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Date: Mon, 12 Apr 2010 18:11:58 -0400
From: Vivek Goyal <vgoyal@...hat.com>
To: Divyesh Shah <dpshah@...gle.com>
Cc: jens.axboe@...cle.com, linux-kernel@...r.kernel.org,
nauman@...gle.com, ctalbott@...gle.com
Subject: Re: [PATCH][v2] Changes to more io-controller stats patches to
address review comments.
On Mon, Apr 12, 2010 at 11:41:49AM -0700, Divyesh Shah wrote:
> Changelog from v1:
> o Call blkiocg_update_idle_time_stats() at cfq_rq_enqueued() instead of at
> dispatch time.
>
> Changelog from original patchset: (in response to Vivek Goyal's comments)
> o group blkiocg_update_blkio_group_dequeue_stats() with other DEBUG functions
> o rename blkiocg_update_set_active_queue_stats() to
> blkiocg_update_avg_queue_size_stats()
> o s/request/io/ in blkiocg_update_request_add_stats() and
> blkiocg_update_request_remove_stats()
> o Call cfq_del_timer() at request dispatch() instead of
> blkiocg_update_idle_time_stats()
>
> Signed-off-by: Divyesh Shah<dpshah@...gle.com>
> ---
Looks good to me.
Acked-by: Vivek Goyal <vgoyal@...hat.com>
Thanks
Vivek
>
> block/blk-cgroup.c | 28 +++++++++++++---------------
> block/blk-cgroup.h | 12 ++++++------
> block/cfq-iosched.c | 20 +++++++++-----------
> 3 files changed, 28 insertions(+), 32 deletions(-)
>
> diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
> index 1ecff7a..fd428c1 100644
> --- a/block/blk-cgroup.c
> +++ b/block/blk-cgroup.c
> @@ -175,7 +175,7 @@ void blkiocg_update_idle_time_stats(struct blkio_group *blkg)
> }
> EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats);
>
> -void blkiocg_update_set_active_queue_stats(struct blkio_group *blkg)
> +void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg)
> {
> unsigned long flags;
> struct blkio_group_stats *stats;
> @@ -189,14 +189,21 @@ void blkiocg_update_set_active_queue_stats(struct blkio_group *blkg)
> blkio_update_group_wait_time(stats);
> spin_unlock_irqrestore(&blkg->stats_lock, flags);
> }
> -EXPORT_SYMBOL_GPL(blkiocg_update_set_active_queue_stats);
> +EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats);
> +
> +void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
> + unsigned long dequeue)
> +{
> + blkg->stats.dequeue += dequeue;
> +}
> +EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats);
> #else
> static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg,
> struct blkio_group *curr_blkg) {}
> static inline void blkio_end_empty_time(struct blkio_group_stats *stats) {}
> #endif
>
> -void blkiocg_update_request_add_stats(struct blkio_group *blkg,
> +void blkiocg_update_io_add_stats(struct blkio_group *blkg,
> struct blkio_group *curr_blkg, bool direction,
> bool sync)
> {
> @@ -209,9 +216,9 @@ void blkiocg_update_request_add_stats(struct blkio_group *blkg,
> blkio_set_start_group_wait_time(blkg, curr_blkg);
> spin_unlock_irqrestore(&blkg->stats_lock, flags);
> }
> -EXPORT_SYMBOL_GPL(blkiocg_update_request_add_stats);
> +EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats);
>
> -void blkiocg_update_request_remove_stats(struct blkio_group *blkg,
> +void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
> bool direction, bool sync)
> {
> unsigned long flags;
> @@ -221,7 +228,7 @@ void blkiocg_update_request_remove_stats(struct blkio_group *blkg,
> direction, sync);
> spin_unlock_irqrestore(&blkg->stats_lock, flags);
> }
> -EXPORT_SYMBOL_GPL(blkiocg_update_request_remove_stats);
> +EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats);
>
> void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time)
> {
> @@ -602,15 +609,6 @@ SHOW_FUNCTION_PER_GROUP(empty_time, BLKIO_STAT_EMPTY_TIME, 0);
> #endif
> #undef SHOW_FUNCTION_PER_GROUP
>
> -#ifdef CONFIG_DEBUG_BLK_CGROUP
> -void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
> - unsigned long dequeue)
> -{
> - blkg->stats.dequeue += dequeue;
> -}
> -EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats);
> -#endif
> -
> struct cftype blkio_files[] = {
> {
> .name = "weight",
> diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
> index bfce085..18e031a 100644
> --- a/block/blk-cgroup.h
> +++ b/block/blk-cgroup.h
> @@ -159,7 +159,7 @@ static inline char *blkg_path(struct blkio_group *blkg)
> {
> return blkg->path;
> }
> -void blkiocg_update_set_active_queue_stats(struct blkio_group *blkg);
> +void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
> void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
> unsigned long dequeue);
> void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
> @@ -188,7 +188,7 @@ BLKG_FLAG_FNS(empty)
> #undef BLKG_FLAG_FNS
> #else
> static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
> -static inline void blkiocg_update_set_active_queue_stats(
> +static inline void blkiocg_update_avg_queue_size_stats(
> struct blkio_group *blkg) {}
> static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
> unsigned long dequeue) {}
> @@ -216,9 +216,9 @@ void blkiocg_update_completion_stats(struct blkio_group *blkg,
> uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
> void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
> bool sync);
> -void blkiocg_update_request_add_stats(struct blkio_group *blkg,
> +void blkiocg_update_io_add_stats(struct blkio_group *blkg,
> struct blkio_group *curr_blkg, bool direction, bool sync);
> -void blkiocg_update_request_remove_stats(struct blkio_group *blkg,
> +void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
> bool direction, bool sync);
> #else
> struct cgroup;
> @@ -243,9 +243,9 @@ static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
> bool sync) {}
> static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
> bool direction, bool sync) {}
> -static inline void blkiocg_update_request_add_stats(struct blkio_group *blkg,
> +static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
> struct blkio_group *curr_blkg, bool direction, bool sync) {}
> -static inline void blkiocg_update_request_remove_stats(struct blkio_group *blkg,
> +static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
> bool direction, bool sync) {}
> #endif
> #endif /* _BLK_CGROUP_H */
> diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
> index b6e095c..cda6b29 100644
> --- a/block/cfq-iosched.c
> +++ b/block/cfq-iosched.c
> @@ -1381,10 +1381,10 @@ 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),
> + blkiocg_update_io_remove_stats(&cfqq->cfqg->blkg, rq_data_dir(rq),
> rq_is_sync(rq));
> cfq_add_rq_rb(rq);
> - blkiocg_update_request_add_stats(
> + blkiocg_update_io_add_stats(
> &cfqq->cfqg->blkg, &cfqq->cfqd->serving_group->blkg,
> rq_data_dir(rq), rq_is_sync(rq));
> }
> @@ -1442,7 +1442,7 @@ 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),
> + blkiocg_update_io_remove_stats(&cfqq->cfqg->blkg, rq_data_dir(rq),
> rq_is_sync(rq));
> if (rq_is_meta(rq)) {
> WARN_ON(!cfqq->meta_pending);
> @@ -1541,7 +1541,7 @@ 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);
> + blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg);
> cfqq->slice_start = 0;
> cfqq->dispatch_start = jiffies;
> cfqq->allocated_slice = 0;
> @@ -2395,11 +2395,6 @@ static int cfq_dispatch_requests(struct request_queue *q, int force)
> }
>
> cfq_log_cfqq(cfqd, cfqq, "dispatched a request");
> - /*
> - * This is needed since we don't exactly match the mod_timer() and
> - * del_timer() calls in CFQ.
> - */
> - blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg);
> return 1;
> }
>
> @@ -3208,8 +3203,11 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
> cfq_del_timer(cfqd, cfqq);
> cfq_clear_cfqq_wait_request(cfqq);
> __blk_run_queue(cfqd->queue);
> - } else
> + } else {
> + blkiocg_update_idle_time_stats(
> + &cfqq->cfqg->blkg);
> cfq_mark_cfqq_must_dispatch(cfqq);
> + }
> }
> } else if (cfq_should_preempt(cfqd, cfqq, rq)) {
> /*
> @@ -3235,7 +3233,7 @@ 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,
> + blkiocg_update_io_add_stats(&cfqq->cfqg->blkg,
> &cfqd->serving_group->blkg, rq_data_dir(rq),
> rq_is_sync(rq));
> cfq_rq_enqueued(cfqd, cfqq, rq);
--
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