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| author |   Christoph Hellwig <hch@lst.de> | 2019-06-06 12:26:20 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2019-06-20 10:32:34 -0600 |
| commit | 5d0b6e48cbef3219c0ed75e0e746c4ed259303c2 (patch) | |
| tree | 44575646c0c302eb4ce682d3b554a558fe6d5679 /include/linux/blk-cgroup.h | |
| parent | blk-cgroup: factor out a helper to read rwstat counter (diff) | |
| download | wireguard-linux-5d0b6e48cbef3219c0ed75e0e746c4ed259303c2.tar.xz wireguard-linux-5d0b6e48cbef3219c0ed75e0e746c4ed259303c2.zip | |
blk-cgroup: pass blkg_rwstat structures by reference
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>
Diffstat (limited to 'include/linux/blk-cgroup.h')
| -rw-r--r-- | include/linux/blk-cgroup.h | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h index 06236f56a840..3ee858111274 100644 --- a/include/linux/blk-cgroup.h +++ b/include/linux/blk-cgroup.h @@ -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]); } |