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author | Dan Williams <dan.j.williams@intel.com> | 2016-09-07 08:51:21 -0700 |
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committer | Dan Williams <dan.j.williams@intel.com> | 2016-09-09 17:34:46 -0700 |
commit | 9049771f7d5490a302589976984810064c83ab40 (patch) | |
tree | 139176732c8a7a1ccf66ed7399cce292730732c5 /drivers/acpi/nfit | |
parent | ca120cf688874f4423e579e7cc5ddf7244aeca45 (diff) | |
download | linux-9049771f7d5490a302589976984810064c83ab40.tar.bz2 |
mm: fix cache mode of dax pmd mappings
track_pfn_insert() in vmf_insert_pfn_pmd() is marking dax mappings as
uncacheable rendering them impractical for application usage. DAX-pte
mappings are cached and the goal of establishing DAX-pmd mappings is to
attain more performance, not dramatically less (3 orders of magnitude).
track_pfn_insert() relies on a previous call to reserve_memtype() to
establish the expected page_cache_mode for the range. While memremap()
arranges for reserve_memtype() to be called, devm_memremap_pages() does
not. So, teach track_pfn_insert() and untrack_pfn() how to handle
tracking without a vma, and arrange for devm_memremap_pages() to
establish the write-back-cache reservation in the memtype tree.
Cc: <stable@vger.kernel.org>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Nilesh Choudhury <nilesh.choudhury@oracle.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Toshi Kani <toshi.kani@hpe.com>
Reported-by: Kai Zhang <kai.ka.zhang@oracle.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/acpi/nfit')
0 files changed, 0 insertions, 0 deletions