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authorJustin TerAvest <teravest@google.com>2011-03-22 21:26:49 +0100
committerJens Axboe <jaxboe@fusionio.com>2011-03-22 21:26:49 +0100
commiteda5e0c91fed2d2a38a341b0957263406d330274 (patch)
treed09564b4ef18dc8f9703a3d67def655b24b992c8 /block
parent1e9bb8808ac11094d711d20d580e7b45a4992d0c (diff)
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cfq-iosched: Don't set active queue in preempt
Commit "Add unaccounted time to timeslice_used" changed the behavior of cfq_preempt_queue to set cfqq active. Vivek pointed out that other preemption rules might get involved, so we shouldn't manually set which queue is active. This cleans up the code to just clear the queue stats at preemption time. Signed-off-by: Justin TerAvest <teravest@google.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block')
-rw-r--r--block/cfq-iosched.c39
1 files changed, 23 insertions, 16 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 12e380b..69208d7 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1620,27 +1620,33 @@ static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq)
cfq_blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg);
}
+static void cfq_clear_queue_stats(struct cfq_data *cfqd,
+ struct cfq_queue *cfqq)
+{
+ cfq_blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg);
+ cfqq->slice_start = 0;
+ cfqq->dispatch_start = jiffies;
+ cfqq->allocated_slice = 0;
+ cfqq->slice_end = 0;
+ cfqq->slice_dispatch = 0;
+ cfqq->nr_sectors = 0;
+
+ cfq_clear_cfqq_wait_request(cfqq);
+ cfq_clear_cfqq_must_dispatch(cfqq);
+ cfq_clear_cfqq_must_alloc_slice(cfqq);
+ cfq_clear_cfqq_fifo_expire(cfqq);
+ cfq_mark_cfqq_slice_new(cfqq);
+
+ cfq_del_timer(cfqd, cfqq);
+}
+
static void __cfq_set_active_queue(struct cfq_data *cfqd,
struct cfq_queue *cfqq)
{
if (cfqq) {
cfq_log_cfqq(cfqd, cfqq, "set_active wl_prio:%d wl_type:%d",
cfqd->serving_prio, cfqd->serving_type);
- cfq_blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg);
- cfqq->slice_start = 0;
- cfqq->dispatch_start = jiffies;
- cfqq->allocated_slice = 0;
- cfqq->slice_end = 0;
- cfqq->slice_dispatch = 0;
- cfqq->nr_sectors = 0;
-
- cfq_clear_cfqq_wait_request(cfqq);
- cfq_clear_cfqq_must_dispatch(cfqq);
- cfq_clear_cfqq_must_alloc_slice(cfqq);
- cfq_clear_cfqq_fifo_expire(cfqq);
- cfq_mark_cfqq_slice_new(cfqq);
-
- cfq_del_timer(cfqd, cfqq);
+ cfq_clear_queue_stats(cfqd, cfqq);
}
cfqd->active_queue = cfqq;
@@ -3332,7 +3338,8 @@ static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq)
BUG_ON(!cfq_cfqq_on_rr(cfqq));
cfq_service_tree_add(cfqd, cfqq, 1);
- __cfq_set_active_queue(cfqd, cfqq);
+
+ cfq_clear_queue_stats(cfqd, cfqq);
}
/*