Re: [PATCH v8 1/9] dax: Use percpu rwsem for dax_{read,write}_lock()
From: Christoph Hellwig <hch@infradead.org>
Date: 2021-12-16 07:46:10
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On Wed, Dec 15, 2021 at 10:06:29AM +0800, Shiyang Ruan wrote:
在 2021/12/14 23:40, Christoph Hellwig 写道:quoted
On Thu, Dec 02, 2021 at 04:48:48PM +0800, Shiyang Ruan wrote:quoted
In order to introduce dax holder registration, we need a write lock for dax. Change the current lock to percpu_rw_semaphore and introduce a write lock for registration.Why do we need to change the existing, global locking for that?I think we have talked about this in the previous v7 patchset: https://lore.kernel.org/nvdimm/20210924130959.2695749-1-ruansy.fnst@fujitsu.com/T/#m4031bc3dc49dcbaac6f8d99877f910fa9a6f998a (local)
Any kind of rationale needs to go into the patch description.
I didn't test in benchmarks for now. Could you show me which one I should test this code on? I am not familiar with this...
Just normal read/write I/O on a DAX device.