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 7/8] blkcg: implement per-queue policy activation
Date: Fri, 13 Apr 2012 14:12:57 -0400 [thread overview]
Message-ID: <20120413181257.GG26383@redhat.com> (raw)
In-Reply-To: <1334273380-30233-8-git-send-email-tj@kernel.org>
On Thu, Apr 12, 2012 at 04:29:39PM -0700, Tejun Heo wrote:
[..]
> diff --git a/block/elevator.c b/block/elevator.c
> index be3ab6d..6a55d41 100644
> --- a/block/elevator.c
> +++ b/block/elevator.c
> @@ -896,8 +896,6 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
> ioc_clear_queue(q);
> spin_unlock_irq(q->queue_lock);
>
> - blkg_destroy_all(q, false);
> -
So now groups don't reclaimed until either cgroup is deleted or queue
exits. So if BLK_DEV_THROTTLE=n and cfq is switched out, blkg created
by CFQ policy will not be reclaimed (despite the fact nobody is using
them).
This is not necessarily bad, just thought of clarifying that it is the
design intent.
Thanks
Vivek
next prev parent reply other threads:[~2012-04-13 18:13 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
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 [this message]
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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