• Thomas Hellstrom's avatar
    mm: Add write-protect and clean utilities for address space ranges · c5acad84
    Thomas Hellstrom authored
    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.
    
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Matthew Wilcox <willy@infradead.org>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Rik van Riel <riel@surriel.com>
    Cc: Minchan Kim <minchan@kernel.org>
    Cc: Michal Hocko <mhocko@suse.com>
    Cc: Huang Ying <ying.huang@intel.com>
    Cc: Jérôme Glisse <jglisse@redhat.com>
    Cc: Kirill A. Shutemov <kirill@shutemov.name>
    Signed-off-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
    Acked-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    c5acad84
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