diff options
| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2016-03-18 00:17:41 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-18 01:09:34 +0300 |
| commit | 832fc1de01aea28255cb11d270679b7f1273f0d7 (patch) | |
| tree | ef020cb2a44d1fee4df1359fbb3fc11a08de733b /include/linux | |
| parent | 12580e4b54ba8a1b22ec977c200be0174ca42348 (diff) | |
| download | linux-832fc1de01aea28255cb11d270679b7f1273f0d7.tar.xz | |
/proc/kpageflags: return KPF_BUDDY for "tail" buddy pages
Currently /proc/kpageflags returns nothing for "tail" buddy pages, which
is inconvenient when grasping how free pages are distributed. This
patch sets KPF_BUDDY for such pages.
With this patch:
$ grep MemFree /proc/meminfo ; tools/vm/page-types -b buddy
MemFree: 3134992 kB
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000000400 779272 3044 __________B_______________________________ buddy
0x0000000000000c00 4385 17 __________BM______________________________ buddy,mmap
total 783657 3061
783657 pages is 3134628 kB (roughly consistent with the global counter,)
so it's OK.
[akpm@linux-foundation.org: update comment, per Naoya]
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/page-flags.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 19724e6ebd26..597695523679 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -593,6 +593,8 @@ static inline void __ClearPageBuddy(struct page *page) atomic_set(&page->_mapcount, -1); } +extern bool is_free_buddy_page(struct page *page); + #define PAGE_BALLOON_MAPCOUNT_VALUE (-256) static inline int PageBalloon(struct page *page) |