linux-kernel - Re: [PATCH] bdi: Move cgroup bdi_writeback to a dedicated low concurrency workqueue

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Message-Id: <20180523191044.GC3803@linux.vnet.ibm.com>
Date:   Wed, 23 May 2018 12:10:44 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
        Jan Kara <jack@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>, kernel-team@...com
Subject: Re: [PATCH] bdi: Move cgroup bdi_writeback to a dedicated low
 concurrency workqueue

On Wed, May 23, 2018 at 11:51:43AM -0700, Tejun Heo wrote:
> On Wed, May 23, 2018 at 11:39:07AM -0700, Paul E. McKenney wrote:
> > > While this resolves the problem at hand, it might be a good idea to
> > > isolate rcu_exp_work to its own workqueue too as it can be used from
> > > various paths and is prone to this sort of indirect A-A deadlocks.
> > 
> > Commit ad7c946b35ad4 ("rcu: Create RCU-specific workqueues with rescuers")
> > was accepted into mainline this past merge window.  Does that do what
> > you want, or are you looking for something else?
> 
> Ah, that does it.  Sorry, was looking at an older kernel.

No worries -- after all, I must confess that I was a bit slow in getting
to this.

							Thanx, Paul