Re: Proposal for JavaScript Timing Extension to the Performance Timeline

Can't you build this the timing extension, e.g. up on github, purely on top
of window.performance.now()?

On Thu, Feb 16, 2012 at 2:28 AM, Alois Reitbauer <
alois.reitbauer@dynatrace.com> wrote:

>  I do not see a relationship between these two. This is about getting
> actual JavaScript timings via the Performance Timeline while the other one
> reports back the current time in the browser.****
>
> ** **
>
> // Alois****
>
> ** **
>
> *From:* Nat Duca [mailto:nduca@google.com]
> *Sent:* Thursday, February 16, 2012 8:02 AM
> *To:* Alois Reitbauer
> *Cc:* Boris Zbarsky; public-web-perf@w3.org
>
> *Subject:* Re: Proposal for JavaScript Timing Extension to the
> Performance Timeline****
>
> ** **
>
> How does this relate to window.performance.now() that was discussed
> previously?****
>
> ** **
>
> On Wed, Feb 15, 2012 at 8:30 AM, Alois Reitbauer <
> alois.reitbauer@dynatrace.com> wrote:****
>
> The idea is to get the first executing function. This should be enough
> information for monitoring. If even this information cannot be provided at
> least a performance Entry object with an empty name should be created.
>
> // Alois****
>
>
> -----Original Message-----
> From: Boris Zbarsky [mailto:bzbarsky@MIT.EDU]
> Sent: Wednesday, February 15, 2012 5:16 PM
> To: public-web-perf@w3.org
> Subject: Re: Proposal for JavaScript Timing Extension to the Performance
> Timeline
>
> On 2/15/12 5:03 AM, Alois Reitbauer wrote:
> > A while ago, I submitted a list of potential future work targeted at
> > getting more insight into the runtime behavior of JavaScript heavy web
> > applications. As a first result out of these initial ideas I came up
> > with a proposal how to extend the Performance Timeline to expose
> > JavaScript execution time information.
> >
> > As formatting is limited for mailing list messages I posted a
> > formatted and easy to read version of the proposal at
> > http://blog.dynatrace.com/2012/02/15/specification-proposal-for-javasc
> > ript-timing-in-browsers/
> >
> > Please provide feedback.
>
> When this feature is enabled, what should be reported for function
> execution times in a JIT compiler which inlines functions and then does
> common subexpression elimination and constant-folding on the resulting
> code, effectively across function boundaries?
>
>
> Of course one could disable such optimizations when the timeline is on,
> but that would materially change the performance characteristics of the
> script in the cases of interest....
>
> -Boris
>
>
>
> ****
>
> ** **
>