Add ring options

examples/Cargo.toml

@@ -53,6 +53,10 @@ path = "h1-server.rs"
 name = "h1-server-multishot"
 path = "h1-server-multishot.rs"
 
+[[example]]
+name = "proactor-config-fwrite"
+path = "proactor-config-fwrite.rs"
+
 [[example]]
 name = "tcp-server"
 path = "tcp-server.rs"

examples/proactor-config-fwrite.rs

@@ -0,0 +1,69 @@
+use nuclei::*;
+use std::fs::{File, OpenOptions};
+use std::io;
+use std::path::PathBuf;
+use std::time::Duration;
+
+use futures::io::SeekFrom;
+use futures::{AsyncReadExt, AsyncSeekExt, AsyncWriteExt};
+use nuclei::config::{IoUringConfiguration, NucleiConfig};
+
+const DARK_MATTER_TEXT: &'static str = "\
+Dark matter is a form of matter thought to account for approximately \
+85% of the matter in the universe and about a quarter of its total \
+mass–energy density or about 2.241×10−27 kg/m3. Its presence is implied \
+in a variety of astrophysical observations, including gravitational effects \
+that cannot be explained by accepted theories of gravity unless more matter \
+is present than can be seen. For this reason, most experts think that dark \
+matter is abundant in the universe and that it has had a strong influence \
+on its structure and evolution. Dark matter is called dark because it does \
+not appear to interact with the electromagnetic field, which means it doesn't \
+absorb, reflect or emit electromagnetic radiation, and is therefore difficult \
+to detect.[1]\
+\
+";
+
+// #[nuclei::main]
+fn main() -> io::Result<()> {
+    let nuclei_config = NucleiConfig {
+        // Other options for IO_URING are:
+        // * low_latency_driven,
+        // * kernel_poll_only
+        // * io_poll
+        iouring: IoUringConfiguration::interrupt_driven(1 << 11),
+    };
+    let _ = Proactor::with_config(nuclei_config);
+
+    // Approximately ~75,9 MB
+    let dark_matter = vec![DARK_MATTER_TEXT; 100_000].join("\n");
+
+    let mut path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    path.push("data");
+    path.push("dark-matter");
+
+    drive(async {
+        // Approximately ~75,9 MB
+        let dark_matter = vec![DARK_MATTER_TEXT; 100_000].join("\n");
+
+        let mut path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+        path.push("data");
+        path.push("dark-matter");
+
+        let fo = OpenOptions::new()
+            .read(true)
+            .write(true)
+            .open(&path)
+            .unwrap();
+        let mut file = Handle::<File>::new(fo).unwrap();
+        file.write_all(dark_matter.as_bytes()).await.unwrap();
+
+        let mut buf = vec![];
+        assert!(file.seek(SeekFrom::Start(0)).await.is_ok());
+        assert_eq!(file.read_to_end(&mut buf).await.unwrap(), dark_matter.len());
+        assert_eq!(&buf[0..dark_matter.len()], dark_matter.as_bytes());
+
+        println!("Length of file is {}", buf.len());
+    });
+
+    Ok(())
+}

src/async_io.rs

@@ -209,9 +209,9 @@ impl AsyncRead for Handle<File> {
         cx: &mut Context<'_>,
         bufs: &mut [IoSliceMut<'_>],
     ) -> Poll<io::Result<usize>> {
-        let mut store = &mut self.get_mut().store_file;
+        let store = &mut self.get_mut().store_file;
 
-        if let Some(mut store_file) = store.as_mut() {
+        if let Some(store_file) = store.as_mut() {
             let fd: RawFd = store_file.receive_fd();
             let op_state = store_file.op_state();
             let (_, pos) = store_file.bufpair();
@@ -239,10 +239,10 @@ const NON_READ: &[u8] = &[];
 
 #[cfg(all(feature = "iouring", target_os = "linux"))]
 impl AsyncBufRead for Handle<File> {
-    fn poll_fill_buf(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<&[u8]>> {
-        let mut store = &mut self.get_mut().store_file;
+    fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<&[u8]>> {
+        let store = &mut self.get_mut().store_file;
 
-        if let Some(mut store_file) = store.as_mut() {
+        if let Some(store_file) = store.as_mut() {
             let fd: RawFd = store_file.receive_fd();
             let op_state = store_file.op_state();
             let (bufp, pos) = store_file.bufpair();
@@ -267,7 +267,7 @@ impl AsyncBufRead for Handle<File> {
     }
 
     fn consume(self: Pin<&mut Self>, amt: usize) {
-        let mut store = self.get_mut().store_file.as_mut().unwrap();
+        let store = self.get_mut().store_file.as_mut().unwrap();
         store.buf().consume(amt);
     }
 }
@@ -279,9 +279,9 @@ impl AsyncWrite for Handle<File> {
         cx: &mut Context<'_>,
         bufslice: &[u8],
     ) -> Poll<io::Result<usize>> {
-        let mut store = &mut self.get_mut().store_file;
+        let store = &mut self.get_mut().store_file;
 
