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| author | Divyesh Shah <dpshah@google.com> | 2010-04-08 21:15:10 -0700 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-04-09 08:36:08 +0200 |
| commit | cdc1184cf4a7bd99f5473a91244197accc49146b (patch) | |
| tree | ecd572867bfa5a82fa4ed16d7303448c7ea7d24c /block/cfq-iosched.c | |
| parent | 812d402648f4fc1ab1091b2172a46fc1b367c724 (diff) | |
| download | lwn-cdc1184cf4a7bd99f5473a91244197accc49146b.tar.gz lwn-cdc1184cf4a7bd99f5473a91244197accc49146b.zip | |
blkio: Add io_queued and avg_queue_size stats
These stats are useful for getting a feel for the queue depth of the cgroup,
i.e., how filled up its queues are at a given instant and over the existence of
the cgroup. This ability is useful when debugging problems in the wild as it
helps understand the application's IO pattern w/o having to read through the
userspace code (coz its tedious or just not available) or w/o the ability
to run blktrace (since you may not have root access and/or not want to disturb
performance).
Signed-off-by: Divyesh Shah<dpshah@google.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 4eb1906cf6c6..8e0b86a9111a 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1380,7 +1380,12 @@ static void cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq) { elv_rb_del(&cfqq->sort_list, rq); cfqq->queued[rq_is_sync(rq)]--; + blkiocg_update_request_remove_stats(&cfqq->cfqg->blkg, rq_data_dir(rq), + rq_is_sync(rq)); cfq_add_rq_rb(rq); + blkiocg_update_request_add_stats( + &cfqq->cfqg->blkg, &cfqq->cfqd->serving_group->blkg, + rq_data_dir(rq), rq_is_sync(rq)); } static struct request * @@ -1436,6 +1441,8 @@ static void cfq_remove_request(struct request *rq) cfq_del_rq_rb(rq); cfqq->cfqd->rq_queued--; + blkiocg_update_request_remove_stats(&cfqq->cfqg->blkg, rq_data_dir(rq), + rq_is_sync(rq)); if (rq_is_meta(rq)) { WARN_ON(!cfqq->meta_pending); cfqq->meta_pending--; @@ -1527,6 +1534,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd, if (cfqq) { cfq_log_cfqq(cfqd, cfqq, "set_active wl_prio:%d wl_type:%d", cfqd->serving_prio, cfqd->serving_type); + blkiocg_update_set_active_queue_stats(&cfqq->cfqg->blkg); cfqq->slice_start = 0; cfqq->dispatch_start = jiffies; cfqq->allocated_slice = 0; @@ -3213,6 +3221,9 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq) list_add_tail(&rq->queuelist, &cfqq->fifo); cfq_add_rq_rb(rq); + blkiocg_update_request_add_stats(&cfqq->cfqg->blkg, + &cfqd->serving_group->blkg, rq_data_dir(rq), + rq_is_sync(rq)); cfq_rq_enqueued(cfqd, cfqq, rq); } |