From: Paolo Valente <paolo.valente@linaro.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, cgroups@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/6] bfq-iosched: move bfq_stat_recursive_sum into the only caller
Date: Fri, 7 Jun 2019 08:07:48 +0200 [thread overview]
Message-ID: <3F21E6DF-2688-46A8-8A41-320BCBA86D05@linaro.org> (raw)
In-Reply-To: <20190606102624.3847-6-hch@lst.de>
[-- Attachment #1: Type: text/plain, Size: 3020 bytes --]
> Il giorno 6 giu 2019, alle ore 12:26, Christoph Hellwig <hch@lst.de> ha scritto:
>
> This function was moved from core block code and is way to generic.
> Fold it into the only caller and simplify it based on the actually
> passed arguments.
>
Acked-by: Paolo Valente <paolo.valente@linaro.org>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> block/bfq-cgroup.c | 62 ++++++++++++++--------------------------------
> 1 file changed, 19 insertions(+), 43 deletions(-)
>
> diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
> index a691dca7e966..d84302445e30 100644
> --- a/block/bfq-cgroup.c
> +++ b/block/bfq-cgroup.c
> @@ -80,47 +80,6 @@ static inline void bfq_stat_add_aux(struct bfq_stat *to,
> &to->aux_cnt);
> }
>
> -/**
> - * bfq_stat_recursive_sum - collect hierarchical bfq_stat
> - * @blkg: blkg of interest
> - * @pol: blkcg_policy which contains the bfq_stat
> - * @off: offset to the bfq_stat in blkg_policy_data or @blkg
> - *
> - * Collect the bfq_stat specified by @blkg, @pol and @off and all its
> - * online descendants and their aux counts. The caller must be holding the
> - * queue lock for online tests.
> - *
> - * If @pol is NULL, bfq_stat is at @off bytes into @blkg; otherwise, it is
> - * at @off bytes into @blkg's blkg_policy_data of the policy.
> - */
> -static u64 bfq_stat_recursive_sum(struct blkcg_gq *blkg,
> - struct blkcg_policy *pol, int off)
> -{
> - struct blkcg_gq *pos_blkg;
> - struct cgroup_subsys_state *pos_css;
> - u64 sum = 0;
> -
> - lockdep_assert_held(&blkg->q->queue_lock);
> -
> - rcu_read_lock();
> - blkg_for_each_descendant_pre(pos_blkg, pos_css, blkg) {
> - struct bfq_stat *stat;
> -
> - if (!pos_blkg->online)
> - continue;
> -
> - if (pol)
> - stat = (void *)blkg_to_pd(pos_blkg, pol) + off;
> - else
> - stat = (void *)blkg + off;
> -
> - sum += bfq_stat_read(stat) + atomic64_read(&stat->aux_cnt);
> - }
> - rcu_read_unlock();
> -
> - return sum;
> -}
> -
> /**
> * blkg_prfill_stat - prfill callback for bfq_stat
> * @sf: seq_file to print to
> @@ -1045,8 +1004,25 @@ static int bfqg_print_rwstat(struct seq_file *sf, void *v)
> static u64 bfqg_prfill_stat_recursive(struct seq_file *sf,
> struct blkg_policy_data *pd, int off)
> {
> - u64 sum = bfq_stat_recursive_sum(pd_to_blkg(pd),
> - &blkcg_policy_bfq, off);
> + struct blkcg_gq *blkg = pd_to_blkg(pd);
> + struct blkcg_gq *pos_blkg;
> + struct cgroup_subsys_state *pos_css;
> + u64 sum = 0;
> +
> + lockdep_assert_held(&blkg->q->queue_lock);
> +
> + rcu_read_lock();
> + blkg_for_each_descendant_pre(pos_blkg, pos_css, blkg) {
> + struct bfq_stat *stat;
> +
> + if (!pos_blkg->online)
> + continue;
> +
> + stat = (void *)blkg_to_pd(pos_blkg, &blkcg_policy_bfq) + off;
> + sum += bfq_stat_read(stat) + atomic64_read(&stat->aux_cnt);
> + }
> + rcu_read_unlock();
> +
> return __blkg_prfill_u64(sf, pd, sum);
> }
>
> --
> 2.20.1
>
[-- Attachment #2: Message signed with OpenPGP --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
next prev parent reply other threads:[~2019-06-07 6:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 10:26 blk-cgroup cleanups Christoph Hellwig
2019-06-06 10:26 ` [PATCH 1/6] blk-cgroup: factor out a helper to read rwstat counter Christoph Hellwig
2019-06-06 15:03 ` Chaitanya Kulkarni
2019-06-06 10:26 ` [PATCH 2/6] blk-cgroup: pass blkg_rwstat structures by reference Christoph Hellwig
2019-06-06 10:26 ` [PATCH 3/6] blk-cgroup: introduce a new struct blkg_rwstat_sample Christoph Hellwig
2019-06-06 10:26 ` [PATCH 4/6] blk-cgroup: move struct blkg_stat to bfq Christoph Hellwig
2019-06-07 6:07 ` Paolo Valente
2019-06-06 10:26 ` [PATCH 5/6] bfq-iosched: move bfq_stat_recursive_sum into the only caller Christoph Hellwig
2019-06-07 6:07 ` Paolo Valente [this message]
2019-06-06 10:26 ` [PATCH 6/6] block: rename CONFIG_DEBUG_BLK_CGROUP to CONFIG_BFQ_CGROUP_DEBUG Christoph Hellwig
2019-06-07 6:07 ` Paolo Valente
2019-06-10 18:23 ` blk-cgroup cleanups Tejun Heo
2019-06-20 9:42 ` Christoph Hellwig
2019-06-20 16:32 ` Jens Axboe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3F21E6DF-2688-46A8-8A41-320BCBA86D05@linaro.org \
--to=paolo.valente@linaro.org \
--cc=axboe@kernel.dk \
--cc=cgroups@vger.kernel.org \
--cc=hch@lst.de \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).