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blkcg: make blkg_[rw]stat_recursive_sum() to be able to index into blkcg_gq

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Currently, blkg_[rw]stat_recursive_sum() assume that the target
counter is located in pd (blkg_policy_data); however, some counters
are planned to be moved to blkg (blkcg_gq).

This patch updates blkg_[rw]stat_recursive_sum() to take blkg and
blkg_policy pointers instead of pd.  If policy is NULL, it indexes
into blkg.  If non-NULL, into the blkg's pd of the policy.

The existing usages are updated to maintain the current behaviors.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo
2015-08-18 14:55:23 -07:00
committed by Jens Axboe
parent 24bdb8ef06
commit f12c74cab1
3 changed files with 50 additions and 34 deletions
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8
block/cfq-iosched.c
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@@ -1886,16 +1886,16 @@ static int cfqg_print_rwstat(struct seq_file *sf, void *v)
static u64 cfqg_prfill_stat_recursive(struct seq_file *sf,
struct blkg_policy_data *pd, int off)
{
u64 sum = blkg_stat_recursive_sum(pd, off);
u64 sum = blkg_stat_recursive_sum(pd_to_blkg(pd),
&blkcg_policy_cfq, off);
return __blkg_prfill_u64(sf, pd, sum);
}
static u64 cfqg_prfill_rwstat_recursive(struct seq_file *sf,
struct blkg_policy_data *pd, int off)
{
struct blkg_rwstat sum = blkg_rwstat_recursive_sum(pd, off);
struct blkg_rwstat sum = blkg_rwstat_recursive_sum(pd_to_blkg(pd),
&blkcg_policy_cfq, off);
return __blkg_prfill_rwstat(sf, pd, &sum);
}