From ab7313ff6b9107c8b9c6a068c620ac56935b80e7 Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Sun, 17 Dec 2023 16:34:51 -0600 Subject: [PATCH 1/3] io: add budgeting to tokio::runtime::io::registration::async_io (#6221) Fixes #5946. Fixes #4782. This change adds budgeting to most of the remaining unbudgeted IO operations which can complete instantly, including datagram send/recv operations and listener socket accepts. This is particularly significant for scenarios in which resource limits are hit, as it can be common for things like listener tasks to spin when receiving errors and just log them, busy looping worker threads which might otherwise be handling existing connections and closing them. This can also sometimes lead to complex failure scenarios within datagram systems experiencing resource exhaustion. --- .github/workflows/ci.yml | 30 +- Cargo.lock | 1515 ++++++++++++++++++++++++-- tokio/src/runtime/context.rs | 14 +- tokio/src/runtime/io/registration.rs | 7 +- tokio/tests/coop_budger.rs | 77 ++ 5 files changed, 1504 insertions(+), 139 deletions(-) create mode 100644 tokio/tests/coop_budger.rs diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index e0687becfec..b92ea95452d 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -46,7 +46,7 @@ jobs: - cross-test - no-atomic-u64 - features - - minrust +# - minrust - minimal-versions - fmt - clippy @@ -342,20 +342,20 @@ jobs: env: RUSTFLAGS: --cfg tokio_unstable -Dwarnings - minrust: - name: minrust - runs-on: ubuntu-latest - steps: - - uses: actions/checkout@v3 - - name: Install Rust ${{ env.rust_min }} - uses: dtolnay/rust-toolchain@master - with: - toolchain: ${{ env.rust_min }} - - uses: 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drivers, etc... #[cfg(feature = "rt")] handle: RefCell::new(None), #[cfg(feature = "rt")] current_task_id: Cell::new(None), - /// Tracks if the current thread is currently driving a runtime. - /// Note, that if this is set to "entered", the current scheduler - /// handle may not reference the runtime currently executing. This - /// is because other runtime handles may be set to current from - /// within a runtime. + // Tracks if the current thread is currently driving a runtime. + // Note, that if this is set to "entered", the current scheduler + // handle may not reference the runtime currently executing. This + // is because other runtime handles may be set to current from + // within a runtime. #[cfg(feature = "rt")] runtime: Cell::new(EnterRuntime::NotEntered), diff --git a/tokio/src/runtime/io/registration.rs b/tokio/src/runtime/io/registration.rs index 140b9240ae4..92e0a2e9b7a 100644 --- a/tokio/src/runtime/io/registration.rs +++ b/tokio/src/runtime/io/registration.rs @@ -239,11 +239,16 @@ cfg_io_readiness! { loop { let event = self.readiness(interest).await?; + let coop = crate::future::poll_fn(crate::runtime::coop::poll_proceed).await; + match f() { Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { self.clear_readiness(event); } - x => return x, + x => { + coop.made_progress(); + return x + }, } } } diff --git a/tokio/tests/coop_budger.rs b/tokio/tests/coop_budger.rs new file mode 100644 index 00000000000..0c4cc7e6497 --- /dev/null +++ b/tokio/tests/coop_budger.rs @@ -0,0 +1,77 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "full", target_os = "linux"))] + +use std::sync::atomic::{AtomicUsize, Ordering}; +use std::sync::Arc; +use tokio::net::UdpSocket; + +/// Ensure that UDP sockets have functional budgeting +/// +/// # Design +/// Two sockets communicate by spamming packets from one to the other. +/// +/// In Linux, this packet will be slammed through the entire network stack and into the receiver's buffer during the +/// send system call because we are using the loopback interface. +/// This happens because the softirq chain invoked on send when using the loopback interface covers virtually the +/// entirety of the lifecycle of a packet within the kernel network stack. +/// +/// As a result, neither socket will ever encounter an EWOULDBLOCK, and the only way for these to yield during the loop +/// is through budgeting. +/// +/// A second task runs in the background and increments a counter before yielding, allowing us to know how many times sockets yielded. +/// Since we are both sending and receiving, that should happen once per 64 packets, because budgets are of size 128 +/// and there are two budget events per packet, a send and a recv. +#[tokio::test] +async fn coop_budget_udp_send_recv() { + const BUDGET: usize = 128; + const N_ITERATIONS: usize = 1024; + + const PACKET: &[u8] = b"Hello, world"; + const PACKET_LEN: usize = 12; + + assert_eq!