[0ax1]

Problem

Pinned-buffer reclamation allocates an extra completion event for each transfer.

Solution

Reuse the buffer owner's event to track inflight transfers.

Assessment

Preserves the source-retention guarantees and event flags from #10712, which must merge first.

[codspeed]

Merging this PR will regress 1 benchmark

2 warnings, 1 note

⚠️ Walltime results may be unreliable

Some benchmarks used the Walltime instrument outside CodSpeed Macro Runners, which can make the results inconsistent.

Learn more about Macro Runners

See affected benchmarks

⚠️ 21 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

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ℹ️ 40 benchmarks have no flamegraph

The flamegraph wasn't generated: the symbols of the profiling trace could not be resolved, because no information about the language frames was collected.

See affected benchmarks

⚡ 8 improved benchmarks
❌ 1 regressed benchmark
✅ 2399 untouched benchmarks
⏩ 12 skipped benchmarks¹
🗄️ 43 archived benchmarks run²

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Walltime	bitpack_blocked_compress_avx2	6.7 µs	7.6 µs	-11.31%
⚡	Walltime	filter_neon[8]	1,997 ns	916 ns	×2.2
⚡	Walltime	threshold_neon[8]	2.6 µs	1.3 µs	+98.46%
⚡	Walltime	threshold_neon[64]	3.5 µs	2.5 µs	+39.8%
⚡	Walltime	filter_neon[64]	2.5 µs	1.8 µs	+38.41%
⚡	Walltime	threshold_neon[80]	4.6 µs	3.4 µs	+36.84%
⚡	Walltime	filter_neon[80]	3.4 µs	2.6 µs	+31.46%
⚡	Walltime	decode_chunked_neon[i64, 524288]	15.7 µs	13.3 µs	+18.09%
⚡	CPU Simulation	test_scan_filter[int]	3.4 ms	3 ms	+12.7%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing ad/cuda-pinned-event-reuse (8acd798) with develop (c750fbd)}

Footnotes

1. 12 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. 43 benchmarks were run, but are now archived. If they were deleted in another branch, consider rebasing to remove them from the report. Instead if they were added back, click here to restore them. ↩