR_POLICIES for both registration and unresitration
functions to avoid touching memory beyond blkio_policy[] array.
Thanks
Vivek
next prev parent reply other threads:[~2012-04-13 13:32 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-12 23:29 [PATCHSET] block: per-queue policy activation Tejun Heo
2012-04-12 23:29 ` [PATCH 1/8] blkcg: kill blkio_list and replace blkio_list_lock with a mutex Tejun Heo
2012-04-13 13:32 ` Vivek Goyal [this message]
2012-04-13 16:55 ` Tejun Heo
2012-04-12 23:29 ` [PATCH 2/8] blkcg: use @pol instead of @plid in update_root_blkg_pd() and blkcg_print_blkgs() Tejun Heo
2012-04-12 23:29 ` [PATCH 3/8] blkcg: remove static policy ID enums Tejun Heo
2012-04-12 23:29 ` [PATCH 4/8] blkcg: make blkg_conf_prep() take @pol and return with queue lock held Tejun Heo
2012-04-12 23:29 ` [PATCH 5/8] blkcg: make sure blkg_lookup() returns %NULL if @q is bypassing Tejun Heo
2012-04-13 16:00 ` Vivek Goyal
2012-04-13 17:03 ` Tejun Heo
2012-04-13 17:23 ` Vivek Goyal
2012-04-13 17:28 ` Tejun Heo
2012-04-16 22:41 ` Paul E. McKenney
2012-04-12 23:29 ` [PATCH 6/8] blkcg: add request_queue->root_blkg Tejun Heo
2012-04-12 23:29 ` [PATCH 7/8] blkcg: implement per-queue policy activation Tejun Heo
2012-04-13 15:21 ` Vivek Goyal
2012-04-13 15:23 ` Vivek Goyal
2012-04-13 18:12 ` Vivek Goyal
2012-04-13 18:17 ` Tejun Heo
2012-04-12 23:29 ` [PATCH 8/8] blkcg: drop stuff unused after per-queue policy activation update Tejun Heo
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