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authorMel Gorman <mel@csn.ul.ie>2009-01-06 14:38:53 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 15:58:58 -0800
commit08fba69986e20c1c9e5fe2e6064d146cc4f42480 (patch)
tree40bd36a6778624527d91ede0eb51aa5b99aab01c /include/linux/hugetlb.h
parent238c6d54830c624f34ac9cf123ac04aebfca5013 (diff)
downloadop-kernel-dev-08fba69986e20c1c9e5fe2e6064d146cc4f42480.zip
op-kernel-dev-08fba69986e20c1c9e5fe2e6064d146cc4f42480.tar.gz
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 'include/linux/hugetlb.h')
-rw-r--r--include/linux/hugetlb.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index e1c8afc..648e1e2 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -233,6 +233,8 @@ static inline unsigned long huge_page_size(struct hstate *h)
return (unsigned long)PAGE_SIZE << h->order;
}
+extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
+
static inline unsigned long huge_page_mask(struct hstate *h)
{
return h->mask;
@@ -273,6 +275,7 @@ struct hstate {};
#define hstate_inode(i) NULL
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
+#define vma_kernel_pagesize(v) PAGE_SIZE
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
static inline unsigned int pages_per_huge_page(struct hstate *h)
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