Expose memory usage statistics to Rust via SnMalloc::memory_stats()#851
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jayakasadev wants to merge 2 commits into
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Expose memory usage statistics to Rust via SnMalloc::memory_stats()#851jayakasadev wants to merge 2 commits into
jayakasadev wants to merge 2 commits into
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Wire up the existing `sn_rust_statistics` C export (already present in rust.cc) to Rust. Adds an FFI binding in snmalloc-sys and a safe `SnMalloc::memory_stats()` associated function in snmalloc-rs that returns an `AllocStats` struct with current and peak OS-level memory reservation figures tracked by StatsRange. No C++ changes required — the backend counters are always active.
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Summary
AllocStats { current_memory_usage, peak_memory_usage }tosnmalloc-rsSnMalloc::memory_stats() -> AllocStatsassociated functionsn_rust_statisticsinsnmalloc-sysNo C++ changes were required —
sn_rust_statisticsalready existed inrust.ccandStatsRangecounters are always active regardless of thestatsbuild feature.The returned values are OS-level memory reservation figures at slab/chunk granularity (tracked atomically by
StatsRange), not the sum of individual live allocation sizes.Usage
Test plan
cargo test --package snmalloc-rs— 7/7 tests pass including newtest_memory_statstest_memory_statsallocates 1 MiB, verifies current/peak are non-decreasing after allocation, and that peak never decreases after free