Btrfs: Lower contention on the csum mutex
This takes the csum mutex deeper in the call chain and releases it
more often.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 1aed1f4..92e14dd 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1386,7 +1386,14 @@
* devices
*/
fs_info->submit_workers.idle_thresh = 64;
- fs_info->workers.idle_thresh = 32;
+
+ /* fs_info->workers is responsible for checksumming file data
+ * blocks and metadata. Using a larger idle thresh allows each
+ * worker thread to operate on things in roughly the order they
+ * were sent by the writeback daemons, improving overall locality
+ * of the IO going down the pipe.
+ */
+ fs_info->workers.idle_thresh = 128;
btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1);
btrfs_init_workers(&fs_info->endio_workers, "endio",
