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crimson/os/seastore: drop sub-ms do_transaction latency buckets

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The do_transaction latency histograms now source their samples from
seastar::lowres_clock (~0.5ms default). Drop the sub 1ms buckets.

Signed-off-by: Matan Breizman <mbreizma@redhat.com>
This commit is contained in:
Matan Breizman 2026-07-08 11:21:08 +00:00
parent 784598bd54
commit dd9cdd7293
1 changed files with 11 additions and 7 deletions
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18
src/crimson/os/seastore/seastore.h
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@ -440,10 +440,12 @@ public:
static constexpr auto LAT_MAX = static_cast<std::size_t>(op_type_t::MAX);
// Histogram bucket upper bounds in microseconds (0.25ms–20ms).
// Ops above 20ms land in the last bucket as overflow.
static constexpr std::array<double, 14> lat_hist_bounds_us = {
250, 500, 1000,
// Histogram bucket upper bounds in microseconds (1ms–100ms).
// Ops above 100ms land in the last bucket as overflow. The smallest
// bucket is 1ms: sub-ms latencies are below lowres_clock resolution
// (~task_quota) and cannot be resolved, so no finer buckets are kept.
static constexpr std::array<double, 12> lat_hist_bounds_us = {
1000,
1500, 2000, 3000,
5000,
7500, 10000,
@ -456,9 +458,11 @@ public:
static constexpr std::size_t REPLAY_BUCKETS = 16;
static constexpr auto STAGE_MAX = static_cast<std::size_t>(txn_stage_t::MAX);
// Upper bounds (microseconds) for the per-stage do_transaction latency histograms
static constexpr std::array<uint64_t, 14> STAGE_LAT_BUCKETS_US = {
250, 500, 1000, 1500, 2000, 3000, 5000, 7500,
// Upper bounds (microseconds) for the per-stage do_transaction latency
// histograms. Smallest bucket is 1ms; sub-ms is below lowres_clock
// resolution (~task_quota) and cannot be resolved.
static constexpr std::array<uint64_t, 12> STAGE_LAT_BUCKETS_US = {
1000, 1500, 2000, 3000, 5000, 7500,
10000, 15000, 20000, 30000, 50000, 100000
};