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authorEric B Munson <ebmunson@us.ibm.com>2009-09-21 17:03:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 07:17:42 -0700
commit4e52780d41a741fb4861ae1df2413dd816ec11b1 (patch)
treeb3722349661ed0ce87841b110f568616892cf719 /include/linux/hugetlb.h
parent90f72aa58bbf076b68e289fbd71eb829bc505923 (diff)
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op-kernel-dev-4e52780d41a741fb4861ae1df2413dd816ec11b1.tar.gz
hugetlb: add MAP_HUGETLB for mmaping pseudo-anonymous huge page regions
Add a flag for mmap that will be used to request a huge page region that will look like anonymous memory to userspace. This is accomplished by using a file on the internal vfsmount. MAP_HUGETLB is a modifier of MAP_ANONYMOUS and so must be specified with it. The region will behave the same as a MAP_ANONYMOUS region using small pages. [akpm@linux-foundation.org: fix arch definitions of MAP_HUGETLB] Signed-off-by: Eric B Munson <ebmunson@us.ibm.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Adam Litke <agl@us.ibm.com> Cc: David Gibson <david@gibson.dropbear.id.au> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Arnd Bergmann <arnd@arndb.de> 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.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index f6505ad..176e7ee 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -112,12 +112,19 @@ static inline void hugetlb_report_meminfo(struct seq_file *m)
#endif /* !CONFIG_HUGETLB_PAGE */
+#define HUGETLB_ANON_FILE "anon_hugepage"
+
enum {
/*
* The file will be used as an shm file so shmfs accounting rules
* apply
*/
HUGETLB_SHMFS_INODE = 1,
+ /*
+ * The file is being created on the internal vfs mount and shmfs
+ * accounting rules do not apply
+ */
+ HUGETLB_ANONHUGE_INODE = 2,
};
#ifdef CONFIG_HUGETLBFS
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