[PATCH v2 1/2] mm: fix cache mode of dax pmd mappings

2016-09-08 Thread Andrew Morton
On Wed, 07 Sep 2016 15:26:14 -0700 Dan Williams wrote: > 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

[PATCH v2 1/2] mm: fix cache mode of dax pmd mappings

2016-09-07 Thread Dan Williams
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).