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blk-cgroup: use group allocation/free of per-cpu counters API

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Use group allocation/free of per-cpu counters api to accelerate
blkg_rwstat_init/exit() and simplify code.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Link: https://lore.kernel.org/r/20240325035955.50019-1-wangkefeng.wang@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kefeng Wang 2024-03-25 11:59:55 +08:00 committed by Jens Axboe
parent fa1af65bf8
commit 688c8b9208
1 changed files with 6 additions and 12 deletions
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18
block/blk-cgroup-rwstat.c
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@ -9,25 +9,19 @@ int blkg_rwstat_init(struct blkg_rwstat *rwstat, gfp_t gfp)
{
int i, ret;
for (i = 0; i < BLKG_RWSTAT_NR; i++) {
ret = percpu_counter_init(&rwstat->cpu_cnt[i], 0, gfp);
if (ret) {
while (--i >= 0)
percpu_counter_destroy(&rwstat->cpu_cnt[i]);
return ret;
}
ret = percpu_counter_init_many(rwstat->cpu_cnt, 0, gfp, BLKG_RWSTAT_NR);
if (ret)
return ret;
for (i = 0; i < BLKG_RWSTAT_NR; i++)
atomic64_set(&rwstat->aux_cnt[i], 0);
}
return 0;
}
EXPORT_SYMBOL_GPL(blkg_rwstat_init);
void blkg_rwstat_exit(struct blkg_rwstat *rwstat)
{
int i;
for (i = 0; i < BLKG_RWSTAT_NR; i++)
percpu_counter_destroy(&rwstat->cpu_cnt[i]);
percpu_counter_destroy_many(rwstat->cpu_cnt, BLKG_RWSTAT_NR);
}
EXPORT_SYMBOL_GPL(blkg_rwstat_exit);