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authorVlastimil Babka <vbabka@suse.cz>2019-07-12 06:55:13 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-12 21:05:43 +0300
commit3972f6bb1c6ae1d32dcf2e4ff635d24b77f26dcb (patch)
tree24a0c4a24d8e1afdcb7ca5dd088c1bd4d191a9b9 /mm/page_ext.c
parent4462b32c9285b521ef378907aa66a5ca485aae41 (diff)
downloadlinux-3972f6bb1c6ae1d32dcf2e4ff635d24b77f26dcb.tar.xz
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/page_ext.c')
-rw-r--r--mm/page_ext.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/mm/page_ext.c b/mm/page_ext.c
index d8f1aca4ad43..5f5769c7db3b 100644
--- a/mm/page_ext.c
+++ b/mm/page_ext.c
@@ -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