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authorJoonsoo Kim <iamjoonsoo.kim@lge.com>2014-04-03 14:47:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-03 16:20:59 -0700
commit9119a41e9091fb3a8204039d595bcdae24193c57 (patch)
treea4d8e613724f22581512820756f97048883f50fc /include/linux/hugetlb.h
parentd26914d11751b23ca2e8747725f2cae10c2f2c1b (diff)
mm, hugetlb: unify region structure handling
Currently, to track reserved and allocated regions, we use two different ways, depending on the mapping. For MAP_SHARED, we use address_mapping's private_list and, while for MAP_PRIVATE, we use a resv_map. Now, we are preparing to change a coarse grained lock which protect a region structure to fine grained lock, and this difference hinder it. So, before changing it, unify region structure handling, consistently using a resv_map regardless of the kind of mapping. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Davidlohr Bueso <davidlohr@hp.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: David Gibson <david@gibson.dropbear.id.au> 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.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 8c43cc469d78..f62c2f6c6059 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -6,6 +6,8 @@
#include <linux/fs.h>
#include <linux/hugetlb_inline.h>
#include <linux/cgroup.h>
+#include <linux/list.h>
+#include <linux/kref.h>
struct ctl_table;
struct user_struct;
@@ -23,6 +25,13 @@ struct hugepage_subpool {
long max_hpages, used_hpages;
};
+struct resv_map {
+ struct kref refs;
+ struct list_head regions;
+};
+extern struct resv_map *resv_map_alloc(void);
+void resv_map_release(struct kref *ref);
+
extern spinlock_t hugetlb_lock;
extern int hugetlb_max_hstate __read_mostly;
#define for_each_hstate(h) \