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Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated create_singlethread_workqueue

From "J. Bruce Fields" <bfields@fieldses.org>
Newsgroups linux.kernel
Subject Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated create_singlethread_workqueue
Date 2016-11-09 02:30 +0100
Message-ID <sBpS9-u5-1@gated-at.bofh.it> (permalink)
References <sbYit-1r7-1@gated-at.bofh.it> <sBmhA-6wF-15@gated-at.bofh.it> <sBnwZ-7iq-23@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue, Nov 08, 2016 at 05:52:21PM -0500, Tejun Heo wrote:
> 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?

Yes, there can be multiple cb_work's.

--b.

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Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue "J. Bruce Fields" <bfields@fieldses.org> - 2016-11-08 22:40 +0100
  Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue Tejun Heo <tj@kernel.org> - 2016-11-09 00:00 +0100
    Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue "J. Bruce Fields" <bfields@fieldses.org> - 2016-11-09 02:30 +0100
      Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue Jeff Layton <jlayton@poochiereds.net> - 2016-11-09 14:20 +0100
        Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue Trond Myklebust <trondmy@primarydata.com> - 2016-11-09 16:10 +0100
          Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue Jeff Layton <jlayton@poochiereds.net> - 2016-11-09 16:20 +0100
        Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue "J. Bruce Fields" <bfields@fieldses.org> - 2016-11-09 17:30 +0100
          Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue Jeff Layton <jlayton@poochiereds.net> - 2016-11-09 18:40 +0100
            Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue "J. Bruce Fields" <bfields@fieldses.org> - 2016-11-09 20:50 +0100
              Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue "J. Bruce Fields" <bfields@fieldses.org> - 2016-11-09 21:30 +0100
                Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated  create_singlethread_workqueue Jeff Layton <jlayton@poochiereds.net> - 2016-11-09 23:40 +0100

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