Re: [PATCH v9 01/10] dax: Use percpu rwsem for dax_{read,write}_lock()

2022-01-06 Thread Shiyang Ruan
在 2022/1/5 6:44, Dan Williams 写道: On Sun, Dec 26, 2021 at 6:35 AM Shiyang Ruan wrote: In order to introduce dax holder registration, we need a write lock for dax. As far as I can see, no, a write lock is not needed while the holder is being registered. The synchronization that is needed

Re: [PATCH v9 01/10] dax: Use percpu rwsem for dax_{read,write}_lock()

2022-01-05 Thread Darrick J. Wong
On Tue, Jan 04, 2022 at 02:44:08PM -0800, Dan Williams wrote: > On Sun, Dec 26, 2021 at 6:35 AM Shiyang Ruan wrote: > > > > In order to introduce dax holder registration, we need a write lock for > > dax. > > As far as I can see, no, a write lock is not needed while the holder > is being register

Re: [PATCH v9 01/10] dax: Use percpu rwsem for dax_{read,write}_lock()

2022-01-04 Thread Dan Williams
On Sun, Dec 26, 2021 at 6:35 AM Shiyang Ruan wrote: > > In order to introduce dax holder registration, we need a write lock for > dax. As far as I can see, no, a write lock is not needed while the holder is being registered. The synchronization that is needed is to make sure that the device stay