提交 e4ea0c16 编写于 作者: S Shaohua Li writes 提交者: Jens Axboe

block cfq: select new workload if priority changed

If priority is changed, continuing to check workload_expires and service tree
count of the previous workload does not make sense. We should always choose
the workload with lowest key of new priority in such case.
Signed-off-by: NShaohua Li <shaohua.li@intel.com>
Reviewed-by: NJeff Moyer <jmoyer@redhat.com>
Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
上级 760701bf
......@@ -2101,6 +2101,7 @@ static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg)
unsigned count;
struct cfq_rb_root *st;
unsigned group_slice;
enum wl_prio_t original_prio = cfqd->serving_prio;
if (!cfqg) {
cfqd->serving_prio = IDLE_WORKLOAD;
......@@ -2119,6 +2120,9 @@ static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg)
return;
}
if (original_prio != cfqd->serving_prio)
goto new_workload;
/*
* For RT and BE, we have to choose also the type
* (SYNC, SYNC_NOIDLE, ASYNC), and to compute a workload
......@@ -2133,6 +2137,7 @@ static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg)
if (count && !time_after(jiffies, cfqd->workload_expires))
return;
new_workload:
/* otherwise select new workload type */
cfqd->serving_type =
cfq_choose_wl(cfqd, cfqg, cfqd->serving_prio);
......
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