feat: profile memory of command

[not-matthias]

Changes in this PR:

• Add MessagePack serialization for markers and heaptrack results
• Made the RunnerFifo shared across modes (walltime and memory use it at the moment)
• Added the heaptrack CLI + support to enable/disable it via IPC
• Added the memory executor (WIP)

TODO:

• Create release CI for codspeed-heaptrack
• Fix lints
• Add upload implementation for memory
• Parse the backend response skipped for now, we'll add this later
• Ensure env forwarding works (cargo codspeed run)
• Rename to memtrack

[Copilot]

Pull request overview

This pull request adds memory profiling capability to the codebase through a new Memory executor that uses eBPF-based tracking via a custom heaptrack crate. The implementation allows tracking memory allocations (malloc, free, calloc, realloc, etc.) in benchmarked programs.

Key Changes:

• Introduces a new MemoryExecutor that uses eBPF uprobes to track memory allocations
• Adds a heaptrack crate with BPF programs for monitoring malloc/free and related syscalls
• Refactors FIFO communication handling into shared code to support multiple executor types
• Updates test snapshots to use Git LFS for large binary data

Reviewed changes

Copilot reviewed 52 out of 54 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/run/runner/memory/executor.rs	Implements the new Memory executor using heaptrack IPC for control
src/run/runner/shared/fifo.rs	Extracts shared FIFO message handling logic for reuse across executors
src/run/runner/wall_time/perf/mod.rs	Refactors to use shared FIFO handling code
crates/heaptrack/*	New crate providing eBPF-based memory tracking with BPF programs and IPC
src/run/uploader/upload.rs	Adds Memory executor case (currently unimplemented)
flake.nix	Adds Nix development environment configuration
.github/workflows/ci.yml	Updates CI to install dependencies and run BPF tests separately
Snapshot files	Migrates large test snapshots to Git LFS

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[GuillaumeLagrange]

CI does not build, and the CI change commit scares me a bit, going forward not gonna lie

Just so I know, have you had the protobuf decision challenged ?
Could be good to have a small design document just to make sure the whole team is aligned behind the choice.

[not-matthias]

@GuillaumeLagrange As discussed, I updated the benchmark result types to use rmp-serde. The file names are now also based on the struct name:

[14:28] not-matthias@~ > eza -alh /tmp/profile.Hrgnlk6YFL.out/results
Permissions Size User         Date Modified Name
.rw-r--r--  658k root          3 Dec 14:28  592283.HeaptrackResult.msgpack
.rw-r--r--  2.4k not-matthias  3 Dec 14:28  MarkerResult.msgpack

[GuillaumeLagrange]

Really cool! Let me know if you want to discuss naming

[GuillaumeLagrange]

olgtm

[Copilot]

Pull request overview

Copilot reviewed 47 out of 48 changed files in this pull request and generated 2 comments.

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[not-matthias]

As discussed, I'll merge this now and we'll implement further improvements and fixes afterwards.