block: export I/O latency histograms#1026
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The existing block I/O statistics expose completed I/O counts and total elapsed time for each operation group. Userspace can derive average latency from those counters, but it cannot recover tail latency information such as P99 from cumulative totals. Add optional per-block-device latency histogram accounting for read, write, discard and flush statistics groups. The counters follow the existing I/O statistics accounting paths and are exported through /proc/disk_lat_hists. Add /proc/disk_lat_buckets to expose the bucket upper bounds in microseconds so userspace can interpret each histogram counter. Histogram storage is allocated per block_device and treated as optional. If allocation fails, regular I/O statistics continue to work and the histogram output skips that device. Signed-off-by: Diangang Li <lidiangang@bytedance.com>
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Pull request for series with
subject: block: export I/O latency histograms
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1120508