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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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2
fs/f2fs/super.c
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@@ -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);