blkcg: don't use percpu for merged stats
With recent plug merge updates, merged stats are no longer called for
plug merges and now only updated while holding queue_lock. As
stats_lock is scheduled to be removed, there's no reason to use percpu
for merged stats. Don't use percpu for merged stats.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 1de32fe..6c8e3e3 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -29,10 +29,12 @@
#ifdef CONFIG_BLK_CGROUP
enum stat_type {
+ /* Number of IOs merged */
+ BLKIO_STAT_MERGED,
/* Total time spent (in ns) between request dispatch to the driver and
* request completion for IOs doen by this cgroup. This may not be
* accurate when NCQ is turned on. */
- BLKIO_STAT_SERVICE_TIME = 0,
+ BLKIO_STAT_SERVICE_TIME,
/* Total time spent waiting in scheduler queue in ns */
BLKIO_STAT_WAIT_TIME,
/* Number of IOs queued up */
@@ -57,8 +59,6 @@
BLKIO_STAT_CPU_SERVICE_BYTES,
/* Total IOs serviced, post merge */
BLKIO_STAT_CPU_SERVICED,
- /* Number of IOs merged */
- BLKIO_STAT_CPU_MERGED,
BLKIO_STAT_CPU_NR
};