-        if let Some(mut store_file) = store.as_mut() {
+        if let Some(store_file) = store.as_mut() {
             let fd: RawFd = store_file.receive_fd();
             let op_state = store_file.op_state();
             let (bufp, pos) = store_file.bufpair();
@@ -319,9 +319,9 @@ impl AsyncWrite for Handle<File> {
         cx: &mut Context<'_>,
         bufs: &[IoSlice<'_>],
     ) -> Poll<io::Result<usize>> {
-        let mut store = &mut self.get_mut().store_file;
+        let store = &mut self.get_mut().store_file;
 
-        if let Some(mut store_file) = store.as_mut() {
+        if let Some(store_file) = store.as_mut() {
             let fd: RawFd = store_file.receive_fd();
             let op_state = store_file.op_state();
             let (_, pos) = store_file.bufpair();
@@ -349,9 +349,9 @@ impl AsyncWrite for Handle<File> {
     }
 
     fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
-        let mut store = &mut self.get_mut().store_file;
+        let store = &mut self.get_mut().store_file;
 
-        if let Some(mut store_file) = store.as_mut() {
+        if let Some(store_file) = store.as_mut() {
             let fd: RawFd = store_file.receive_fd();
             let op_state = store_file.op_state();
 
@@ -377,7 +377,7 @@ impl AsyncSeek for Handle<File> {
         cx: &mut Context<'_>,
         pos: SeekFrom,
     ) -> Poll<io::Result<u64>> {
-        let mut store = &mut self.get_mut().store_file.as_mut().unwrap();
+        let store = &mut self.get_mut().store_file.as_mut().unwrap();
 
         let (cursor, offset) = match pos {
             io::SeekFrom::Start(n) => {
@@ -392,7 +392,7 @@ impl AsyncSeek for Handle<File> {
             }
         };
         let valid_seek = if offset.is_negative() {
-            match cursor.checked_sub(offset.abs() as usize) {
+            match cursor.checked_sub(offset.unsigned_abs() as usize) {
                 Some(valid_seek) => valid_seek,
                 None => {
                     let invalid = io::Error::from(io::ErrorKind::InvalidInput);

src/config.rs

@@ -55,16 +55,89 @@ pub struct IoUringConfiguration {
     /// If [None] passed unbounded workers will be limited by the process task limit,
     /// as indicated by the rlimit [RLIMIT_NPROC](https://man7.org/linux/man-pages/man2/getrlimit.2.html) limit.
     pub per_numa_unbounded_worker_count: Option<u32>,
+
+    /// This argument allows aggressively waiting on CQ(completion queue) to have low latency of IO completions.
+    /// Basically, this argument polls CQEs(completion queue events) directly on cq at userspace.
+    /// Mind that, using this increase pressure on CPUs from userspace side. By default, nuclei reaps the CQ with
+    /// aggressive wait. This is double polling approach for nuclei where Kernel gets submissions by itself (SQPOLL),
+    /// processes it and puts completions to completion queue and we immediately pick up without latency
+    /// (aggressive_poll).
+    ///
+    /// **[default]**: `true`.
+    pub aggressive_poll: bool,
+
+    /// Perform busy-waiting for I/O completion events, as opposed to getting notifications via an
+    /// asynchronous IRQ (Interrupt Request). This will reduce latency, but increases CPU usage.
+    /// This is only usable on file systems that support polling and files opened with `O_DIRECT`.
+    ///
+    /// **[default]**: `false`.
+    pub iopoll_enabled: bool,
     // XXX: `redrive_kthread_wake` = bool, syncs queue changes so kernel threads got awakened. increased cpu usage.
 }
 
+impl IoUringConfiguration {
+    ///
+    /// Standard way to use IO_URING. No polling, purely IRQ awaken IO completion.
+    /// This is a normal way to process IO, mind that with this approach
+    /// `actual completion time != userland reception of completion`.
+    /// Throughput is low compared to all the other config alternatives.
+    ///
+    /// **NOTE:** If you don't know what to select as configuration, please select this.
+    pub fn interrupt_driven(queue_len: u32) -> Self {
+        Self {
+            queue_len,
+            sqpoll_wake_interval: None,
+            per_numa_bounded_worker_count: None,
+            per_numa_unbounded_worker_count: None,
+            aggressive_poll: false,
+            iopoll_enabled: false,
+        }
+    }
+
+    ///
+    /// Low Latency Driven version of IO_URING, where it is suitable for high traffic environments.
+    /// High throughput low latency solution where it consumes a lot of resources.
+    pub fn low_latency_driven(queue_len: u32) -> Self {
+        Self {
+            queue_len,
+            sqpoll_wake_interval: Some(2),
+            aggressive_poll: true,
+            ..Self::default()
+        }
+    }
+
+    ///
+    /// Kernel poll only version of IO_URING, where it is suitable for high traffic environments.
+    /// This version won't allow aggressive polling on completion queue(CQ).
+    pub fn kernel_poll_only(queue_len: u32) -> Self {
+        Self {
+            queue_len,
+            sqpoll_wake_interval: Some(2),
+            aggressive_poll: true,
+            ..Self::default()
+        }
+    }
+
+    ///
+    /// IOPOLL enabled ring configuration for operating on files with low-latency.
+    pub fn io_poll(queue_len: u32) -> Self {
+        Self {
+            queue_len,
+            iopoll_enabled: true,
+            ..Self::default()
+        }
+    }
+}
+
 impl Default for IoUringConfiguration {
     fn default() -> Self {
         Self {
             queue_len: 1 << 11,
             sqpoll_wake_interval: Some(2),
             per_numa_bounded_worker_count: Some(1 << 8),
             per_numa_unbounded_worker_count: Some(1 << 9),
+            aggressive_poll: true,
+            iopoll_enabled: false,
         }
     }
 }

