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Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to libnvdimm

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On Sun, Jan 22, 2017 at 06:19:24PM +0000, Matthew Wilcox wrote:
> No, I mean a network filesystem like 9p or cifs or nfs.  If the memcpy
> is supposed to be performed by the backing device

struct backing_dev has no relation to the DAX code.  Even more so what's
the point of doing a DAXish memcpy in that case?  If we buffer in
memory for network I/O we should just use the page cache.

> (Also, the network filesystem might have a command, like RDMA has/will have, to ensure that the write has reached persistence)

I know very well due to my work for a DAX-backed pNFS layout.  But that
is mostly transparent to the NFS frontend code and won't use DAX
on the client at all.  Just pagecache as a source for RDMA READ/WRITE.

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[PATCH 00/13] dax, pmem: move cpu cache maintenance to libnvdimm Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
  [PATCH 08/13] x86, libnvdimm, dax: stop abusing __copy_user_nocache Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
  [PATCH 10/13] libnvdimm, pmem: fix persistence warning Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
  [PATCH 07/13] x86, libnvdimm,  pmem: move arch_invalidate_pmem() to libnvdimm Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
  [PATCH 01/13] x86, dax,  pmem: remove indirection around memcpy_from_pmem() Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
  [PATCH 05/13] x86,  dax: replace clear_pmem() with open coded memset + dax_ops->flush Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
    Re: [PATCH 05/13] x86, dax: replace clear_pmem() with open coded  memset + dax_ops->flush Jan Kara <jack@suse.cz> - 2017-01-20 11:50 +0100
      Re: [PATCH 05/13] x86, dax: replace clear_pmem() with open coded  memset + dax_ops->flush Dan Williams <dan.j.williams@intel.com> - 2017-01-20 16:40 +0100
  [PATCH 03/13] x86, dax,  pmem: introduce 'copy_from_iter' dax operation Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
  [PATCH 13/13] libnvdimm,  pmem: disable dax flushing for 'cache flush on fail' platforms Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
  [PATCH 09/13] libnvdimm,  pmem: implement cache bypass for all copy_from_iter() operations Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
  [PATCH 04/13] dax, pmem: introduce an optional 'flush' dax operation Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
  [PATCH 06/13] x86, dax, libnvdimm: move wb_cache_pmem() to libnvdimm Dan Williams <dan.j.williams@intel.com> - 2017-01-20 05:00 +0100
  RE: [PATCH 00/13] dax, pmem: move cpu cache maintenance to libnvdimm Matthew Wilcox <mawilcox@microsoft.com> - 2017-01-21 17:30 +0100
    Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to         libnvdimm Christoph Hellwig <hch@lst.de> - 2017-01-21 19:00 +0100
      RE: [PATCH 00/13] dax, pmem: move cpu cache maintenance to     libnvdimm Matthew Wilcox <mawilcox@microsoft.com> - 2017-01-22 16:50 +0100
        Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to         libnvdimm Christoph Hellwig <hch@lst.de> - 2017-01-22 17:40 +0100
          RE: [PATCH 00/13] dax, pmem: move cpu cache maintenance to     libnvdimm Matthew Wilcox <mawilcox@microsoft.com> - 2017-01-22 19:20 +0100
            Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to         libnvdimm Christoph Hellwig <hch@lst.de> - 2017-01-22 19:40 +0100
              RE: [PATCH 00/13] dax, pmem: move cpu cache maintenance to     libnvdimm Matthew Wilcox <mawilcox@microsoft.com> - 2017-01-22 19:40 +0100
                Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to         libnvdimm Christoph Hellwig <hch@lst.de> - 2017-01-22 19:50 +0100
                RE: [PATCH 00/13] dax, pmem: move cpu cache maintenance to     libnvdimm Matthew Wilcox <mawilcox@microsoft.com> - 2017-01-23 07:40 +0100
                Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to libnvdimm Dan Williams <dan.j.williams@intel.com> - 2017-01-23 08:20 +0100
                Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to         libnvdimm Christoph Hellwig <hch@lst.de> - 2017-01-23 17:10 +0100
                Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to libnvdimm Dan Williams <dan.j.williams@intel.com> - 2017-01-23 18:20 +0100
                Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to         libnvdimm Christoph Hellwig <hch@lst.de> - 2017-01-23 19:10 +0100
                Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to libnvdimm Dan Williams <dan.j.williams@intel.com> - 2017-01-23 19:40 +0100
                Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to         libnvdimm Christoph Hellwig <hch@lst.de> - 2017-01-23 17:00 +0100
      Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to libnvdimm Dan Williams <dan.j.williams@intel.com> - 2017-01-22 18:40 +0100
        Re: [PATCH 00/13] dax, pmem: move cpu cache maintenance to         libnvdimm Christoph Hellwig <hch@lst.de> - 2017-01-23 17:10 +0100

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