DataDog/glommio

📋 Notable changes:

• #427, #480, #500: Executor builders are now more reliable and flexible;
• #412, #413 : `Task<T>::local()` and `Local::local()` are removed in favor of the `glommio::spawn_*` set of free functions, `glommio::executor()` is now the main way to interact with the executor;
• #414: Closing a file now returns whether the underlying file descriptor was closed;
• #416: `read_many` now takes a stream as input instead of an iterator;
• #460, #491: `read_many` is now able to limit concurrency based on in-flight IO memory and/or number of in-flight IO requests;
• #497: `read_many` now uses better, system-specific IO coalescing defaults from `sysfs`;
• #434: Foreign wakers now trigger a remote preemption, according to their latency requirements;
• #449, #474: `DmaStreamReader` may now be consumed trivially without copies;
• + 7 more

📦 Rust/Linux support:

• The minimum supported kernel remains 5.8, and we now require at least Rust 1.58.

📦 Contributors:

• ```
• Andrey Lomakin <lomakin.andrey@gmail.com>
• Cody P Schafer <dev@codyps.com>
• David Blewett <david.blewett@datadoghq.com>
• Duarte Nunes <duarte.nunes@datadoghq.com>
• Glauber Costa <glauber@chiselstrike.com>
• Hippolyte Barraud <hippolyte.barraud@datadoghq.com>
• jianghua <jianghua@qiyi.com>
• + 10 more

📋 Changes

• There is now an `ImmutableFile` type, that encodes the fact that a file will never change, opening the door for file-level optimizations like metadata caching and request deduplication
• There is an API to submit I/O in bulk (`read_many`)
• There is way to create many executors at once, executing homogeneous code `LocalExecutorPool`

📋 Changes

• Using io_uring's linked SQEs, we can now timeout network requests.
• There is also a generic `timeout` function that can timeout any task.
• There are statistics about CPU usage coming from the `LocalExecutor`, so you can see which tasks are using CPU the most.
• There are statistics bout storage I/O usage coming from the `Reactor`, so you can see how I/O is being generated, and by each tasks.
• The mesh channel now has a `send_to` function, useful when you want to send one-shot messages.
• The Glommio wakers can now be used remotely from other threads. In particular, that means that Tokio channels can now be used to communicate with Glommio executors.