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Commit c4e7893e authored by Vivek Goyal's avatar Vivek Goyal Committed by Jens Axboe
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cfq-iosched: blktrace print per slice sector stats 



o Divyesh had gotten rid of this code in the past. I want to re-introduce it
  back as it helps me a lot during debugging.

Reviewed-by: default avatarJeff Moyer <jmoyer@redhat.com>
Reviewed-by: default avatarDivyesh Shah <dpshah@google.com>
Signed-off-by: default avatarVivek Goyal <vgoyal@redhat.com>
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent 80bdf0c7

block/cfq-iosched.c

+7 −2
Original line number Diff line number Diff line
@@ -148,6 +148,8 @@ struct cfq_queue { 
	struct cfq_queue *new_cfqq;

	struct cfq_group *cfqg;

	struct cfq_group *orig_cfqg;

	/* Number of sectors dispatched from queue in single dispatch round */

	unsigned long nr_sectors;

};



/*
@@ -960,8 +962,9 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg, 


	cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime,

					st->min_vdisktime);

	cfq_log_cfqq(cfqq->cfqd, cfqq, "sl_used=%u disp=%u charge=%u iops=%u",

			used_sl, cfqq->slice_dispatch, charge, iops_mode(cfqd));

	cfq_log_cfqq(cfqq->cfqd, cfqq, "sl_used=%u disp=%u charge=%u iops=%u"

			" sect=%u", used_sl, cfqq->slice_dispatch, charge,

			iops_mode(cfqd), cfqq->nr_sectors);

	cfq_blkiocg_update_timeslice_used(&cfqg->blkg, used_sl);

	cfq_blkiocg_set_start_empty_time(&cfqg->blkg);

}
@@ -1609,6 +1612,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd, 
		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);
@@ -1971,6 +1975,7 @@ static void cfq_dispatch_insert(struct request_queue *q, struct request *rq) 
	elv_dispatch_sort(q, rq);



	cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++;

	cfqq->nr_sectors += blk_rq_sectors(rq);

	cfq_blkiocg_update_dispatch_stats(&cfqq->cfqg->blkg, blk_rq_bytes(rq),

					rq_data_dir(rq), rq_is_sync(rq));

}