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f2fs: use spinlock rather than mutex for better speed 

With the 2 previous changes, all the long time operations are moved out
of the protection region, so here we can use spinlock rather than mutex
(orphan_inode_mutex) for lower overhead.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Gu Zheng 2014-01-10 18:09:14 +08:00 committed by Jaegeuk Kim
parent c1ef372572
commit 17b692f60e
2 changed files with 13 additions and 13 deletions
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24
fs/f2fs/checkpoint.c
View File

@ -196,22 +196,22 @@ int acquire_orphan_inode(struct f2fs_sb_info *sbi)
{ {
int err = 0; int err = 0;
mutex_lock(&sbi->orphan_inode_mutex); spin_lock(&sbi->orphan_inode_lock);
if (unlikely(sbi->n_orphans >= sbi->max_orphans)) if (unlikely(sbi->n_orphans >= sbi->max_orphans))
err = -ENOSPC; err = -ENOSPC;
else else
sbi->n_orphans++; sbi->n_orphans++;
mutex_unlock(&sbi->orphan_inode_mutex); spin_unlock(&sbi->orphan_inode_lock);
return err; return err;
} }
void release_orphan_inode(struct f2fs_sb_info *sbi) void release_orphan_inode(struct f2fs_sb_info *sbi)
{ {
mutex_lock(&sbi->orphan_inode_mutex); spin_lock(&sbi->orphan_inode_lock);
f2fs_bug_on(sbi->n_orphans == 0); f2fs_bug_on(sbi->n_orphans == 0);
sbi->n_orphans--; sbi->n_orphans--;
mutex_unlock(&sbi->orphan_inode_mutex); spin_unlock(&sbi->orphan_inode_lock);
} }
void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
@ -222,12 +222,12 @@ void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
new = f2fs_kmem_cache_alloc(orphan_entry_slab, GFP_ATOMIC); new = f2fs_kmem_cache_alloc(orphan_entry_slab, GFP_ATOMIC);
new->ino = ino; new->ino = ino;
mutex_lock(&sbi->orphan_inode_mutex); spin_lock(&sbi->orphan_inode_lock);
head = &sbi->orphan_inode_list; head = &sbi->orphan_inode_list;
list_for_each(this, head) { list_for_each(this, head) {
orphan = list_entry(this, struct orphan_inode_entry, list); orphan = list_entry(this, struct orphan_inode_entry, list);
if (orphan->ino == ino) { if (orphan->ino == ino) {
mutex_unlock(&sbi->orphan_inode_mutex); spin_unlock(&sbi->orphan_inode_lock);
kmem_cache_free(orphan_entry_slab, new); kmem_cache_free(orphan_entry_slab, new);
return; return;
} }
@ -242,7 +242,7 @@ void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
list_add(&new->list, this->prev); list_add(&new->list, this->prev);
else else
list_add_tail(&new->list, head); list_add_tail(&new->list, head);
mutex_unlock(&sbi->orphan_inode_mutex); spin_unlock(&sbi->orphan_inode_lock);
} }
void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
@ -250,7 +250,7 @@ void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
struct list_head *head; struct list_head *head;
struct orphan_inode_entry *orphan; struct orphan_inode_entry *orphan;
mutex_lock(&sbi->orphan_inode_mutex); spin_lock(&sbi->orphan_inode_lock);
head = &sbi->orphan_inode_list; head = &sbi->orphan_inode_list;
list_for_each_entry(orphan, head, list) { list_for_each_entry(orphan, head, list) {
if (orphan->ino == ino) { if (orphan->ino == ino) {
@ -261,7 +261,7 @@ void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
break; break;
} }
} }
mutex_unlock(&sbi->orphan_inode_mutex); spin_unlock(&sbi->orphan_inode_lock);
} }
static void recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) static void recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
@ -318,7 +318,7 @@ static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
pages[index] = grab_meta_page(sbi, start_blk + index); pages[index] = grab_meta_page(sbi, start_blk + index);
index = 1; index = 1;
mutex_lock(&sbi->orphan_inode_mutex); spin_lock(&sbi->orphan_inode_lock);
head = &sbi->orphan_inode_list; head = &sbi->orphan_inode_list;
/* loop for each orphan inode entry and write them in Jornal block */ /* loop for each orphan inode entry and write them in Jornal block */
@ -357,7 +357,7 @@ static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
f2fs_put_page(page, 1); f2fs_put_page(page, 1);
} }
mutex_unlock(&sbi->orphan_inode_mutex); spin_unlock(&sbi->orphan_inode_lock);
} }
static struct page *validate_checkpoint(struct f2fs_sb_info *sbi, static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
@ -828,7 +828,7 @@ void write_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
void init_orphan_info(struct f2fs_sb_info *sbi) void init_orphan_info(struct f2fs_sb_info *sbi)
{ {
mutex_init(&sbi->orphan_inode_mutex); spin_lock_init(&sbi->orphan_inode_lock);
INIT_LIST_HEAD(&sbi->orphan_inode_list); INIT_LIST_HEAD(&sbi->orphan_inode_list);
sbi->n_orphans = 0; sbi->n_orphans = 0;
/* /*

2
fs/f2fs/f2fs.h
View File

@ -412,7 +412,7 @@ struct f2fs_sb_info {
/* for orphan inode management */ /* for orphan inode management */
struct list_head orphan_inode_list; /* orphan inode list */ struct list_head orphan_inode_list; /* orphan inode list */
struct mutex orphan_inode_mutex; /* for orphan inode list */ spinlock_t orphan_inode_lock; /* for orphan inode list */
unsigned int n_orphans; /* # of orphan inodes */ unsigned int n_orphans; /* # of orphan inodes */
unsigned int max_orphans; /* max orphan inodes */ unsigned int max_orphans; /* max orphan inodes */