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| author | Vlastimil Babka | 2016-03-15 22:56:12 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2016-03-16 00:55:16 +0100 |
| commit | 7dd80b8af0bcd705a9ef2fa272c082882616a499 (patch) | |
| tree | 75048a0e7ff2648c59b1a23640e202653fa1aa27 /mm/vmstat.c | |
| parent | mm, page_owner: print migratetype of page and pageblock, symbolic flags (diff) | |
| download | kernel-qcow2-linux-7dd80b8af0bcd705a9ef2fa272c082882616a499.tar.gz kernel-qcow2-linux-7dd80b8af0bcd705a9ef2fa272c082882616a499.tar.xz kernel-qcow2-linux-7dd80b8af0bcd705a9ef2fa272c082882616a499.zip | |
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.
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>
Diffstat (limited to 'mm/vmstat.c')
| -rw-r--r-- | mm/vmstat.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c index 72c17981cb70..69ce64f7b8d7 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1120,7 +1120,7 @@ static void pagetypeinfo_showmixedcount(struct seq_file *m, pg_data_t *pgdat) #ifdef CONFIG_PAGE_OWNER int mtype; - if (!page_owner_inited) + if (!static_branch_unlikely(&page_owner_inited)) return; drain_all_pages(NULL); |