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authorGui Jianfeng <guijianfeng@cn.fujitsu.com>2010-12-17 08:57:14 +0100
committerJens Axboe <jaxboe@fusionio.com>2010-12-17 08:57:14 +0100
commit7278c9c19bd85cf33213a2e0b538a18d3ac8ad00 (patch)
treee080ada1f8cc00fef4600976f8cf489cc94d1c03
parenta8adbe378b56acd5945df70753c7e8f6fe223304 (diff)
downloadlinux-linaro-precise-7278c9c19bd85cf33213a2e0b538a18d3ac8ad00.tar.gz
cfq-iosched: don't check cfqg in choose_service_tree()
When cfq_choose_cfqg() is called in select_queue(), there must be at least one backlogged CFQ queue waiting for dispatching, hence there must be at least one backlogged CFQ group on service tree. So we never call choose_service_tree() with cfqg == NULL. Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
-rw-r--r--block/cfq-iosched.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 9b186fd6bf4..c19d015ac5a 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -2103,12 +2103,6 @@ static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg)
unsigned group_slice;
enum wl_prio_t original_prio = cfqd->serving_prio;
- if (!cfqg) {
- cfqd->serving_prio = IDLE_WORKLOAD;
- cfqd->workload_expires = jiffies + 1;
- return;
- }
-
/* Choose next priority. RT > BE > IDLE */
if (cfq_group_busy_queues_wl(RT_WORKLOAD, cfqd, cfqg))
cfqd->serving_prio = RT_WORKLOAD;