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blk-cgroup: pass blkg_rwstat structures by reference

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Returning a structure generates rather bad code, so switch to passing
by reference.  Also don't require the structure to be zeroed and add
to the 0-initialized counters, but actually set the counters to the
calculated value.

Acked-by: Tejun Heo <tj@kernel.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 12:26:20 +02:00
committed by Jens Axboe
parent 239eeb0857
commit 5d0b6e48cb
3 changed files with 32 additions and 28 deletions
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14
include/linux/blk-cgroup.h
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@@ -224,8 +224,8 @@ int blkg_print_stat_ios_recursive(struct seq_file *sf, void *v);
u64 blkg_stat_recursive_sum(struct blkcg_gq *blkg,
struct blkcg_policy *pol, int off);
struct blkg_rwstat blkg_rwstat_recursive_sum(struct blkcg_gq *blkg,
struct blkcg_policy *pol, int off);
void blkg_rwstat_recursive_sum(struct blkcg_gq *blkg, struct blkcg_policy *pol,
int off, struct blkg_rwstat *sum);
struct blkg_conf_ctx {
struct gendisk *disk;
@@ -700,15 +700,14 @@ static inline void blkg_rwstat_add(struct blkg_rwstat *rwstat,
*
* Read the current snapshot of @rwstat and return it in the aux counts.
*/
static inline struct blkg_rwstat blkg_rwstat_read(struct blkg_rwstat *rwstat)
static inline void blkg_rwstat_read(struct blkg_rwstat *rwstat,
struct blkg_rwstat *result)
{
struct blkg_rwstat result;
int i;
for (i = 0; i < BLKG_RWSTAT_NR; i++)
atomic64_set(&result.aux_cnt[i],
atomic64_set(&result->aux_cnt[i],
percpu_counter_sum_positive(&rwstat->cpu_cnt[i]));
return result;
}
/**
@@ -721,8 +720,9 @@ static inline struct blkg_rwstat blkg_rwstat_read(struct blkg_rwstat *rwstat)
*/
static inline uint64_t blkg_rwstat_total(struct blkg_rwstat *rwstat)
{
struct blkg_rwstat tmp = blkg_rwstat_read(rwstat);
struct blkg_rwstat tmp = { };
blkg_rwstat_read(rwstat, &tmp);
return atomic64_read(&tmp.aux_cnt[BLKG_RWSTAT_READ]) +
atomic64_read(&tmp.aux_cnt[BLKG_RWSTAT_WRITE]);
}