src/proactor.rs

@@ -1,10 +1,9 @@
-use std::ops::DerefMut;
 use std::task::{Context, Poll};
 use std::time::Duration;
 use std::{future::Future, io};
 
 use crate::config::NucleiConfig;
-use once_cell::sync::{Lazy, OnceCell};
+use once_cell::sync::OnceCell;
 
 use super::syscore::*;
 use super::waker::*;
@@ -25,7 +24,7 @@ impl Proactor {
     /// Returns a reference to the proactor.
     pub fn get() -> &'static Proactor {
         unsafe {
-            &PROACTOR.get_or_init(|| {
+            PROACTOR.get_or_init(|| {
                 Proactor(
                     SysProactor::new(NucleiConfig::default())
                         .expect("cannot initialize IO backend"),
@@ -37,15 +36,14 @@ impl Proactor {
     /// Builds a proactor instance with given config and returns a reference to it.
     pub fn with_config(config: NucleiConfig) -> &'static Proactor {
         unsafe {
-            let mut proactor =
+            let proactor =
                 Proactor(SysProactor::new(config.clone()).expect("cannot initialize IO backend"));
             PROACTOR
                 .set(proactor)
                 .map_err(|e| "Proactor instance not being able to set.")
                 .unwrap();
-            let proactor =
-                Proactor(SysProactor::new(config).expect("cannot initialize IO backend"));
-            &PROACTOR.get_or_init(|| proactor)
+
+            PROACTOR.wait()
         }
     }
 
@@ -133,6 +131,7 @@ mod proactor_tests {
                 sqpoll_wake_interval: Some(11),
                 per_numa_bounded_worker_count: Some(12),
                 per_numa_unbounded_worker_count: Some(13),
+                ..IoUringConfiguration::default()
             },
         };
         let new = Proactor::with_config(config);

src/syscore/linux/iouring/fs/buffer.rs

@@ -47,7 +47,7 @@ impl Buffer {
             unsafe {
                 let data: *mut u8 = self.data.cast().as_ptr();
                 let cap = self.cap - self.pos;
-                slice::from_raw_parts(data.offset(self.pos as isize), cap as usize)
+                slice::from_raw_parts(data.add(self.pos), cap)
             }
         } else {
             &[]
@@ -81,7 +81,7 @@ impl Buffer {
 
     #[inline(always)]
     pub fn consume(&mut self, amt: usize) {
-        self.pos = cmp::min(self.pos + amt as usize, self.cap);
+        self.pos = cmp::min(self.pos + amt, self.cap);
     }
 
     #[inline(always)]

src/syscore/linux/iouring/fs/mod.rs

@@ -2,6 +2,4 @@ pub(crate) mod buffer;
 pub(crate) mod cancellation;
 pub(crate) mod store_file;
 
-pub(crate) use buffer::*;
-pub(crate) use cancellation::*;
 pub(crate) use store_file::*;

src/syscore/linux/iouring/fs/store_file.rs

@@ -1,16 +1,12 @@
-use crate::Handle;
-use lever::sync::prelude::TTas;
 use std::fs::File;
 use std::io;
-use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
+use std::os::unix::io::{FromRawFd, RawFd};
 use std::pin::Pin;
 use std::sync::Arc;
 
 use super::buffer::Buffer;
 use crate::syscore::Processor;
 use lever::sync::atomics::AtomicBox;
-use pin_utils::unsafe_pinned;
-use std::task::{Context, Poll};
 
 pub struct StoreFile {
     fd: RawFd,
@@ -87,7 +83,7 @@ impl StoreFile {
         &mut self.pos
     }
 
-    pub(crate) fn guard_op(self: &mut Self, op: Op) {
+    pub(crate) fn guard_op(&mut self, op: Op) {
         // let this = unsafe { Pin::get_unchecked_mut(self) };
         // if *self.op_state.get() != Op::Pending && *self.op_state.get() != op {
         //     self.cancel();