[webkit-dev] Feedback on the performance.measureMemory API proposal

Ulan Degenbaev ulan at google.com
Mon Dec 14 14:03:49 PST 2020

In the meantime we have a spec draft:
There is a pending change [1] to restrict the scope of the API to the
current process (i.e. the current address space).

Could you please take a look and give Webkit's position on the API?

Thank you,

[1]: https://github.com/WICG/performance-measure-memory/pull/23

On Thu, Apr 2, 2020 at 2:17 PM Ulan Degenbaev <ulan at google.com> wrote:

> Hello webkit-dev,
> I'd like to solicit feedback as well as an official position from Webkit on
> our proposal for the new memory measurement API:
> https://github.com/WICG/performance-measure-memory
> The proposal generalizes the previous performance-memory proposal [1] that
> was abandoned [2] due to information leak of cross-origin resources. The
> new API addresses the information leak and process model issues raised in
> the previous feedback [3].
> What is different in the new API?
> - It relies on COOP+COEP [4] for preventing cross-origin information leaks
> (see "Security Considerations"). Besides security, COOP+COEP also helps
> implementability because the browser needs to isolate the web page from
> other web pages.
> - It does not assume any particular process model and is defined using the
> standard concepts such as JS agent cluster and browsing context group.
> - It has an extensible and generic interface for breaking down memory
> usage by type (JS, DOM, GPU) and owner. Implementers can choose the level
> of detail they are willing to provide based on their performance trade-offs
> (see "Performance Considerations").
> Thank you,
> Ulan.
> [1]: The previous proposal:
> https://github.com/WICG/performance-memory/blob/master/explainer.md
> [2]: Information leak affecting the previous proposal:
> https://github.com/mozilla/standards-positions/issues/85#issuecomment-426382208
> [3]: Feedback from Apple on the previous proposal:
> https://github.com/WICG/performance-memory/issues/14
> [4]: COOP and COEP explained:
> https://docs.google.com/document/d/1zDlfvfTJ_9e8Jdc8ehuV4zMEu9ySMCiTGMS9y0GU92k/edit
> Other Relevant Links
> Explainer: https://github.com/WICG/performance-measure-memory
> Open issues: https://github.com/WICG/performance-measure-memory/issues
> WebPerf WG F2F June 2019 presentation (for older iteration of the API):
> https://docs.google.com/document/d/1uQ7pXwuBv-1jitYou7TALJxV0tllXLxTyEjA2n1mSzY/edit#heading=h.x0ih8vnl6qwo
> TAG design review (for older iteration of the API):
> https://github.com/w3ctag/design-reviews/issues/386
> Issue on Mozilla standards-positions:
> https://github.com/mozilla/standards-positions/issues/281
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