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blk-cgroup: set blkg iostat after percpu stat aggregation

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[ Upstream commit f122d103b564e5fb7c82de902c6f8f6cbdf50ec9 ]

Don't need to do blkg_iostat_set for top blkg iostat on each CPU,
so move it after percpu stat aggregation.

Fixes: ef45fe470e1e ("blk-cgroup: show global disk stats in root cgroup io.stat")
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220213085902.88884-1-zhouchengming@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chengming Zhou 2022-02-13 16:59:02 +08:00 committed by Greg Kroah-Hartman
parent c17eb1586c
commit e129fb0651
1 changed files with 5 additions and 5 deletions
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10
block/blk-cgroup.c
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@ -855,11 +855,11 @@ static void blkcg_fill_root_iostats(void)
blk_queue_root_blkg(bdev->bd_disk->queue);
struct blkg_iostat tmp;
int cpu;
unsigned long flags;
memset(&tmp, 0, sizeof(tmp));
for_each_possible_cpu(cpu) {
struct disk_stats *cpu_dkstats;
unsigned long flags;
cpu_dkstats = per_cpu_ptr(bdev->bd_stats, cpu);
tmp.ios[BLKG_IOSTAT_READ] +=
@ -875,11 +875,11 @@ static void blkcg_fill_root_iostats(void)
cpu_dkstats->sectors[STAT_WRITE] << 9;
tmp.bytes[BLKG_IOSTAT_DISCARD] +=
cpu_dkstats->sectors[STAT_DISCARD] << 9;
flags = u64_stats_update_begin_irqsave(&blkg->iostat.sync);
blkg_iostat_set(&blkg->iostat.cur, &tmp);
u64_stats_update_end_irqrestore(&blkg->iostat.sync, flags);
}
flags = u64_stats_update_begin_irqsave(&blkg->iostat.sync);
blkg_iostat_set(&blkg->iostat.cur, &tmp);
u64_stats_update_end_irqrestore(&blkg->iostat.sync, flags);
}
}