linux-kernel - RE: [PATCH] workqueue: doc change for ST behavior on NUMA systems

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Date:   Tue, 18 Jul 2017 14:32:34 -0700
From:   Alexei Potashnik <alexei@...estorage.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     tj@...nel.org, linux-kernel@...r.kernel.org
Subject: RE: [PATCH] workqueue: doc change for ST behavior on NUMA systems

target has a bug in TMR handling.

        dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM |
WQ_UNBOUND, 1,
                                      dev->transport->name);

LUN_RESET can race with TASK_ABORT in different sessions.
Will send a patch to target list.

-----Original Message-----
From: Christoph Hellwig [mailto:hch@...radead.org]
Sent: Tuesday, July 18, 2017 12:18 PM
To: Alexei Potashnik <alexei@...estorage.com>
Cc: tj@...nel.org; linux-kernel@...r.kernel.org
Subject: Re: [PATCH] workqueue: doc change for ST behavior on NUMA systems

On Tue, Jul 18, 2017 at 11:12:53AM -0700, Alexei Potashnik wrote:
> NUMA rework of workqueue made the combination of max_active of 1 and
> WQ_UNBOUND insufficient to guarantee ST behavior system wide.
>
> alloc_ordered_queue should now be used instead.

Eww.  And how many existing users might be broken by that?