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SubjectRe: [PATCH v3] blk-throttle: Fix io statistics for cgroup v1
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Hi,Jens

Can you consider merging this patch?I think this is a fix. It also
Acked-by Tejun, Muchun Song and Tested-by Andrea Righi.

在 2023/5/8 上午1:06, Jinke Han 写道:
> From: Jinke Han <hanjinke.666@bytedance.com>
>
> After commit f382fb0bcef4 ("block: remove legacy IO schedulers"),
> blkio.throttle.io_serviced and blkio.throttle.io_service_bytes become
> the only stable io stats interface of cgroup v1, and these statistics
> are done in the blk-throttle code. But the current code only counts the
> bios that are actually throttled. When the user does not add the throttle
> limit, the io stats for cgroup v1 has nothing. I fix it according to the
> statistical method of v2, and made it count all ios accurately.
>
> Fixes: a7b36ee6ba29 ("block: move blk-throtl fast path inline")
> Tested-by: Andrea Righi <andrea.righi@canonical.com>
> Signed-off-by: Jinke Han <hanjinke.666@bytedance.com>
> ---
> block/blk-cgroup.c | 6 ++++--
> block/blk-throttle.c | 6 ------
> block/blk-throttle.h | 9 +++++++++
> 3 files changed, 13 insertions(+), 8 deletions(-)
>
> diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
> index 0ce64dd73cfe..5b29912a0ee2 100644
> --- a/block/blk-cgroup.c
> +++ b/block/blk-cgroup.c
> @@ -2048,6 +2048,9 @@ void blk_cgroup_bio_start(struct bio *bio)
> struct blkg_iostat_set *bis;
> unsigned long flags;
>
> + if (!cgroup_subsys_on_dfl(io_cgrp_subsys))
> + return;
> +
> /* Root-level stats are sourced from system-wide IO stats */
> if (!cgroup_parent(blkcg->css.cgroup))
> return;
> @@ -2079,8 +2082,7 @@ void blk_cgroup_bio_start(struct bio *bio)
> }
>
> u64_stats_update_end_irqrestore(&bis->sync, flags);
> - if (cgroup_subsys_on_dfl(io_cgrp_subsys))
> - cgroup_rstat_updated(blkcg->css.cgroup, cpu);
> + cgroup_rstat_updated(blkcg->css.cgroup, cpu);
> put_cpu();
> }
>
> diff --git a/block/blk-throttle.c b/block/blk-throttle.c
> index 9d010d867fbf..7397ff199d66 100644
> --- a/block/blk-throttle.c
> +++ b/block/blk-throttle.c
> @@ -2178,12 +2178,6 @@ bool __blk_throtl_bio(struct bio *bio)
>
> rcu_read_lock();
>
> - if (!cgroup_subsys_on_dfl(io_cgrp_subsys)) {
> - blkg_rwstat_add(&tg->stat_bytes, bio->bi_opf,
> - bio->bi_iter.bi_size);
> - blkg_rwstat_add(&tg->stat_ios, bio->bi_opf, 1);
> - }
> -
> spin_lock_irq(&q->queue_lock);
>
> throtl_update_latency_buckets(td);
> diff --git a/block/blk-throttle.h b/block/blk-throttle.h
> index ef4b7a4de987..d1ccbfe9f797 100644
> --- a/block/blk-throttle.h
> +++ b/block/blk-throttle.h
> @@ -185,6 +185,15 @@ static inline bool blk_should_throtl(struct bio *bio)
> struct throtl_grp *tg = blkg_to_tg(bio->bi_blkg);
> int rw = bio_data_dir(bio);
>
> + if (!cgroup_subsys_on_dfl(io_cgrp_subsys)) {
> + if (!bio_flagged(bio, BIO_CGROUP_ACCT)) {
> + bio_set_flag(bio, BIO_CGROUP_ACCT);
> + blkg_rwstat_add(&tg->stat_bytes, bio->bi_opf,
> + bio->bi_iter.bi_size);
> + }
> + blkg_rwstat_add(&tg->stat_ios, bio->bi_opf, 1);
> + }
> +
> /* iops limit is always counted */
> if (tg->has_rules_iops[rw])
> return true;

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