linux-kernel - Re: [PATCH v2 1/4] rust: sync: add `CondVar::notify

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Date: Mon, 18 Dec 2023 08:31:59 +0000
From: Tiago Lam <tiagolam@...il.com>
To: Alice Ryhl <aliceryhl@...gle.com>, Miguel Ojeda <ojeda@...nel.org>,
 Alex Gaynor <alex.gaynor@...il.com>,
 Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng
 <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Benno Lossin <benno.lossin@...ton.me>,
 Andreas Hindborg <a.hindborg@...sung.com>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>,
 Thomas Gleixner <tglx@...utronix.de>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
 Martin Rodriguez Reboredo <yakoyoku@...il.com>
Subject: Re: [PATCH v2 1/4] rust: sync: add `CondVar::notify_sync`

On 16/12/2023 15:31, Alice Ryhl wrote:
> Wake up another thread synchronously.
> 
> This method behaves like `notify_one`, except that it hints to the
> scheduler that the current thread is about to go to sleep, so it should
> schedule the target thread on the same CPU.
> 
> This is used by Rust Binder as a performance optimization. When sending
> a transaction to a different process, we usually know which thread will
> handle it, so we can schedule that thread for execution next on this
> CPU for better cache locality.
> 
> Reviewed-by: Benno Lossin <benno.lossin@...ton.me>
> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

Reviewed-by: Tiago Lam <tiagolam@...il.com>