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Thu, 29 Oct 2026 09:30:07 -0700 (PDT) Date: Thu, 29 Oct 2026 09:29:55 -0700 X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Mime-Version: 1.0 X-Mailer: git-send-email 2.56.0.317.g454f8302e1-goog Message-ID: <20261029162958.3224280-1-irogers@google.com> Subject: [RFC PATCH v1 0/3] tools: Add Rust library build infrastructure and prefer zlib-rs From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Ian Rogers , Quentin Monnet , Miguel Ojeda , Nathan Chancellor , Nicolas Schier , Nick Desaulniers , Bill Wendling , Justin Stitt Cc: linux-perf-users@vger.kernel.org, bpf@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kbuild@vger.kernel.org, llvm@lists.linux.dev, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" The zlib-rs project (https://github.com/trifectatechfoundation/zlib-rs) provides a memory-safe, high-performance Rust implementation of the zlib compression specification along with a C ABI layer (libz-rs-sys) that is a drop-in replacement for the standard C zlib library. On many Linux distributions (such as Debian and Ubuntu), Rust crates like zlib-rs and libz-rs-sys are packaged as Cargo registry sources under /usr/share/cargo/registry/ (e.g. librust-libz-rs-sys-dev) rather than as prebuilt C shared libraries, while other environments may install prebuilt libz_rs libraries via pkg-config or a custom prefix (LIBZ_RS_DIR). This RFC series lays the groundwork for building and linking Rust crate libraries in tools/ (without requiring network access or invoking cargo) and integrates zlib-rs support into perf and bpftool, preferring zlib-rs over C zlib when available: 1. **tools build: Add Rust library build infrastructure and zlib-rs feature test**: - Adds `tools/build/Makefile.rust` with helpers to locate Cargo crate sources in distro (`/usr/share/cargo/registry`) or local Cargo registries (`CARGO_HOME` / `~/.cargo`), map `.rlib` prerequisites to explicit `--extern =` flags, and compile `.rlib` and `.a` targets directly with `rustc`. - Resolves `zlib-rs` compiler and linker flags via `LIBZ_RS_DIR`, `pkg-config` (`libz-rs-sys-cdylib`, `zlib-rs`, `z_rs`), or compiling `liblibc.rlib`, `libzlib_rs.rlib`, and `libz_rs.a` (with the `export-symbols`, `c-allocator`, `std`, and `gz` features) into `$(OUTPUT)libz_rs/`. - Adds `tools/build/feature/test-zlib-rs.c` checking `ZLIB_VER_SUBREVISION == 15` (`0xf`, which distinguishes `libz-rs-sys`'s `zlib.h` from standard C `zlib.h`) and linking against `inflateInit()`. - Extends `tools/build/Build.include`, `tools/build/Makefile.build`, `tools/scripts/Makefile.arch`, and `tools/scripts/Makefile.include` with reusable Rust build rules, cross-compilation target triples (`RUST_TARGET_FLAGS_`), and the `feature_rust_lib` macro. 2. **perf build: Prefer zlib-rs over zlib when available**: - Moves Rust detection ahead of zlib detection in `tools/perf/Makefile.config` and prefers `zlib-rs` over C `zlib` unless `NO_ZLIB_RS=1` (or `NO_ZLIB=1` / `NO_RUST=1`) is set. - Defines both `HAVE_ZLIB_SUPPORT` and `HAVE_ZLIB_RS_SUPPORT` when `zlib-rs` is used so existing zlib call sites in `perf` work unchanged while `perf version --build-options` and `perf check feature zlib-rs` report whether `zlib-rs` is active. - Shares `$(OUTPUT)libz_rs/` with the host bootstrap `bpftool` build in `tools/perf/bpf_skel.mak` and adds `NO_ZLIB` / `NO_ZLIB_RS` tests to `tools/perf/tests/make`. 3. **bpftool: Prefer zlib-rs over zlib when available**: - Adds `zlib-rs` and `zlib` to `FEATURE_TESTS` and `FEATURE_DISPLAY` in `tools/bpf/bpftool/Makefile` and configures `ZLIB_CFLAGS` and `ZLIB_LIBS` via `feature_rust_lib` when `zlib-rs` is detected. AI Assistance Disclosure (per Documentation/process/coding-assistants.rst and Documentation/process/generated-content.rst): - Tools used: Antigravity coding assistant and Sashiko automated patch review using Gemini 4 LLMs. - Summary of prompts and assistance: Interactive pair-programming session to identify distro packaging for zlib-rs/libz-rs-sys, implement the zlib-rs feature test and Makefile.rust crate build rules, integrate zlib-rs detection into perf and bpftool, separate Rust library outputs into $(OUTPUT)libz_rs/, and address automated review feedback on crate version sorting, cross-compilation flags, and libbpf EXTRA_CFLAGS handling. - Testing performed: Built and tested perf and bpftool with zlib-rs (default), NO_ZLIB_RS=1 (fallback to C zlib), NO_ZLIB=1, and MINIMAL=1; verified `perf version --build-options`, `perf check feature`, and the `make_no_zlib` / `make_no_zlib_rs` tests in `tools/perf/tests/make`; and checked all commits with `scripts/checkpatch.pl`. Assisted-by: Antigravity:gemini-4 Ian Rogers (3): tools build: Add Rust library build infrastructure and zlib-rs feature test perf build: Prefer zlib-rs over zlib when available bpftool: Prefer zlib-rs over zlib when available tools/bpf/bpftool/.gitignore | 1 + tools/bpf/bpftool/Makefile | 56 ++++++++- tools/build/Build.include | 14 ++- tools/build/Makefile.build | 13 +- tools/build/Makefile.feature | 9 +- tools/build/Makefile.rust | 149 +++++++++++++++++++++++ tools/build/feature/.gitignore | 1 + tools/build/feature/Makefile | 9 +- tools/build/feature/test-zlib-rs.c | 19 +++ tools/perf/.gitignore | 1 + tools/perf/Documentation/perf-check.txt | 1 + tools/perf/Makefile.config | 89 ++++++++------ tools/perf/Makefile.perf | 32 ++++- tools/perf/bpf_skel.mak | 8 +- tools/perf/builtin-check.c | 1 + tools/perf/scripts/install-build-deps.sh | 6 + tools/perf/tests/make | 9 ++ tools/scripts/Makefile.arch | 14 +++ tools/scripts/Makefile.include | 10 ++ 19 files changed, 385 insertions(+), 57 deletions(-) create mode 100644 tools/build/Makefile.rust create mode 100644 tools/build/feature/test-zlib-rs.c -- 2.56.0.313.g2479322e68-goog