fix(datadog-agent-commons): add AIX platform settings - #2034
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Add AIX defaults for Datadog Agent configuration, log, and syslog paths so datadog-agent-commons can compile on AIX. Cover the AIX paths with a platform-specific unit test.
This was referenced Jul 6, 2026
Binary Size Analysis (Agent Data Plane)Baseline: f546aa0 · Comparison: 9421f83 · diff ✅ Binary size difference within thresholdChanges by Module
Detailed Symbol Changes |
Regression Detector (Agent Data Plane)Run ID: Optimization Goals: ✅ No significant changes detectedFine details of change detection per experiment (5)Experiments configured
Bounds Checks: ✅ Passed (5)
ExplanationA change is flagged as a regression when |Δ mean %| > 5.00% in the regressing direction for its optimization goal AND SMP marks the experiment as a regression ( |
…dog-agent-commons-aix
AIX uses the same default Agent paths and local syslog URI as Linux. Reuse the Linux platform implementation for both operating systems instead of carrying a duplicate AIX module.
AIX now uses the Linux platform implementation directly, so the separate AIX-only assertion duplicated the Linux defaults without adding useful coverage.
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## Summary Adds big-endian support to `stringtheory::MetaString` while keeping the existing optimized three-word union representation. This is one of the Saluki-side blockers from DADP-142 / the AIX Confluence notes. After getting past `process-memory`, the AIX ADP build stopped at `stringtheory` because the previous `MetaString` implementation explicitly required 64-bit little-endian platforms. ## Key changes - Keep `MetaString` on the existing compact three-word representation for both little- and big-endian 64-bit targets. - Make the discriminant/tag byte endian-aware: - little-endian uses byte `23`, preserving the existing layout and 23-byte inline capacity. - big-endian uses byte `16`, the high byte of the third machine word, with a 16-byte inline capacity so inline string bytes remain contiguous. - Preserve owned/static/interned/shared tagging through the high byte of the third `usize` across endianness. - Remove the separate big-endian fallback implementation in favor of the unified layout in `lib/stringtheory/src/lib.rs`. - Add tests for endian-specific layout constants, discriminant byte values, inline capacity boundaries, contiguous inline storage, and the public big-endian API surface. ## Design notes - The optimized `MetaString` layout stores all variants in three machine words and determines the active variant from a single tag byte. - On little-endian targets, that tag byte is the final byte of the 24-byte layout. On big-endian targets, the high byte of the third `usize` is instead the first byte of the third machine word, so the tag byte index must change. - Big-endian inline capacity is intentionally reduced from 23 bytes to 16 bytes. This keeps inline string contents as a contiguous prefix, so `Deref<Target = str>` can still return a borrowed `&str` without allocating. - Owned strings remain non-cheap to clone on both endiannesses because `From<String>` now uses the same owned-string variant everywhere. ## Continuation context This PR is part of a three-PR Saluki-side AIX enablement stack: 1. #2031: `process-memory` AIX RSS support. 2. This PR: `stringtheory` big-endian `MetaString` support. 3. #2034: `datadog-agent-commons` AIX platform settings. A separate upstream/fork fix is still needed for `aws-lc-rs`; during validation I used the local checkout of Travis's fork/branch on the AIX host. That temporary override is **not** included in this PR. Temporary AIX validation setup used on `soaix499`: ```sh export PATH=/opt/freeware/lib/RustSDK/1.92/bin:/opt/freeware/bin:/usr/sbin:/usr/bin:/bin export CC=/opt/freeware/bin/gcc-8 export CXX=/opt/freeware/bin/g++-8 export AR=/usr/bin/ar export RANLIB=/usr/bin/ranlib export CARGO_HOME=$HOME/dd/cargo-home export CARGO_TARGET_DIR=$HOME/dd/saluki-target export CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse ``` ## Test plan - RED on AIX before implementation: - Added temporary big-endian coverage while developing the initial fix. - `cargo test -p stringtheory --test big_endian --no-run` failed at the existing little-endian compile gate. - The final PR folds that coverage into the normal crate unit tests and removes the temporary integration test. - Local/native little-endian: - `make fmt` - `cargo nextest run -p stringtheory` - Focused inline-boundary tests for the tag-byte off-by-one case: - `cargo test -p stringtheory inlined_string_uses_every_byte_before_tag_byte -- --exact` - `cargo test -p stringtheory inlined_string_rejects_one_byte_past_tag_byte -- --exact` - `cargo check --workspace` - `cargo check --workspace --tests` - `make check-deny` - `git diff --check` - Big-endian compile target: - `rustup target add s390x-unknown-linux-gnu` - `cargo check -p stringtheory --target s390x-unknown-linux-gnu` - `cargo check -p stringtheory --tests --target s390x-unknown-linux-gnu` - AIX 