Re: [PATCH] bugfix dax fault page should be no cache

From	Matthew Wilcox <willy@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] bugfix dax fault page should be no cache
Date	2016-01-13 17:40 +0100
Message-ID	<qQwCL-2o0-31@gated-at.bofh.it> (permalink)
References	<qPY81-3Kg-5@gated-at.bofh.it> <qQ6Ih-11c-5@gated-at.bofh.it> <qQkBA-2i0-15@gated-at.bofh.it>
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On Wed, Jan 13, 2016 at 11:47:12AM +0800, Chenjie (K) wrote:
> The DAX means Direct Access for files，if the pages have cache,
> the file is not direct access. But in normal condition,
> we can not find the problem directly.

The file absolutely is direct accessed.  The CPU cache is critical to
performance, and should not be bypassed lightly.  We have instructions to
flush the cache, and a library (see http://pmem.io/) so that applications
don't have to use them directly.

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[PATCH] bugfix dax fault page should be no cache <chenjie6@huawei.com> - 2016-01-12 04:50 +0100
  Re: [PATCH] bugfix dax fault page should be no cache Matthew Wilcox <willy@linux.intel.com> - 2016-01-12 14:00 +0100
    Re: [PATCH] bugfix dax fault page should be no cache "Chenjie (K)" <chenjie6@huawei.com> - 2016-01-13 04:50 +0100
      Re: [PATCH] bugfix dax fault page should be no cache Matthew Wilcox <willy@linux.intel.com> - 2016-01-13 17:40 +0100

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