linux-kernel - Re: [PATCH V2] scsi: storvsc: Allow only one remove lun work item to be issued per lun

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Message-ID: <20171021154444.GK1302522@devbig577.frc2.facebook.com>
Date:   Sat, 21 Oct 2017 08:44:44 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Cathy Avery <cavery@...hat.com>, kys@...rosoft.com,
        haiyangz@...rosoft.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, dan.carpenter@...cle.com,
        devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH V2] scsi: storvsc: Allow only one remove lun work item to
 be issued per lun

Hello,

On Thu, Oct 19, 2017 at 08:35:10AM -0700, Christoph Hellwig wrote:
> On Tue, Oct 17, 2017 at 01:35:21PM -0400, Cathy Avery wrote:
> > +	/*
> > +	 * Set the error handler work queue.
> > +	 */
> > +	snprintf(host_dev->work_q_name, sizeof(host_dev->work_q_name),
> > +		 "storvsc_error_wq_%d", host->host_no);
> > +	host_dev->handle_error_wq =
> > +			create_singlethread_workqueue(host_dev->work_q_name);
> 
> If you use alloc_ordered_workqueue directly instead of
> create_singlethread_workqueue you can pass a format string and don't
> need the separate allocation.
> 
> But I'm not sure if Tejun is fine with using __WQ_LEGACY directly..

The only thing that flag does is exempting the workqueue from possible
flush deadlock check as we don't know whether WQ_MEM_RECLAIM on a
legacy workqueue is intentional.  There's no reason to add it when
converting to alloc_ordered_workqueue().  Just decide whether it needs
forward progress guarantee and use WQ_MEM_RECLAIM if so.

Thanks.

-- 
tejun