linux-kernel - Re: [PATCH] rust: time: New module for timekeeping functions

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Message-ID: <CANiq72kyULg=rPzK3QDqCJny3zjrOKzrH=v2PCTY_pUae-ODgw@mail.gmail.com>
Date:   Wed, 22 Feb 2023 13:29:29 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Asahi Lina <lina@...hilina.net>
Cc:     Boqun Feng <boqun.feng@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        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>,
        John Stultz <jstultz@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org,
        rust-for-linux@...r.kernel.org, asahi@...ts.linux.dev,
        Heghedus Razvan <heghedus.razvan@...tonmail.com>
Subject: Re: [PATCH] rust: time: New module for timekeeping functions

On Wed, Feb 22, 2023 at 5:46 AM Asahi Lina <lina@...hilina.net> wrote:
>
> For the actual Instant type, I was thinking it makes sense to just
> internally represent it as a newtype of Duration as well. Then all the
> math becomes trivial based on Duration operations, and when we replace
> Duration with a new u64 type it'll all work out the same. Fundamentally
> that means Instant types are internally stored as the Duration between
> the epoch (e.g. system boot) subject to the way that clock ticks, which
> I think is a reasonable internal representation?

Yeah, I think that is the way to go -- that is also how C++ represents
time points as well (including libstdc++, libc++ and STL from a quick
look), as well as Abseil too.

Cheers,
Miguel