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mm, hugetlb: unify region structure handling

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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>
This commit is contained in:
Joonsoo Kim 2014-04-03 14:47:25 -07:00 • committed by Linus Torvalds
parent d26914d117
commit 9119a41e90
3 changed files with 45 additions and 18 deletions
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9
include/linux/hugetlb.h
View file

@ -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) \