[0ax1]

Problem

Repeated scans rebuild file mappings and page tables; caching them also needs explicit support for cold-cache eviction.

Solution

Cache mappings by file identity/version and add release_file_mappings() and vx_cuda_release_file_mappings().

Assessment

Callers can release cached mappings before eviction while active readers retain ownership. Depends on #10716.

[codspeed]

Merging this PR will degrade performance by 24.75%

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

⚠️ 16 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

See affected benchmarks

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

❌ 2 regressed benchmarks
✅ 2406 untouched benchmarks
⏩ 12 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	CPU Simulation	decode_primitives[i64, (1000, 8)]	24 µs	37.6 µs	-36.15%
❌	Walltime	bitpack_blocked_compress_avx2	6.7 µs	7.6 µs	-11.32%

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-file-mapping-cache (a149621) with ad/cuda-mapped-copy (5d8b5f3)}

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. ↩