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f2fs: remove writepages lock 

This patch removes writepages lock.
We can improve multi-threading performance.

tiobench, 32 threads, 4KB write per fsync on SSD
Before: 25.88 MB/s
After: 28.03 MB/s

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2016-05-20 22:50:29 -07:00
parent 69e9e42744
commit b93f771286
3 changed files with 0 additions and 9 deletions
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7
fs/f2fs/data.c
View File

@ -1443,7 +1443,6 @@ static int f2fs_write_data_pages(struct address_space *mapping,
{
struct inode *inode = mapping->host;
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
bool locked = false;
int ret;
long diff;
@ -1472,14 +1471,8 @@ static int f2fs_write_data_pages(struct address_space *mapping,
diff = nr_pages_to_write(sbi, DATA, wbc);
if (!S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_ALL) {
mutex_lock(&sbi->writepages);
locked = true;
}
ret = f2fs_write_cache_pages(mapping, wbc, __f2fs_writepage, mapping);
f2fs_submit_merged_bio_cond(sbi, inode, NULL, 0, DATA, WRITE);
if (locked)
mutex_unlock(&sbi->writepages);
remove_dirty_inode(inode);

1
fs/f2fs/f2fs.h
View File

@ -770,7 +770,6 @@ struct f2fs_sb_info {
struct mutex cp_mutex; /* checkpoint procedure lock */
struct rw_semaphore cp_rwsem; /* blocking FS operations */
struct rw_semaphore node_write; /* locking node writes */
struct mutex writepages; /* mutex for writepages() */
wait_queue_head_t cp_wait;
unsigned long last_time[MAX_TIME]; /* to store time in jiffies */
long interval_time[MAX_TIME]; /* to store thresholds */

1
fs/f2fs/super.c
View File

@ -1630,7 +1630,6 @@ try_onemore:
sbi->raw_super = raw_super;
sbi->valid_super_block = valid_super_block;
mutex_init(&sbi->gc_mutex);
mutex_init(&sbi->writepages);
mutex_init(&sbi->cp_mutex);
init_rwsem(&sbi->node_write);