block: export windowed IO P99 latency #462
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Track per-IO completion latency in a power-of-two histogram (NR_STAT_BUCKETS buckets, DISK_LAT_BASE_USEC .. DISK_LAT_MAX_USEC). Maintain a per-cpu sliced ring histogram and compute P99 by aggregating the recent slices at read time in /proc/diskstats and /sys/block/<dev>/stat. Report P99 in usecs using the bucket midpoint, clamp overflows to DISK_LAT_MAX_USEC, and append the P99 for read/write/discard/flush. Suggested-by: Fengnan Chang <changfengnan@bytedance.com> Signed-off-by: Diangang Li <lidiangang@bytedance.com>
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Pull request for series with
subject: block: export windowed IO P99 latency
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1040324