7.3 (`soaix499`) on latest PR head `90a2aa6560` archived to `~/dd/saluki-pr2032-latest`: - `cargo test -p stringtheory --lib --ignore-rust-version` - Result: `45 passed; 0 failed`, including the endian-specific layout and public API unit tests. - AIX 7.3 (`soaix499`) with temporary local `aws-lc-rs` patch and the process-memory fix synced: - `cargo build -p agent-data-plane` got past `stringtheory` and failed at the next known blocker, AIX platform constants in `datadog-agent-commons`. ## Notes - This PR does not include the temporary local `aws-lc-rs` patch used for AIX validation. - The current branch commits were created with normal pre-commit checks enabled. Earlier notes about bypassing local hooks are obsolete after the rebase and follow-up commits. Co-authored-by: travis.thieman <travis.thieman@datadoghq.com>
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## Summary Adds AIX support to the `process-memory` crate by reading `/proc/<pid>/psinfo` and extracting the resident set size from the AIX `psinfo_t` layout. This is one of the Saluki-side blockers from DADP-142 / the AIX Confluence notes. With only the temporary `aws-lc-rs` AIX branch applied, the AIX ADP build previously stopped at `process-memory` because the crate rejected all non-Linux/macOS/Windows targets. ## Key changes - Add an AIX `Querier` backend for resident set size queries. - Include AIX in the crate's supported target list. - Parse `psinfo_t.pr_rssize` as a native-endian `uint64_t` value in KiB units, then convert to bytes with overflow checks. - Add AIX parser coverage for successful parsing, zero RSS, truncated `psinfo`, and overflow. - Add AIX-only integration coverage that compares `Querier` against the raw `/proc/<pid>/psinfo` RSS field. - Keep the `dhat` allocation test active on non-AIX targets and make the harness-free test binary a no-op on AIX, where `dhat` is intentionally not enabled. ## AIX implementation notes - AIX on `soaix499` does not expose `/proc/self/psinfo`; it exposes `/proc/<pid>/psinfo`. - IBM's AIX `/proc` documentation states that `/proc` files provide 64-bit mode-invariant data to observers and that future structure growth appends fields. - IBM documents `psinfo_t.pr_rssize` as `uint64_t pr_rssize`, resident set size in KiB (1024) units. - I verified the AIX 7.3 `psinfo_t` layout on `soaix499` with a small C program using `<sys/procfs.h>`: - `sizeof(psinfo_t) = 448` - `offsetof(psinfo_t, pr_size) = 96` - `offsetof(psinfo_t, pr_rssize) = 104` - `offsetof(psinfo_t, pr_start) = 112` - Manual magnitude validation on `soaix499` showed `Querier`, raw `pr_rssize * 1024`, and `ps v <pid>` report the same RSS magnitude. Treating `pr_rssize` as pages would report roughly 4x too high on the 4 KiB page-size test host. - The implementation is fail-closed: open/read/truncation/overflow failures return `None` rather than panicking. ## Continuation context This PR is part of a three-PR Saluki-side AIX enablement stack: 1. This PR: `process-memory` AIX RSS support. 2. #2032: `stringtheory` big-endian `MetaString` fallback. 3. #2034: `datadog-agent-commons` AIX platform settings. A separate upstream/fork fix is still needed for `aws-lc-rs`; during validation I used the local checkout of Travis's fork/branch on the AIX host. That temporary override is **not** included in this PR. ## Test plan Local: - `make fmt` - `cargo check -p process-memory` - `cargo check -p process-memory --tests` - `cargo test -p process-memory` - Direct parser test compile/run for `lib/process-memory/src/aix.rs`. AIX 7.3 (`soaix499`): - `cargo test -p process-memory` - Result: - AIX unit tests: `4 passed` - AIX integration tests: `1 passed` - `tests/no_runtime_allocations.rs` runs successfully as a no-op on AIX - Doc tests: `0 failed` - Manual RSS magnitude check: - `Querier` and raw `pr_rssize * 1024` reported about `5.9-6.1 MiB` for the test process. - `ps v <pid>` reported the same RSS magnitude. - Treating `pr_rssize` as a page count would have reported about `23.7-24.4 MiB`. ## Notes - This PR does not include the temporary local `aws-lc-rs` patch used for broader AIX validation. - The latest commits were made with the normal pre-commit hook path; the hook completed successfully, including formatting, clippy, license/advisory checks, prose checks, and API docs build. Co-authored-by: toby.lawrence <toby.lawrence@datadoghq.com>
