block cfq: don't use atomic_t for cfq_group
authorShaohua Li <shaohua.li@intel.com>
Fri, 7 Jan 2011 07:48:28 +0000 (08:48 +0100)
committerJens Axboe <jaxboe@fusionio.com>
Fri, 7 Jan 2011 07:48:28 +0000 (08:48 +0100)
commit329a67815b596d23daf0caa588ae0800e925320f
tree5fcf8a7c4a4d43b2cc7dc220d6bb25bdf27d153f
parent30d7b9448f03f2c82d0fd44738674cc156a8ce0a
block cfq: don't use atomic_t for cfq_group

cfq_group->ref is used with queue_lock hold, the only exception is
cfq_set_request, which looks like a bug to me, so ref doesn't need
to be an atomic and atomic operation is slower.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
block/cfq-iosched.c