perf(backfill): cut allocations on backfill state hot paths#70
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seanjnkns wants to merge 1 commit into
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perf(backfill): cut allocations on backfill state hot paths#70seanjnkns wants to merge 1 commit into
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Maintain incremental pgCounts instead of rescanning all PGs on each pgCountsByOsd call. Reuse caller buffers in computeBackfillSrcsTgts, inline the target OSD check in hasRoomForRemap, and pre-populate osd entries when building backfill state. Benchmarks (large fixtures, benchstat vs scaffold baseline): HasRoomForRemap ~39% faster, 10→4 allocs/op AddReservations ~56% faster, ~45k→2k allocs/op RemoveReservations ~40% faster, ~44k→0 allocs/op ComputeBackfillSrcsTgts ~92% faster, 2→0 allocs/op
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Maintain incremental pgCounts instead of rescanning all PGs on each pgCountsByOsd call. Reuse caller buffers in computeBackfillSrcsTgts, inline the target OSD check in hasRoomForRemap, and pre-populate osd entries when building backfill state.
Benchmarks (large fixtures, benchstat vs scaffold baseline):
HasRoomForRemap ~39% faster, 10→4 allocs/op
AddReservations ~56% faster, ~45k→2k allocs/op
RemoveReservations ~40% faster, ~44k→0 allocs/op
ComputeBackfillSrcsTgts ~92% faster, 2→0 allocs/op