• Tejun Heo's avatar
    blkcg: cfq doesn't need per-cpu dispatch stats · 41b38b6d
    Tejun Heo authored
    blkio_group_stats_cpu is used to count dispatch stats using per-cpu
    counters.  This is used by both blk-throtl and cfq-iosched but the
    sharing is rather silly.
    * cfq-iosched doesn't need per-cpu dispatch stats.  cfq always updates
      those stats while holding queue_lock.
    * blk-throtl needs per-cpu dispatch stats but only service_bytes and
      serviced.  It doesn't make use of sectors.
    This patch makes cfq add and use global stats for service_bytes,
    serviced and sectors, removes per-cpu sectors counter and moves
    per-cpu stat printing code to blk-throttle.c.
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>