linux-kernel - Re: [PATCH 2/2] rust: sync: add `CondVar::wait

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Date:   Wed, 6 Dec 2023 17:42:29 +0100
From:   Alice Ryhl <aliceryhl@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Boqun Feng <boqun.feng@...il.com>, Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...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>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] rust: sync: add `CondVar::wait_timeout`

On Wed, Dec 6, 2023 at 5:39 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Wed, Dec 06, 2023 at 08:30:06AM -0800, Boqun Feng wrote:
> > On Wed, Dec 06, 2023 at 10:09:24AM +0000, Alice Ryhl wrote:
> > [...]
> > > +
> > > +/// The return type of `wait_timeout`.
> > > +pub enum CondVarTimeoutResult {
> > > +    /// The timeout was reached.
> > > +    Timeout,
> > > +    /// Somebody woke us up.
> > > +    Woken {
> > > +        /// Remaining sleep duration.
> > > +        jiffies: u64,
> >
> > I have a Jiffies definition in the my upcoming timer patchset:
> >
> > /// The time unit of Linux kernel. One jiffy equals (1/HZ) second.
> > pub type Jiffies = core::ffi::c_ulong;
> >
> > Maybe you can add that (in a separate patch) in kernel::time?
>
> Urgh, why are we using jiffies in 2023?

I assumed that the correct thing here would be to accept the same unit
as what schedule_timeout takes. Should I be doing something else?

Alice