On Mon, 14 Oct 2019 15:22:00 +0200 Thomas Hellström (VMware) <thomas_os@xxxxxxxxxxxx> wrote: > Add two utilities to 1) write-protect and 2) 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. Not fully comfortable reviewing this one. > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -736,4 +736,7 @@ config ARCH_HAS_PTE_SPECIAL > config ARCH_HAS_HUGEPD > bool > > +config MAPPING_DIRTY_HELPERS > + bool > + But given this, it's your problem ;) So Acked-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Yes, please proceed with merging [1-4] via a drm tree.
