Add wait_event_timing: Oracle-style wait event instrumentation#1

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DmitryNFomin wants to merge 37 commits intomasterfrom

wait-event-timing

Commits on Mar 22, 2026

Add wait_event_timing: Oracle-style wait event instrumentation

DmitryNFomin
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claude
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Commits on Mar 24, 2026

Make wait_event_timing a compile-time option (--enable-wait-event-timing)

DmitryNFomin
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claude
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Increase trace ring buffer from 4K to 128K records per backend

DmitryNFomin
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claude
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Commits on Apr 10, 2026

Fix: add missing tuplestore.h include for tuplestore_putvalues()

dmitry
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factory-droid[bot]
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Commits on Apr 13, 2026

Fix #1: Replace unconditional trace ring allocation with DSA lazy allocation

dmitry
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Fix #2: Add privilege checks to wait event timing SQL functions

dmitry
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Fix #3: Zero shared memory on backend exit to prevent stale data leaks

dmitry
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factory-droid[bot]
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Fix #4: Bump CATALOG_VERSION_NO for new pg_proc OIDs

dmitry
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factory-droid[bot]
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Commits on Apr 14, 2026

Fix #5: Add --enable-wait-event-timing to configure, use pattern 1

dmitry
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Fix #6: LWLock tranche IDs can exceed 256 -- per-backend hash table

dmitry
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factory-droid[bot]
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Fix #7: Trace ring buffer reader/writer race -- seqlock protocol

dmitry
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factory-droid[bot]
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Fix #8: Query hash entry publication order race

dmitry
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Fix #9: Clamp negative duration to zero

dmitry
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Fix #10: Warn when wait_event_trace enabled without wait_event_timing

dmitry
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Fix #11: Implement pg_stat_reset_wait_event_timing() SQL function

dmitry
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factory-droid[bot]
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Fix #12: Redesign query attribution -- eliminate hash table, use trace ring

dmitry
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factory-droid[bot]
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Fix #13: Return histogram as int4[] instead of text

dmitry
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Fix #15: Include auxiliary processes in wait event timing

dmitry
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Fix #16: Replace histogram bucket loop with hardware CLZ

dmitry
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Fix #17: Promote histogram bucket counters from int32 to int64

dmitry
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Fix #18: Replace bare extern GUC declarations with header include

dmitry
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Fix #20: Add GUC check hooks that reject 'on' in unsupported builds

dmitry
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Commits on Apr 15, 2026

Commits on Apr 16, 2026

Fix review round 2: 17 issues from consolidated review

dmitry
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Fix all compiler warnings in wait_event_timing.c

dmitry
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Fix parallel_schedule: move wait_event_timing to smaller test group

dmitry
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factory-droid[bot]
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Commits on Apr 17, 2026

Fix review round 3: 20 issues from triple AI cross-check

dmitry
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factory-droid[bot]
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Commits on Apr 18, 2026

Fix round 3 regressions: remove locks on single-writer paths, fix tests

dmitry
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factory-droid[bot]
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