diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | Cargo.lock | 1183 | ||||
| -rw-r--r-- | Cargo.toml | 16 | ||||
| -rw-r--r-- | build.rs | 10 | ||||
| -rw-r--r-- | flake.lock | 82 | ||||
| -rw-r--r-- | flake.nix | 89 | ||||
| -rw-r--r-- | src/bpf_intf.rs | 9 | ||||
| -rw-r--r-- | src/bpf_skel.rs | 4 | ||||
| -rw-r--r-- | src/main.rs | 138 |
9 files changed, 1532 insertions, 0 deletions
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diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..8d984a8 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,16 @@ +[package] +name = "power_sched" +version = "0.1.0" +edition = "2021" + +[dependencies] +anyhow = "1.0.96" +ctrlc = "3.4.5" +libbpf-rs = "0.24.8" +libc = "0.2.170" +plain = "0.2.3" +scx_utils = "1.0.11" +scx_rustland_core = "2.2.8" + +[build-dependencies] +scx_rustland_core = "2.2.8" diff --git a/build.rs b/build.rs new file mode 100644 index 0000000..ad7ee97 --- /dev/null +++ b/build.rs @@ -0,0 +1,10 @@ +// This software may be used and distributed according to the terms of the +// GNU General Public License version 2. +// + +fn main() { + scx_rustland_core::RustLandBuilder::new() + .unwrap() + .build() + .unwrap(); +} diff --git a/flake.lock b/flake.lock new file mode 100644 index 0000000..ff34f7f --- /dev/null +++ b/flake.lock @@ -0,0 +1,82 @@ +{ + "nodes": { + "flake-utils": { + "inputs": { + "systems": "systems" + }, + "locked": { + "lastModified": 1731533236, + "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=", + "owner": "numtide", + "repo": "flake-utils", + "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b", + "type": "github" + }, + "original": { + "owner": "numtide", + "repo": "flake-utils", + "type": "github" + } + }, + "nixpkgs": { + "locked": { + "lastModified": 1740367490, + "narHash": "sha256-WGaHVAjcrv+Cun7zPlI41SerRtfknGQap281+AakSAw=", + "owner": "NixOS", + "repo": "nixpkgs", + "rev": "0196c0175e9191c474c26ab5548db27ef5d34b05", + "type": "github" + }, + "original": { + "owner": "NixOS", + "ref": "nixos-unstable", + "repo": "nixpkgs", + "type": "github" + } + }, + "root": { + "inputs": { + "flake-utils": "flake-utils", + "nixpkgs": "nixpkgs", + "rust-overlay": "rust-overlay" + } + }, + "rust-overlay": { + "inputs": { + "nixpkgs": [ + "nixpkgs" + ] + }, + "locked": { + "lastModified": 1740450604, + "narHash": "sha256-T/lqASXzCzp5lJISCUw+qwfRmImVUnhKgAhn8ymRClI=", + "owner": "oxalica", + "repo": "rust-overlay", + "rev": "5961ca311c85c31fc5f51925b4356899eed36221", + "type": "github" + }, + "original": { + "owner": "oxalica", + "repo": "rust-overlay", + "type": "github" + } + }, + "systems": { + "locked": { + "lastModified": 1681028828, + "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=", + "owner": "nix-systems", + "repo": "default", + "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e", + "type": "github" + }, + "original": { + "owner": "nix-systems", + "repo": "default", + "type": "github" + } + } + }, + "root": "root", + "version": 7 +} diff --git a/flake.nix b/flake.nix new file mode 100644 index 0000000..7cdb63d --- /dev/null +++ b/flake.nix @@ -0,0 +1,89 @@ +{ + description = "BPF-based scheduler using sched-ext"; + + inputs = { + nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; + flake-utils.url = "github:numtide/flake-utils"; + rust-overlay = { + url = "github:oxalica/rust-overlay"; + inputs = { + nixpkgs.follows = "nixpkgs"; + flake-utils.follows = "flake-utils"; + }; + }; + }; + + outputs = { self, nixpkgs, flake-utils, rust-overlay }: + flake-utils.lib.eachDefaultSystem (system: + let + overlays = [ (import rust-overlay) ]; + pkgs = import nixpkgs { + inherit system overlays; + config = { + hardeningDisable = [ "stackprotector" "zerocallusedregs" ]; + }; + }; + + # Use a stable rust with specific components + rustVersion = pkgs.rust-bin.stable.latest.default.override { + extensions = [ "rust-src" "rust-analyzer" "clippy" "rustfmt" ]; + }; + + # Dependencies based on scx_rustscheds + nativeBuildInputs = with pkgs; [ + pkg-config + rustVersion + llvmPackages.clang + bpftools # bpftool + ]; + + buildInputs = with pkgs; [ + elfutils + zlib + zstd + libbpf + ]; + + # Environment variables needed for compilation + shellEnv = { + LIBCLANG_PATH = "${pkgs.lib.getLib pkgs.llvmPackages.libclang}/lib"; + BPF_CLANG = pkgs.lib.getExe pkgs.llvmPackages.clang; + BPF_EXTRA_CFLAGS_PRE_INCL = pkgs.lib.concatStringsSep " " [ + "-I${pkgs.libbpf}/include" + "-I${pkgs.libbpf}/include/uapi" + "-I${pkgs.libbpf}/include/linux" + ]; + BPF_EXTRA_CFLAGS = "-fno-stack-protector"; + RUSTFLAGS = pkgs.lib.concatStringsSep " " [ + "-C relocation-model=pic" + "-C link-args=-lelf" + "-C link-args=-lz" + "-C link-args=-lzstd" + "-L ${pkgs.libbpf}/lib" + ]; + }; + in + { + # Development shell with all dependencies + devShells.default = pkgs.mkShell { + inherit nativeBuildInputs buildInputs; + inherit (shellEnv) LIBCLANG_PATH BPF_CLANG BPF_EXTRA_CFLAGS_PRE_INCL BPF_EXTRA_CFLAGS RUSTFLAGS; + hardeningDisable = [ "stackprotector" "zerocallusedregs" ]; + + # Additional development tools + packages = with pkgs; [ + cargo-watch + cargo-expand + just + ]; + + # Shell hook to print some useful info + shellHook = '' + echo "BPF scheduler development environment" + echo "Kernel: $(uname -r)" + echo "Rust: $(rustc --version)" + echo "Clang: $(clang --version | head -n1)" + ''; + }; + }); +} diff --git a/src/bpf_intf.rs b/src/bpf_intf.rs new file mode 100644 index 0000000..9db020e --- /dev/null +++ b/src/bpf_intf.rs @@ -0,0 +1,9 @@ +// This software may be used and distributed according to the terms of the +// GNU General Public License version 2. + +#![allow(non_upper_case_globals)] +#![allow(non_camel_case_types)] +#![allow(non_snake_case)] +#![allow(dead_code)] + +include!(concat!(env!("OUT_DIR"), "/bpf_intf.rs")); diff --git a/src/bpf_skel.rs b/src/bpf_skel.rs new file mode 100644 index 0000000..c42af33 --- /dev/null +++ b/src/bpf_skel.rs @@ -0,0 +1,4 @@ +// This software may be used and distributed according to the terms of the +// GNU General Public License version 2. + +include!(concat!(env!("OUT_DIR"), "/bpf_skel.rs")); diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..784d038 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,138 @@ +mod bpf_skel; +pub use bpf_skel::*; +pub mod bpf_intf; + +#[rustfmt::skip] +mod bpf; +use bpf::*; + +use scx_utils::UserExitInfo; + +use libbpf_rs::OpenObject; + +use std::collections::VecDeque; +use std::mem::MaybeUninit; + +use anyhow::Result; + +const SLICE_US: u64 = 5000; + +struct Scheduler<'a> { + bpf: BpfScheduler<'a>, + task_queue: VecDeque<QueuedTask>, +} + +impl<'a> Scheduler<'a> { + fn init(open_object: &'a mut MaybeUninit<OpenObject>) -> Result<Self> { + let bpf = BpfScheduler::init( + open_object, + 0, // exit_dump_len (buffer size of exit info, 0 = default) + false, // partial (false = include all tasks) + false, // debug (false = debug mode off) + )?; + dbg!