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bfq-iosched: move bfq_stat_recursive_sum into the only caller

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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: Tejun Heo <tj@kernel.org>
Acked-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2019-06-06 12:26:23 +02:00 committed by Jens Axboe
parent c0ce79dca5
commit d6258980da
1 changed files with 19 additions and 43 deletions
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62
block/bfq-cgroup.c
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@ -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);
}