From: Tejun Heo <tj@kernel.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Ming Lei <ming.lei@canonical.com>, Jens Axboe <axboe@kernel.dk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"Justin M. Forbes" <jforbes@fedoraproject.org>,
Jeff Moyer <jmoyer@redhat.com>, "v4.0" <stable@vger.kernel.org>
Subject: Re: [PATCH v6] block: loop: avoiding too many pending per work I/O
Date: Fri, 1 May 2015 11:47:13 -0400 [thread overview]
Message-ID: <20150501154713.GD1949@htj.duckdns.org> (raw)
In-Reply-To: <20150501150545.GA10705@infradead.org>
On Fri, May 01, 2015 at 08:05:45AM -0700, Christoph Hellwig wrote:
> > Maybe just cap max_active to NR_OF_LOOP_DEVS * 16 or sth? But idk,
> > how many concurrent workers are we talking about and why are we
> > capping per-queue concurrency from worker pool side instead of command
> > tag side?
>
> Also we probably should have per device workqueues to start with..
Yeah, that's an option. The only thing is that each workqueue would
have to be tagged WQ_RESCUER and end up with separate rescuer task,
which usually isn't big a deal but there are setups where a lot of
loop devices are used and it may sting a bit.
Thanks.
--
tejun
next prev parent reply other threads:[~2015-05-01 15:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-01 3:28 [PATCH v6] block: loop: avoiding too many pending per work I/O Ming Lei
2015-05-01 10:17 ` Christoph Hellwig
2015-05-01 13:36 ` Ming Lei
2015-05-01 14:22 ` Tejun Heo
2015-05-01 15:05 ` Christoph Hellwig
2015-05-01 15:47 ` Tejun Heo [this message]
2015-05-02 15:09 ` Ming Lei
2015-05-02 14:56 ` Ming Lei
2015-05-03 1:52 ` Tejun Heo
2015-05-04 12:54 ` Ming Lei
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