From: Tejun Heo <tj@kernel.org>
To: Vivek Goyal <vgoyal@redhat.com>
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 11:17:05 -0700 [thread overview]
Message-ID: <20120413181705.GD12233@google.com> (raw)
In-Reply-To: <20120413181257.GG26383@redhat.com>
Hello,
On Fri, Apr 13, 2012 at 02:12:57PM -0400, Vivek Goyal wrote:
> 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).
It's not difficult to change. We can just trigger reclaim if no
policy is enabled for the queue. Hmmm... yeah, that's gonna be like
five line change. I'll add it.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-04-13 18:17 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
2012-04-13 18:17 ` Tejun Heo [this message]
2012-04-12 23:29 ` [PATCH 8/8] blkcg: drop stuff unused after per-queue policy activation update Tejun Heo
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