From: Chengming Zhou Date: Sun, 13 Feb 2022 08:59:02 +0000 (+0800) Subject: blk-cgroup: set blkg iostat after percpu stat aggregation X-Git-Tag: v6.6.17~7806^2~65 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f122d103b564e5fb7c82de902c6f8f6cbdf50ec9;p=platform%2Fkernel%2Flinux-rpi.git blk-cgroup: set blkg iostat after percpu stat aggregation 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 Acked-by: Tejun Heo Link: https://lore.kernel.org/r/20220213085902.88884-1-zhouchengming@bytedance.com Signed-off-by: Jens Axboe --- diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 4108d44..fa063c6 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -856,11 +856,11 @@ static void blkcg_fill_root_iostats(void) blk_queue_root_blkg(bdev_get_queue(bdev)); 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] += @@ -876,11 +876,11 @@ 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); } }