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-rw-r--r--fs/fs-writeback.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 587ac08eabb6..091a36444972 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1481,6 +1481,21 @@ static long writeback_sb_inodes(struct super_block *sb,
wbc_detach_inode(&wbc);
work->nr_pages -= write_chunk - wbc.nr_to_write;
wrote += write_chunk - wbc.nr_to_write;
+
+ if (need_resched()) {
+ /*
+ * We're trying to balance between building up a nice
+ * long list of IOs to improve our merge rate, and
+ * getting those IOs out quickly for anyone throttling
+ * in balance_dirty_pages(). cond_resched() doesn't
+ * unplug, so get our IOs out the door before we
+ * give up the CPU.
+ */
+ blk_flush_plug(current);
+ cond_resched();
+ }
+
+
spin_lock(&wb->list_lock);
spin_lock(&inode->i_lock);
if (!(inode->i_state & I_DIRTY_ALL))
@@ -1488,7 +1503,7 @@ static long writeback_sb_inodes(struct super_block *sb,
requeue_inode(inode, wb, &wbc);
inode_sync_complete(inode);
spin_unlock(&inode->i_lock);
- cond_resched_lock(&wb->list_lock);
+
/*
* bail out to wb_writeback() often enough to check
* background threshold and other termination conditions.