( + PACKET_LEN, + PACKET.len(), + "Defect in test, programmer can't do math" + ); + + // bind each socket to a dynamic port, forcing IPv4 addressing on the localhost interface + let tx = UdpSocket::bind("127.0.0.1:0").await.unwrap(); + let rx = UdpSocket::bind("127.0.0.1:0").await.unwrap(); + + tx.connect(rx.local_addr().unwrap()).await.unwrap(); + rx.connect(tx.local_addr().unwrap()).await.unwrap(); + + let tracker = Arc::new(AtomicUsize::default()); + + let tracker_clone = Arc::clone(&tracker); + + tokio::task::yield_now().await; + + tokio::spawn(async move { + loop { + tracker_clone.fetch_add(1, Ordering::SeqCst); + + tokio::task::yield_now().await; + } + }); + + for _ in 0..N_ITERATIONS { + tx.send(PACKET).await.unwrap(); + + let mut tmp = [0; PACKET_LEN]; + + // ensure that we aren't somehow accumulating other + assert_eq!( + PACKET_LEN, + rx.recv(&mut tmp).await.unwrap(), + "Defect in test case, received unexpected result from socket" + ); + assert_eq!( + PACKET, &tmp, + "Defect in test case, received unexpected result from socket" + ); + } + + assert_eq!(N_ITERATIONS / (BUDGET / 2), tracker.load(Ordering::SeqCst)); +} From 0d362339d55d051a1191632464fd1ea3acf1054c Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Tue, 19 Dec 2023 10:09:44 -0600 Subject: [PATCH 2/3] chore: release v1.25.3 (#6223) # 1.25.3 (December 17thm 2023) ### Fixed - io: add budgeting to `tokio::runtime::io::registration::async_io` ([#6221]) [#6221]: https://github.com/tokio-rs/tokio/pull/6221 --- Cargo.lock | 2 +- README.md | 2 +- tokio/CHANGELOG.md | 7 +++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 5 files changed, 11 insertions(+), 4 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index 79ac3b85f5e..83db3fe74e5 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1088,7 +1088,7 @@ dependencies = [ [[package]] name = "tokio" -version = "1.25.2" +version = "1.25.3" dependencies = [ "async-stream", "autocfg", diff --git a/README.md b/README.md index b63b781701a..11aaf9a722b 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.25.2", features = ["full"] } +tokio = { version = "1.25.3", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index b5cf019f50a..580f623271e 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,10 @@ +# 1.25.3 (December 17th, 2023) + +### Fixed +- io: add budgeting to `tokio::runtime::io::registration::async_io` ([#6221]) + +[#6221]: https://github.com/tokio-rs/tokio/pull/6221 + # 1.25.2 (September 22, 2023) Forward ports 1.20.6 changes. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index a0b3b710415..859328ca6e7 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.25.2" +version = "1.25.3" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index b63b781701a..11aaf9a722b 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.25.2", features = ["full"] } +tokio = { version = "1.25.3", features = ["full"] } ``` Then, on your main.rs: From c4f0178b7488cb5f32685e90fa9c58ce043c54ce Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 19 Dec 2023 18:06:01 +0100 Subject: [PATCH 3/3] chore: prepare Tokio v1.32.1 (#6228) --- README.md | 2 +- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 4a6671ad814..bc32bb01a0d 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.32.0", features = ["full"] } +tokio = { version = "1.32.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 5fd10187627..882709a34b6 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.32.1 (December 19, 2023) + +This is a forward part of a change that was backported to 1.25.3. + +### Fixed + +- io: add budgeting to `tokio::runtime::io::registration::async_io` ([#6221]) + +[#6221]: https://github.com/tokio-rs/tokio/pull/6221 + # 1.32.0 (August 16, 2023) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 19384b75d54..0e50137b7fe 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.32.0" +version = "1.32.1" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 4a6671ad814..bc32bb01a0d 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.32.0", features = ["full"] } +tokio = { version = "1.32.1", features = ["full"] } ``` Then, on your main.rs: