diff options
Diffstat (limited to 'block/blk-throttle.c')
| -rw-r--r-- | block/blk-throttle.c | 73 |
1 files changed, 6 insertions, 67 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index c0b2263a222a..bd3e4b2c7a9d 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -133,11 +133,6 @@ struct throtl_grp { /* When did we start a new slice */ unsigned long slice_start[2]; unsigned long slice_end[2]; - - /* total bytes transferred */ - struct blkg_rwstat service_bytes; - /* total IOs serviced, post merge */ - struct blkg_rwstat serviced; }; struct throtl_data @@ -335,11 +330,7 @@ static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp, int node) tg = kzalloc_node(sizeof(*tg), gfp, node); if (!tg) - goto err; - - if (blkg_rwstat_init(&tg->service_bytes, gfp) || - blkg_rwstat_init(&tg->serviced, gfp)) - goto err_free_tg; + return NULL; throtl_service_queue_init(&tg->service_queue); @@ -355,13 +346,6 @@ static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp, int node) tg->iops[WRITE] = -1; return &tg->pd; - -err_free_tg: - blkg_rwstat_exit(&tg->serviced); - blkg_rwstat_exit(&tg->service_bytes); - kfree(tg); -err: - return NULL; } static void throtl_pd_init(struct blkg_policy_data *pd) @@ -419,19 +403,9 @@ static void throtl_pd_free(struct blkg_policy_data *pd) struct throtl_grp *tg = pd_to_tg(pd); del_timer_sync(&tg->service_queue.pending_timer); - blkg_rwstat_exit(&tg->serviced); - blkg_rwstat_exit(&tg->service_bytes); kfree(tg); } -static void throtl_pd_reset_stats(struct blkg_policy_data *pd) -{ - struct throtl_grp *tg = pd_to_tg(pd); - - blkg_rwstat_reset(&tg->service_bytes); - blkg_rwstat_reset(&tg->serviced); -} - static struct throtl_grp * throtl_rb_first(struct throtl_service_queue *parent_sq) { @@ -839,25 +813,6 @@ static bool tg_may_dispatch(struct throtl_grp *tg, struct bio *bio, return 0; } -static void throtl_update_dispatch_stats(struct blkcg_gq *blkg, u64 bytes, - int rw) -{ - struct throtl_grp *tg = blkg_to_tg(blkg); - unsigned long flags; - - /* - * Disabling interrupts to provide mutual exclusion between two - * writes on same cpu. It probably is not needed for 64bit. Not - * optimizing that case yet. - */ - local_irq_save(flags); - - blkg_rwstat_add(&tg->serviced, rw, 1); - blkg_rwstat_add(&tg->service_bytes, rw, bytes); - - local_irq_restore(flags); -} - static void throtl_charge_bio(struct throtl_grp *tg, struct bio *bio) { bool rw = bio_data_dir(bio); @@ -871,17 +826,9 @@ static void throtl_charge_bio(struct throtl_grp *tg, struct bio *bio) * more than once as a throttled bio will go through blk-throtl the * second time when it eventually gets issued. Set it when a bio * is being charged to a tg. - * - * Dispatch stats aren't recursive and each @bio should only be - * accounted by the @tg it was originally associated with. Let's - * update the stats when setting REQ_THROTTLED for the first time - * which is guaranteed to be for the @bio's original tg. */ - if (!(bio->bi_rw & REQ_THROTTLED)) { + if (!(bio->bi_rw & REQ_THROTTLED)) bio->bi_rw |= REQ_THROTTLED; - throtl_update_dispatch_stats(tg_to_blkg(tg), - bio->bi_iter.bi_size, bio->bi_rw); - } } /** @@ -1161,13 +1108,6 @@ static void blk_throtl_dispatch_work_fn(struct work_struct *work) } } -static int tg_print_rwstat(struct seq_file *sf, void *v) -{ - blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat, - &blkcg_policy_throtl, seq_cft(sf)->private, true); - return 0; -} - static u64 tg_prfill_conf_u64(struct seq_file *sf, struct blkg_policy_data *pd, int off) { @@ -1304,13 +1244,13 @@ static struct cftype throtl_files[] = { }, { .name = "throttle.io_service_bytes", - .private = offsetof(struct throtl_grp, service_bytes), - .seq_show = tg_print_rwstat, + .private = (unsigned long)&blkcg_policy_throtl, + .seq_show = blkg_print_stat_bytes, }, { .name = "throttle.io_serviced", - .private = offsetof(struct throtl_grp, serviced), - .seq_show = tg_print_rwstat, + .private = (unsigned long)&blkcg_policy_throtl, + .seq_show = blkg_print_stat_ios, }, { } /* terminate */ }; @@ -1329,7 +1269,6 @@ static struct blkcg_policy blkcg_policy_throtl = { .pd_init_fn = throtl_pd_init, .pd_online_fn = throtl_pd_online, .pd_free_fn = throtl_pd_free, - .pd_reset_stats_fn = throtl_pd_reset_stats, }; bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg, |