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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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17
fs/hugetlbfs/inode.c
View File

@ -366,7 +366,13 @@ static void truncate_hugepages(struct inode *inode, loff_t lstart)
static void hugetlbfs_evict_inode(struct inode *inode)
{
struct resv_map *resv_map;
truncate_hugepages(inode, 0);
resv_map = (struct resv_map *)inode->i_mapping->private_data;
/* root inode doesn't have the resv_map, so we should check it */
if (resv_map)
resv_map_release(&resv_map->refs);
clear_inode(inode);
}
@ -476,6 +482,11 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb,
umode_t mode, dev_t dev)
{
struct inode *inode;
struct resv_map *resv_map;
resv_map = resv_map_alloc();
if (!resv_map)
return NULL;
inode = new_inode(sb);
if (inode) {
@ -487,7 +498,7 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb,
inode->i_mapping->a_ops = &hugetlbfs_aops;
inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
INIT_LIST_HEAD(&inode->i_mapping->private_list);
inode->i_mapping->private_data = resv_map;
info = HUGETLBFS_I(inode);
/*
* The policy is initialized here even if we are creating a
@ -517,7 +528,9 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb,
break;
}
lockdep_annotate_inode_mutex_key(inode);
}
} else
kref_put(&resv_map->refs, resv_map_release);
return inode;
}

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) \

37
mm/hugetlb.c
View File

@ -376,12 +376,7 @@ static void set_vma_private_data(struct vm_area_struct *vma,
vma->vm_private_data = (void *)value;
}
struct resv_map {
struct kref refs;
struct list_head regions;
};
static struct resv_map *resv_map_alloc(void)
struct resv_map *resv_map_alloc(void)
{
struct resv_map *resv_map = kmalloc(sizeof(*resv_map), GFP_KERNEL);
if (!resv_map)
@ -393,7 +388,7 @@ static struct resv_map *resv_map_alloc(void)
return resv_map;
}
static void resv_map_release(struct kref *ref)
void resv_map_release(struct kref *ref)
{
struct resv_map *resv_map = container_of(ref, struct resv_map, refs);
@ -1155,8 +1150,9 @@ static long vma_needs_reservation(struct hstate *h,
if (vma->vm_flags & VM_MAYSHARE) {
pgoff_t idx = vma_hugecache_offset(h, vma, addr);
return region_chg(&inode->i_mapping->private_list,
idx, idx + 1);
struct resv_map *resv = inode->i_mapping->private_data;
return region_chg(&resv->regions, idx, idx + 1);
} else if (!is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
return 1;
@ -1180,7 +1176,9 @@ static void vma_commit_reservation(struct hstate *h,
if (vma->vm_flags & VM_MAYSHARE) {
pgoff_t idx = vma_hugecache_offset(h, vma, addr);
region_add(&inode->i_mapping->private_list, idx, idx + 1);
struct resv_map *resv = inode->i_mapping->private_data;
region_add(&resv->regions, idx, idx + 1);
} else if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
pgoff_t idx = vma_hugecache_offset(h, vma, addr);
@ -3161,6 +3159,7 @@ int hugetlb_reserve_pages(struct inode *inode,
long ret, chg;
struct hstate *h = hstate_inode(inode);
struct hugepage_subpool *spool = subpool_inode(inode);
struct resv_map *resv_map;
/*
* Only apply hugepage reservation if asked. At fault time, an
@ -3176,10 +3175,13 @@ int hugetlb_reserve_pages(struct inode *inode,
* to reserve the full area even if read-only as mprotect() may be
* called to make the mapping read-write. Assume !vma is a shm mapping
*/
if (!vma || vma->vm_flags & VM_MAYSHARE)
chg = region_chg(&inode->i_mapping->private_list, from, to);
else {
struct resv_map *resv_map = resv_map_alloc();
if (!vma || vma->vm_flags & VM_MAYSHARE) {
resv_map = inode->i_mapping->private_data;
chg = region_chg(&resv_map->regions, from, to);
} else {
resv_map = resv_map_alloc();
if (!resv_map)
return -ENOMEM;
@ -3222,7 +3224,7 @@ int hugetlb_reserve_pages(struct inode *inode,
* else has to be done for private mappings here
*/
if (!vma || vma->vm_flags & VM_MAYSHARE)
region_add(&inode->i_mapping->private_list, from, to);
region_add(&resv_map->regions, from, to);
return 0;
out_err:
if (vma)
@ -3233,9 +3235,12 @@ int hugetlb_reserve_pages(struct inode *inode,
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed)
{
struct hstate *h = hstate_inode(inode);
long chg = region_truncate(&inode->i_mapping->private_list, offset);
struct resv_map *resv_map = inode->i_mapping->private_data;
long chg = 0;
struct hugepage_subpool *spool = subpool_inode(inode);
if (resv_map)
chg = region_truncate(&resv_map->regions, offset);
spin_lock(&inode->i_lock);
inode->i_blocks -= (blocks_per_huge_page(h) * freed);
spin_unlock(&inode->i_lock);