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blk-stat: export helpers for modifying blk_rq_stat 

We need to use blk_rq_stat in the blkcg qos stuff, so export some of
these helpers so they can be used by other things.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Josef Bacik 2018-07-03 11:14:57 -04:00 committed by Jens Axboe
parent 2cf855837b
commit 2ecbf45635
2 changed files with 12 additions and 8 deletions
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16
block/blk-stat.c
View File

@ -17,7 +17,7 @@ struct blk_queue_stats {
bool enable_accounting;
};
static void blk_stat_init(struct blk_rq_stat *stat)
void blk_rq_stat_init(struct blk_rq_stat *stat)
{
stat->min = -1ULL;
stat->max = stat->nr_samples = stat->mean = 0;
@ -25,7 +25,7 @@ static void blk_stat_init(struct blk_rq_stat *stat)
}
/* src is a per-cpu stat, mean isn't initialized */
static void blk_stat_sum(struct blk_rq_stat *dst, struct blk_rq_stat *src)
void blk_rq_stat_sum(struct blk_rq_stat *dst, struct blk_rq_stat *src)
{
if (!src->nr_samples)
return;
@ -39,7 +39,7 @@ static void blk_stat_sum(struct blk_rq_stat *dst, struct blk_rq_stat *src)
dst->nr_samples += src->nr_samples;
}
static void __blk_stat_add(struct blk_rq_stat *stat, u64 value)
void blk_rq_stat_add(struct blk_rq_stat *stat, u64 value)
{
stat->min = min(stat->min, value);
stat->max = max(stat->max, value);
@ -69,7 +69,7 @@ void blk_stat_add(struct request *rq, u64 now)
continue;
stat = &get_cpu_ptr(cb->cpu_stat)[bucket];
__blk_stat_add(stat, value);
blk_rq_stat_add(stat, value);
put_cpu_ptr(cb->cpu_stat);
}
rcu_read_unlock();
@ -82,15 +82,15 @@ static void blk_stat_timer_fn(struct timer_list *t)
int cpu;
for (bucket = 0; bucket < cb->buckets; bucket++)
blk_stat_init(&cb->stat[bucket]);
blk_rq_stat_init(&cb->stat[bucket]);
for_each_online_cpu(cpu) {
struct blk_rq_stat *cpu_stat;
cpu_stat = per_cpu_ptr(cb->cpu_stat, cpu);
for (bucket = 0; bucket < cb->buckets; bucket++) {
blk_stat_sum(&cb->stat[bucket], &cpu_stat[bucket]);
blk_stat_init(&cpu_stat[bucket]);
blk_rq_stat_sum(&cb->stat[bucket], &cpu_stat[bucket]);
blk_rq_stat_init(&cpu_stat[bucket]);
}
}
@ -143,7 +143,7 @@ void blk_stat_add_callback(struct request_queue *q,
cpu_stat = per_cpu_ptr(cb->cpu_stat, cpu);
for (bucket = 0; bucket < cb->buckets; bucket++)
blk_stat_init(&cpu_stat[bucket]);
blk_rq_stat_init(&cpu_stat[bucket]);
}
spin_lock(&q->stats->lock);

4
block/blk-stat.h
View File

@ -159,4 +159,8 @@ static inline void blk_stat_activate_msecs(struct blk_stat_callback *cb,
mod_timer(&cb->timer, jiffies + msecs_to_jiffies(msecs));
}
void blk_rq_stat_add(struct blk_rq_stat *, u64);
void blk_rq_stat_sum(struct blk_rq_stat *, struct blk_rq_stat *);
void blk_rq_stat_init(struct blk_rq_stat *);
#endif