("registering rust user space scheduler"); + Ok(Self { + bpf, + task_queue: VecDeque::new(), + }) + } + + fn consume_all_tasks(&mut self) { + // Consume all tasks that are ready to run. + // + // Each task contains the following details: + // + // pub struct QueuedTask { + // pub pid: i32, // pid that uniquely identifies a task + // pub cpu: i32, // CPU where the task is running + // pub sum_exec_runtime: u64, // Total cpu time + // pub weight: u64, // Task static priority + // pub nvcsw: u64, // Total amount of voluntary context switches + // pub slice: u64, // Remaining time slice budget + // pub vtime: u64, // Current task vruntime / deadline (set by the scheduler) + // } + // + // Although the FIFO scheduler doesn't use these fields, they can provide valuable data for + // implementing more sophisticated scheduling policies. + while let Ok(Some(task)) = self.bpf.dequeue_task() { + self.task_queue.push_back(task); + } + } + + fn dispatch_next_task(&mut self) { + if let Some(task) = self.task_queue.pop_front() { + // Create a new task to be dispatched, derived from the received enqueued task. + // + // pub struct DispatchedTask { + // pub pid: i32, // pid that uniquely identifies a task + // pub cpu: i32, // target CPU selected by the scheduler + // pub flags: u64, // special dispatch flags + // pub slice_ns: u64, // time slice assigned to the task (0 = default) + // } + // + // The dispatched task's information are pre-populated from the QueuedTask and they can + // be modified before dispatching it via self.bpf.dispatch_task(). + let mut dispatched_task = DispatchedTask::new(&task); + + // Decide where the task needs to run (target CPU). + // + // A call to select_cpu() will return the most suitable idle CPU for the task, + // considering its previously used CPU. + let cpu = self.bpf.select_cpu(task.pid, task.cpu, 0); + if cpu >= 0 { + dispatched_task.cpu = cpu; + } else { + dispatched_task.flags |= RL_CPU_ANY as u64; + } + + // Decide for how long the task needs to run (time slice); if not specified + // SCX_SLICE_DFL will be used by default. + dispatched_task.slice_ns = SLICE_US; + + // Dispatch the task on the target CPU. + self.bpf.dispatch_task(&dispatched_task).unwrap(); + + // Notify the BPF component of the number of pending tasks and immediately give a + // chance to run to the dispatched task. + self.bpf.notify_complete(self.task_queue.len() as u64); + } + } + + fn dispatch_tasks(&mut self) { + loop { + // Consume all tasks before dispatching any. + self.consume_all_tasks(); + + // Dispatch one task from the queue. + self.dispatch_next_task(); + + // If no task is ready to run (or in case of error), stop dispatching tasks and notify + // the BPF component that all tasks have been scheduled / dispatched, with no remaining + // pending tasks. + if self.task_queue.is_empty() { + self.bpf.notify_complete(0); + break; + } + } + } + + fn run(&mut self) -> Result<UserExitInfo> { + while !self.bpf.exited() { + self.dispatch_tasks(); + } + self.bpf.shutdown_and_report() + } +} + +fn main() -> Result<()> { + // Initialize and load the FIFO scheduler. + let mut open_object = MaybeUninit::uninit(); + loop { + let mut sched = Scheduler::init(&mut open_object)?; + if !sched.run()?.should_restart() { + break; + } + } + + Ok(()) +} |