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| author |   Vlastimil Babka <vbabka@suse.cz> | 2019-07-11 20:55:13 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-12 11:05:43 -0700 |
| commit | 3972f6bb1c6ae1d32dcf2e4ff635d24b77f26dcb (patch) | |
| tree | 24a0c4a24d8e1afdcb7ca5dd088c1bd4d191a9b9 /mm/Kconfig.debug | |
| parent | mm, page_alloc: more extensive free page checking with debug_pagealloc (diff) | |
| download | linux-dev-3972f6bb1c6ae1d32dcf2e4ff635d24b77f26dcb.tar.xz linux-dev-3972f6bb1c6ae1d32dcf2e4ff635d24b77f26dcb.zip | |
mm, debug_pagealloc: use a page type instead of page_ext flag
When debug_pagealloc is enabled, we currently allocate the page_ext
array to mark guard pages with the PAGE_EXT_DEBUG_GUARD flag. Now that
we have the page_type field in struct page, we can use that instead, as
guard pages are neither PageSlab nor mapped to userspace. This reduces
memory overhead when debug_pagealloc is enabled and there are no other
features requiring the page_ext array.
Link: http://lkml.kernel.org/r/20190603143451.27353-4-vbabka@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig.debug')
| -rw-r--r-- | mm/Kconfig.debug | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug index a35ab6c55192..82b6a20898bd 100644 --- a/mm/Kconfig.debug +++ b/mm/Kconfig.debug @@ -12,7 +12,6 @@ config DEBUG_PAGEALLOC bool "Debug page memory allocations" depends on DEBUG_KERNEL depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC - select PAGE_EXTENSION select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC ---help--- Unmap pages from the kernel linear mapping after free_pages(). |