diff options
| author | Vlastimil Babka <vbabka@suse.cz> | 2016-03-15 14:56:12 -0700 |
|---|---|---|
| committer | Prakash Gupta <guptap@codeaurora.org> | 2017-07-07 15:12:09 +0530 |
| commit | 2e58c8c7ee361f01d48d949da1f09a55c3d4e42d (patch) | |
| tree | 7afeda25eb9bd7793648e26558c50f772191c280 /include | |
| parent | 188f10f240d08a24a6ad1d96bd5b3038ce1dd05b (diff) | |
mm, page_owner: convert page_owner_inited to static key
CONFIG_PAGE_OWNER attempts to impose negligible runtime overhead when
enabled during compilation, but not actually enabled during runtime by
boot param page_owner=on. This overhead can be further reduced using
the static key mechanism, which this patch does.
Change-Id: I76e44d92ed973647d4fd6489f97db5ffeb893354
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-commit: 7dd80b8af0bcd705a9ef2fa272c082882616a499
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[guptap@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/page_owner.h | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/include/linux/page_owner.h b/include/linux/page_owner.h index cacaabea8a09..8e2eb153c7b9 100644 --- a/include/linux/page_owner.h +++ b/include/linux/page_owner.h @@ -1,8 +1,10 @@ #ifndef __LINUX_PAGE_OWNER_H #define __LINUX_PAGE_OWNER_H +#include <linux/jump_label.h> + #ifdef CONFIG_PAGE_OWNER -extern bool page_owner_inited; +extern struct static_key_false page_owner_inited; extern struct page_ext_operations page_owner_ops; extern void __reset_page_owner(struct page *page, unsigned int order); @@ -12,27 +14,23 @@ extern gfp_t __get_page_owner_gfp(struct page *page); static inline void reset_page_owner(struct page *page, unsigned int order) { - if (likely(!page_owner_inited)) - return; - - __reset_page_owner(page, order); + if (static_branch_unlikely(&page_owner_inited)) + __reset_page_owner(page, order); } static inline void set_page_owner(struct page *page, unsigned int order, gfp_t gfp_mask) { - if (likely(!page_owner_inited)) - return; - - __set_page_owner(page, order, gfp_mask); + if (static_branch_unlikely(&page_owner_inited)) + __set_page_owner(page, order, gfp_mask); } static inline gfp_t get_page_owner_gfp(struct page *page) { - if (likely(!page_owner_inited)) + if (static_branch_unlikely(&page_owner_inited)) + return __get_page_owner_gfp(page); + else return 0; - - return __get_page_owner_gfp(page); } #else static inline void reset_page_owner(struct page *page, unsigned int order) |