diff options
author | Mel Gorman <mel@csn.ul.ie> | 2009-01-06 17:38:53 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-06 18:58:58 -0500 |
commit | 08fba69986e20c1c9e5fe2e6064d146cc4f42480 (patch) | |
tree | 40bd36a6778624527d91ede0eb51aa5b99aab01c /mm/hugetlb.c | |
parent | 238c6d54830c624f34ac9cf123ac04aebfca5013 (diff) |
mm: report the pagesize backing a VMA in /proc/pid/smaps
It is useful to verify a hugepage-aware application is using the expected
pagesizes for its memory regions. This patch creates an entry called
KernelPageSize in /proc/pid/smaps that is the size of page used by the
kernel to back a VMA. The entry is not called PageSize as it is possible
the MMU uses a different size. This extension should not break any sensible
parser that skips lines containing unrecognised information.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r-- | mm/hugetlb.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 6058b53dcb8..5cb8bc7c80f 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c | |||
@@ -220,6 +220,22 @@ static pgoff_t vma_hugecache_offset(struct hstate *h, | |||
220 | } | 220 | } |
221 | 221 | ||
222 | /* | 222 | /* |
223 | * Return the size of the pages allocated when backing a VMA. In the majority | ||
224 | * cases this will be same size as used by the page table entries. | ||
225 | */ | ||
226 | unsigned long vma_kernel_pagesize(struct vm_area_struct *vma) | ||
227 | { | ||
228 | struct hstate *hstate; | ||
229 | |||
230 | if (!is_vm_hugetlb_page(vma)) | ||
231 | return PAGE_SIZE; | ||
232 | |||
233 | hstate = hstate_vma(vma); | ||
234 | |||
235 | return 1UL << (hstate->order + PAGE_SHIFT); | ||
236 | } | ||
237 | |||
238 | /* | ||
223 | * Flags for MAP_PRIVATE reservations. These are stored in the bottom | 239 | * Flags for MAP_PRIVATE reservations. These are stored in the bottom |
224 | * bits of the reservation map pointer, which are always clear due to | 240 | * bits of the reservation map pointer, which are always clear due to |
225 | * alignment. | 241 | * alignment. |