linux-kernel - Re: [RFC] IB/srp: Remove create

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Message-ID: <20160607192106.GY31708@htj.duckdns.org>
Date:	Tue, 7 Jun 2016 14:21:06 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Bart Van Assche <bart.vanassche@...disk.com>
Cc:	Bhaktipriya Shridhar <bhaktipriya96@...il.com>,
	Doug Ledford <dledford@...hat.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] IB/srp: Remove create_workqueue

On Tue, Jun 07, 2016 at 11:32:42AM -0700, Bart Van Assche wrote:
> On 06/07/2016 11:16 AM, Bhaktipriya Shridhar wrote:
> > alloc_workqueue replaces deprecated create_workqueue().
> > 
> > A dedicated workqueue has been used since the workqueue srp_remove_wq with
> > workitem &target->remove_work, is a work queue for the SRP target removal.
> > WQ_MEM_RECLAIM has been set to ensure forward progress under memory
> > pressure.
> > Since there are only a fixed number of work items, explicit
> > concurrency limit is unnecessary here.
> > 
> > Is the workqueue being used on a memory reclaim path?
> > Does it require WQ_MEM_RECLAIM?
> 
> Hello Bhaktipriya,
> 
> srp_remove_wq is used for SRP target port removal work only. This work is
> neither queued from inside a shrinker nor by the page writeback code so I
> think it is safe to drop WQ_MEM_RECLAIM.

It should be able to use system_wq then.

Thanks for the explanation!

-- 
tejun