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Groups > linux.kernel > #1498116
| From | Dave Chinner <david@fromorbit.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC PATCH-tip v4 02/10] locking/rwsem: Stop active read lock ASAP |
| Date | 2016-10-10 08:10 +0200 |
| Message-ID | <sqBWF-65e-11@gated-at.bofh.it> (permalink) |
| References | <s7Gka-6XF-49@gated-at.bofh.it> <s7HSV-892-7@gated-at.bofh.it> <splqV-4mC-23@gated-at.bofh.it> <spoI9-6CY-7@gated-at.bofh.it> <sqo3o-5Tb-15@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Sun, Oct 09, 2016 at 08:17:48AM -0700, Christoph Hellwig wrote: > On Fri, Oct 07, 2016 at 08:47:51AM +1100, Dave Chinner wrote: > > Except that it's DAX, and in 4.7-rc1 that used shared locking at the > > XFS level and never took exclusive locks. > > > > *However*, the DAX IO path locking in XFS has changed in 4.9-rc1 to > > match the buffered IO single writer POSIX semantics - the test is a > > bad test based on the fact it exercised a path that is under heavy > > development and so can't be used as a regression test across > > multiple kernels. > > That being said - I wonder if we should allow the shared lock on DAX > files IFF the user is specifying O_DIRECT in the open mode.. It should do - if it doesn't then we screwed up the IO path selection logic in XFS and we'll need to fix it. Cheers, Dave. -- Dave Chinner david@fromorbit.com
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Re: [RFC PATCH-tip v4 02/10] locking/rwsem: Stop active read lock ASAP Davidlohr Bueso <dave@stgolabs.net> - 2016-10-06 20:20 +0200
Re: [RFC PATCH-tip v4 02/10] locking/rwsem: Stop active read lock ASAP Dave Chinner <david@fromorbit.com> - 2016-10-06 23:50 +0200
Re: [RFC PATCH-tip v4 02/10] locking/rwsem: Stop active read lock ASAP Davidlohr Bueso <dave@stgolabs.net> - 2016-10-07 01:00 +0200
Re: [RFC PATCH-tip v4 02/10] locking/rwsem: Stop active read lock ASAP Christoph Hellwig <hch@infradead.org> - 2016-10-09 17:20 +0200
Re: [RFC PATCH-tip v4 02/10] locking/rwsem: Stop active read lock ASAP Dave Chinner <david@fromorbit.com> - 2016-10-10 08:10 +0200
Re: [RFC PATCH-tip v4 02/10] locking/rwsem: Stop active read lock ASAP Christoph Hellwig <hch@infradead.org> - 2016-10-10 12:20 +0200
Re: [RFC PATCH-tip v4 02/10] locking/rwsem: Stop active read lock ASAP Dave Chinner <david@fromorbit.com> - 2016-10-11 23:10 +0200
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