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mm, debug_pagealloc: use a page type instead of page_ext flag

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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>
This commit is contained in:
Vlastimil Babka
2019-07-11 20:55:13 -07:00
committed by Linus Torvalds
parent 4462b32c92
commit 3972f6bb1c
7 changed files with 17 additions and 54 deletions
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3
mm/page_ext.c
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@@ -59,9 +59,6 @@
*/
static struct page_ext_operations *page_ext_ops[] = {
#ifdef CONFIG_DEBUG_PAGEALLOC
&debug_guardpage_ops,
#endif
#ifdef CONFIG_PAGE_OWNER
&page_owner_ops,
#endif