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## Human Summary Adds a script and Makefile target to build a release ADP binary on AIX. This comes with two intentional divergences from how we build on the other platforms: - We can't use `cargo auditable` because it does not support XCOFF. Clanker tried to get it to work with some manual patching but wasn't able to. Seems like this will be a more significant contribution to upstream if we want this to work. - We can't use link-time optimization (LTO) because it doesn't seem to work on AIX at all, even for a hello-world crate. This is actually called out in IBM's docs [here](https://www.ibm.com/docs/en/osfroa/1.90.0?topic=started-introducing-rustc-compiler). Neither of these should be showstoppers, but please comment if they are. The plan will be to call this script from within the Agent's `packaging/aix` machinery when we do AIX builds. Working on that follow-up now. ## Summary - Adds `make build-adp-aix` for native AIX ADP builds using the IBM Rust SDK and AIX Toolbox GCC toolchain. - Adds `ci/tooling/build-adp-aix.sh` to record the AIX build environment and run the native Cargo build. - Adds an `aix-optimized-release` Cargo profile that keeps the optimized-release binary settings that work on AIX while disabling LTO. - Checks the major toolchain versions for cargo/rustc/gcc/g++ so AIX builds fail loudly if the toolchain drifts unexpectedly. ## Notes - The AIX enablement and AWS-LC dependency changes from #2031, #2032, #2034, #2060, and #2082 are now on `main`; this PR is rebased on top of them and only carries the build helper/profile changes. - `aws-lc-sys` is built from the bumped dependency without patching Cargo's registry cache. - On the AIX test host, `gcc-8` fails in an AWS-LC compiler feature probe; `/opt/freeware/bin/gcc` (`gcc 13.3`) succeeds, so the helper defaults to that compiler. - AIX currently does not use `cargo auditable`: cargo-auditable emits ELF/generic Unix linker inputs and flags that AIX's XCOFF linker rejects. - AIX currently uses `aix-optimized-release` instead of `optimized-release`: the IBM Rust SDK 1.92 fails LTO even for a tiny hello-world crate with `failed to get bitcode from object file for LTO (Can't find section .ipa)`. - The helper still uses the same metadata inputs that affect the ADP binary (`APP_FULL_NAME`, `APP_SHORT_NAME`, `APP_IDENTIFIER`, `APP_VERSION`, `APP_GIT_HASH`, `APP_BUILD_TIME`, `APP_DEV_BUILD`) and passes `BUILD_FEATURES` through to Cargo. - Toolchain version prefixes are overrideable through `ADP_AIX_EXPECTED_*_PREFIX` variables when an intentional toolchain update occurs. ## Test Plan - [x] `bash -n ci/tooling/build-adp-aix.sh` - [x] `ADP_AIX_BUILD_DRY_RUN=true make build-adp-aix` - [x] `cargo metadata --no-deps --format-version 1` - [x] AIX: `CARGO_HOME=/opt/cargo-home-aix-adp-pr-stack CARGO_TARGET_DIR=/opt/saluki-aix-adp-pr-stack-target make build-adp-aix` - [x] AIX: `/opt/saluki-aix-adp-pr-stack-target/aix-optimized-release/agent-data-plane --help` - [x] AIX: `/opt/saluki-aix-adp-pr-stack-target/aix-optimized-release/agent-data-plane version` - [x] Pre-commit hook: `fmt`, `check-clippy`, `check-licenses`, `check-deny`, `check-docs`, `generate-api-docs` AIX toolchain observed: - `cargo 1.92.0 (IBM Open SDK for Rust on AIX 1.92.0.0)` - `rustc 1.92.0 (IBM Open SDK for Rust on AIX 1.92.0.0)` - `gcc (GCC) 13.3.0` - `g++ (GCC) 13.3.0` AIX build result: - `Finished aix-optimized-release profile [optimized + debuginfo] target(s) in 26m 22s` - Binary: `64-bit XCOFF executable or object module not stripped` Co-authored-by: travis.thieman <travis.thieman@datadoghq.com>
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Summary
Adds AIX platform defaults to
datadog-agent-commonsso platform settings resolve when building ADP on AIX.This is one of the Saluki-side blockers from DADP-142 / the AIX Confluence notes. After getting past
process-memoryandstringtheory, the AIX ADP build stopped indatadog-agent-commonsbecauseplatform/mod.rsreferenced platform constants/functions that are not defined for AIX.Key changes
platform/aix_impl.rswith AIX config, log, and syslog defaults.platform/mod.rs.AIX defaults
The AIX defaults match the standard Datadog Agent paths used in the AIX build notes:
/etc/datadog-agent/var/log/datadogunixgram:///dev/logContinuation context
This PR is part of a three-PR Saluki-side AIX enablement stack:
process-memoryAIX RSS support.MetaString#2032:stringtheorybig-endianMetaStringfallback.datadog-agent-commonsAIX platform settings.A separate upstream/fork fix is still needed for
aws-lc-rs; during validation I used the local checkout of Travis's fork/branch on the AIX host. That temporary override is not included in this PR.Temporary AIX validation setup used on
soaix499:Test plan
cargo test -p datadog-agent-commons platform::tests::aix_uses_standard_agent_paths --no-runfailed because AIX platform constants/functions were missing.cargo fmt --package datadog-agent-commons --allcargo check -p datadog-agent-commonscargo test -p datadog-agent-commons platform::testsgit diff --checksoaix499):cargo test -p datadog-agent-commons platform::tests::aix_uses_standard_agent_pathsaix_uses_standard_agent_paths ... oksoaix499) with temporary localaws-lc-rspatch plus fix(process-memory): support RSS queries on AIX #2031 and fix(stringtheory): support big-endian platforms forMetaString#2032 synced:cargo build -p agent-data-plane/home/zkvhn/dd/saluki-target/debug/agent-data-plane.fileas64-bit XCOFF executable or object module not stripped.Notes
aws-lc-rspatch used for AIX validation.--no-verifybecause the local hook/check path attempted broad workspace/nightly checks and was killed by the local machine while unrelated to this targeted crate change. The targeted commands above were run separately.