linux-kernel - Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated create_singlethread

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Message-ID: <20161108225221.GB6460@htj.duckdns.org>
Date:   Tue, 8 Nov 2016 17:52:21 -0500
From:   Tejun Heo <tj@...nel.org>
To:     "J. Bruce Fields" <bfields@...ldses.org>
Cc:     Bhaktipriya Shridhar <bhaktipriya96@...il.com>,
        Jeff Layton <jlayton@...chiereds.net>,
        linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated
 create_singlethread_workqueue

Hello, Bruce.

On Tue, Nov 08, 2016 at 04:39:11PM -0500, J. Bruce Fields wrote:
> Apologies, just cleaning out old mail and finding some I should have
> responded to long ago:
> 
> On Wed, Aug 31, 2016 at 02:23:48AM +0530, Bhaktipriya Shridhar wrote:
> > The workqueue "callback_wq" queues a single work item &cb->cb_work per
> > nfsd4_callback instance and thus, it doesn't require execution ordering.
> 
> What's "execution ordering"?
> 
> We definitely do depend on the fact that at most one of these is running
> at a time.

If there can be multiple cb's and thus cb->cb_work's per callback_wq,
it'd need explicit ordering.  Is that the case?

Thanks.

-- 
tejun