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| author | Justin TerAvest <teravest@google.com> | 2011-03-23 08:25:44 +0100 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-03-23 08:25:44 +0100 |
| commit | 62a37f6badd1ac97ba07d543b5d4be2f9cb17217 (patch) | |
| tree | b659ac7b4c9fce787694bb8a33affa229d1cd552 /block | |
| parent | 04521db04e9a11e74b0252d222051cb194487f4d (diff) | |
| download | linux-62a37f6badd1ac97ba07d543b5d4be2f9cb17217.tar.gz linux-62a37f6badd1ac97ba07d543b5d4be2f9cb17217.tar.bz2 linux-62a37f6badd1ac97ba07d543b5d4be2f9cb17217.zip | |
cfq-iosched: Don't clear queue stats when preempt.
For v2, I added back lines to cfq_preempt_queue() that were removed
during updates for accounting unaccounted_time. Thanks for pointing out
that I'd missed these, Vivek.
Previous commit "cfq-iosched: Don't set active queue in preempt" wrongly
cleared stats for preempting queues when it shouldn't have, because when
we choose a queue to preempt, it still isn't necessarily scheduled next.
Thanks to Vivek Goyal for figuring this out and understanding how the
preemption code works.
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.c | 39 |
1 files changed, 17 insertions, 22 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 69208d732903..fea1b5a9b7e9 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1620,33 +1620,27 @@ 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_clear_queue_stats(cfqd, 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); } cfqd->active_queue = cfqq; @@ -3339,7 +3333,8 @@ static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) cfq_service_tree_add(cfqd, cfqq, 1); - cfq_clear_queue_stats(cfqd, cfqq); + cfqq->slice_end = 0; + cfq_mark_cfqq_slice_new(cfqq); } /* |