performance.now() should jump after sleep/suspend/hibernation

Version

v18.14.2

Platform

Linux qubit 5.15.108-0-lts #1-Alpine SMP Fri, 21 Apr 2023 05:55:14 +0000 x86_64 GNU/Linux

Subsystem

perf_hooks

What steps will reproduce the bug?

In an interactive node session run:

function timeDelta() {
    // The delta should be approximately the same on each invocation (assuming the system time is unchanged).
    return Date.now() - performance.now();
};
const ref = timeDelta();
const before = timeDelta();

Now suspend and resume the machine / VM through whatever means. Then continue in the same node session:

const after = timeDelta();
console.log('BEFORE:', ref - before, 'AFTER:', ref - after);

Observe that the after value is incorrectly missing a number of seconds that matches the time the system was suspended. Eg. from my run:

BEFORE: -0.410888671875
AFTER: -7346.271728515625

How often does it reproduce? Is there a required condition?

100% (on Linux)

What is the expected behavior? Why is that the expected behavior?

performance.now() is expected to jump with the realtime passed time while suspended according to the spec and https://github.com/w3c/hr-time/issues/115.

The https://github.com/mdn/content/issues/4713 issue also goes into detail on how the "Ticking During Sleep" applies to various platforms.

What do you see instead?

No jump during sleep. Eg. by using more suitable clock reference, as proposed implemented in https://github.com/libuv/libuv/issues/1674.

Additional information

The current performance.now() implementation is based on process.hrtime():

https://github.com/nodejs/node/blob/2ac5e9889aba461f5a54d320973d2574980d206b/lib/internal/perf/utils.js#L13-L16

This issue also seems to contain a lot of relevant context around a concrete problem: https://github.com/open-telemetry/opentelemetry-js/issues/852.

lib/internal/perf/utils.js と perf_hooks の実装から始めます。現在は performance.now() の基準を process.hrtime() にしています。システムのサスペンドまたはレジュームを挟んで、レポートにあるインタラクティブな Node セッションを実行します。Linux 上で、サスペンド中に経過した時間の分だけ performance.now() が進み、期待される timeDelta の挙動も維持されれば完了です。