From: Bart Van Assche <bart.vanassche@sandisk.com>
To: Tejun Heo <tj@kernel.org>
Cc: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>,
Doug Ledford <dledford@redhat.com>,
Sean Hefty <sean.hefty@intel.com>,
Hal Rosenstock <hal.rosenstock@gmail.com>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] IB/srp: Remove create_workqueue
Date: Tue, 7 Jun 2016 12:56:25 -0700 [thread overview]
Message-ID: <bdf2c634-a765-eb97-5ca1-583d833b07c7@sandisk.com> (raw)
In-Reply-To: <20160607192106.GY31708@htj.duckdns.org>
On 06/07/2016 12:21 PM, Tejun Heo wrote:
> 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.
No. I have tried that but that resulted in a deadlock.
Bart.
next prev parent reply other threads:[~2016-06-07 19:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 18:16 [RFC] IB/srp: Remove create_workqueue Bhaktipriya Shridhar
2016-06-07 18:32 ` Bart Van Assche
2016-06-07 19:21 ` Tejun Heo
2016-06-07 19:56 ` Bart Van Assche [this message]
2016-06-07 20:00 ` Bart Van Assche
2016-06-20 18:59 ` Tejun Heo
2016-06-21 8:14 ` Bart Van Assche
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