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authorThomas Hellstrom <thellstrom@vmware.com>2019-03-19 13:12:30 +0100
committerThomas Hellstrom <thellstrom@vmware.com>2019-11-06 13:03:36 +0100
commitc5acad84cf1e33ca1a50984952e1c5b2caa0e13f (patch)
treef6c73731de9ed646f4b0a4dd8a931439bb0a33f7 /mm/Kconfig
parentecaad8aca20432fa60821282d8ff479629c9f7b9 (diff)
downloadlinux-c5acad84cf1e33ca1a50984952e1c5b2caa0e13f.tar.bz2
mm: Add write-protect and clean utilities for address space ranges
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: Thomas Hellstrom <thellstrom@vmware.com> Acked-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig')
-rw-r--r--mm/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index a5dae9a7eb51..550f7aceb679 100644
--- 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
+
endmenu