linux-kernel - Re: [PATCH v2 2/4] rust: time: add msecs to jiffies conversion

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Message-ID: <b9a3193d-e020-4691-b8d9-4dce09fe2cd4@gmail.com>
Date: Mon, 18 Dec 2023 08:32:26 +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
Subject: Re: [PATCH v2 2/4] rust: time: add msecs to jiffies conversion

On 16/12/2023 15:31, Alice Ryhl wrote:
> Defines type aliases and conversions for msecs and jiffies.
> 
> This is used by Rust Binder for process freezing. There, we want to
> sleep until the freeze operation completes, but we want to be able to
> abort the process freezing if it doesn't complete within some timeout.
> The freeze timeout is supplied in msecs.
> 
> Note that we need to convert to jiffies in Binder. It is not enough to
> introduce a variant of `CondVar::wait_timeout` that takes the timeout in
> msecs because we need to be able to restart the sleep with the remaining
> sleep duration if it is interrupted, and if the API takes msecs rather
> than jiffies, then that would require a conversion roundtrip jiffies->
> msecs->jiffies that is best avoided.
> 
> Suggested-by: Boqun Feng <boqun.feng@...il.com>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

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