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| author | Chao Yu <chao2.yu@samsung.com> | 2014-07-03 18:58:39 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2014-07-30 23:28:37 -0700 |
| commit | b3582c68920105e29d219714d8a6fbde25a43379 (patch) | |
| tree | 200ab9ca194921c8baad9954fee36eee072a772f /fs | |
| parent | 65b85ccce03f17b3098273192b20885f3fead820 (diff) | |
| download | lwn-b3582c68920105e29d219714d8a6fbde25a43379.tar.gz lwn-b3582c68920105e29d219714d8a6fbde25a43379.zip | |
f2fs: reduce competition among node page writes
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/f2fs/checkpoint.c | 6 | ||||
| -rw-r--r-- | fs/f2fs/f2fs.h | 2 | ||||
| -rw-r--r-- | fs/f2fs/node.c | 4 | ||||
| -rw-r--r-- | fs/f2fs/super.c | 2 |
4 files changed, 7 insertions, 7 deletions
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index cea20b810f44..6aeed5bada52 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -762,10 +762,10 @@ retry_flush_dents: * 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 @@ retry_flush_nodes: static void unblock_operations(struct f2fs_sb_info *sbi) { - mutex_unlock(&sbi->node_write); + up_write(&sbi->node_write); f2fs_unlock_all(sbi); } diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 80c78695546d..99425675c2f8 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -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; diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index a90f51d32482..7b5b5def65fe 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -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; diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index f253e222dcea..657582fc7601 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -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); |