ext4: Use single thread to perform DIO unwritten convertion
While running ext4 testing on multiple core, we found there are per
cpu ext4-dio-unwritten threads processing conversion from unwritten
extents to written for IOs completed from async direct IO patch. Per
filesystem is enough, we don't need per cpu threads to work on
conversion.
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9eaec22..b357c27 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3514,7 +3514,7 @@
percpu_counter_set(&sbi->s_dirtyblocks_counter, 0);
no_journal:
- EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
+ EXT4_SB(sb)->dio_unwritten_wq = create_singlethread_workqueue("ext4-dio-unwritten");
if (!EXT4_SB(sb)->dio_unwritten_wq) {
printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
goto failed_mount_wq;