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f2fs: reduce competition among node page writes

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We do not need to block on ->node_write among different node page writers e.g.
fsync/flush, unless we have a node page writer from write_checkpoint.
So it's better use rw_semaphore instead of mutex type for ->node_write to
promote performance.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2014-07-03 18:58:39 +08:00 committed by Jaegeuk Kim
parent 65b85ccce0
commit b3582c6892
4 changed files with 7 additions and 7 deletions
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6
fs/f2fs/checkpoint.c
View file

@ -762,10 +762,10 @@ static void block_operations(struct f2fs_sb_info *sbi)
* until finishing nat/sit flush.
*/
retry_flush_nodes:
mutex_lock(&sbi->node_write);
down_write(&sbi->node_write);
if (get_pages(sbi, F2FS_DIRTY_NODES)) {
mutex_unlock(&sbi->node_write);
up_write(&sbi->node_write);
sync_node_pages(sbi, 0, &wbc);
goto retry_flush_nodes;
}
@ -774,7 +774,7 @@ static void block_operations(struct f2fs_sb_info *sbi)
static void unblock_operations(struct f2fs_sb_info *sbi)
{
mutex_unlock(&sbi->node_write);
up_write(&sbi->node_write);
f2fs_unlock_all(sbi);
}

2
fs/f2fs/f2fs.h
View file

@ -452,7 +452,7 @@ struct f2fs_sb_info {
struct inode *meta_inode; /* cache meta blocks */
struct mutex cp_mutex; /* checkpoint procedure lock */
struct rw_semaphore cp_rwsem; /* blocking FS operations */
struct mutex node_write; /* locking node writes */
struct rw_semaphore node_write; /* locking node writes */
struct mutex writepages; /* mutex for writepages() */
bool por_doing; /* recovery is doing or not */
wait_queue_head_t cp_wait;

4
fs/f2fs/node.c
View file

@ -1231,12 +1231,12 @@ static int f2fs_write_node_page(struct page *page,
if (wbc->for_reclaim)
goto redirty_out;
mutex_lock(&sbi->node_write);
down_read(&sbi->node_write);
set_page_writeback(page);
write_node_page(sbi, page, &fio, nid, ni.blk_addr, &new_addr);
set_node_addr(sbi, &ni, new_addr, is_fsync_dnode(page));
dec_page_count(sbi, F2FS_DIRTY_NODES);
mutex_unlock(&sbi->node_write);
up_read(&sbi->node_write);
unlock_page(page);
return 0;

2
fs/f2fs/super.c
View file

@ -953,7 +953,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
mutex_init(&sbi->gc_mutex);
mutex_init(&sbi->writepages);
mutex_init(&sbi->cp_mutex);
mutex_init(&sbi->node_write);
init_rwsem(&sbi->node_write);
sbi->por_doing = false;
spin_lock_init(&sbi->stat_lock);