Ack to merge through DRM? WAS Re: [PATCH v2 1/5] mm: Add write-protect and clean utilities for address space ranges

Thomas Hellström (VMware) thomas_os at
Thu Sep 26 12:03:19 UTC 2019

On 9/26/19 1:55 PM, Thomas Hellström (VMware) wrote:
> From: Thomas Hellstrom <thellstrom at>
> Add two utilities to a) write-protect and b) clean all ptes pointing into
> a range of an address space.
> The utilities are intended to aid in tracking dirty pages (either
> driver-allocated system memory or pci device memory).
> The write-protect utility should be used in conjunction with
> page_mkwrite() and pfn_mkwrite() to trigger write page-faults on page
> accesses. Typically one would want to use this on sparse accesses into
> large memory regions. The clean utility should be used to utilize
> hardware dirtying functionality and avoid the overhead of page-faults,
> typically on large accesses into small memory regions.
> Cc: Andrew Morton <akpm at>
> Cc: Matthew Wilcox <willy at>
> Cc: Will Deacon <will.deacon at>
> Cc: Peter Zijlstra <peterz at>
> Cc: Rik van Riel <riel at>
> Cc: Minchan Kim <minchan at>
> Cc: Michal Hocko <mhocko at>
> Cc: Huang Ying <ying.huang at>
> Cc: Souptick Joarder <jrdr.linux at>
> Cc: "Jérôme Glisse" <jglisse at>
> Cc: linux-mm at
> Cc: linux-kernel at
> Signed-off-by: Thomas Hellstrom <thellstrom at>
> Reviewed-by: Ralph Campbell <rcampbell at>
> ---


I wonder if I can get an ack from an mm maintainer to merge this through 
DRM along with the vmwgfx patches? Andrew? Matthew?


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