1495431 - Expose baseline and ion JIT warm up threshold options to preferences, about:config

Status: RESOLVED FIXED

(Core :: JavaScript Engine: JIT, enhancement)

Description

[Andrew Creskey [:acreskey]]

There are currently jit::JitOptions for tuning both the baseline and the ion warm up thresholds exposed through JSAPI.

This bug captures the work of exposing these options to the "about:config" preferences for easy tuning.

The ion JitOption, frequentBailoutThreshold, should also be exposed to JSAPI and Preferences.

Comment 1

[Nicolas B. Pierron [:nbp] {away}]

They are already present, except that they are not exposed by default in about:config, see:

https://searchfox.org/mozilla-central/rev/819cd31a93fd50b7167979607371878c4d6f18e8/js/xpconnect/src/XPCJSContext.cpp#820-821,899-902

In about:config, you should be able to add new entries for:
  javascript.options.ion.threshold
  javascript.options.baseline.threshold

Comment 2

[Andrew Creskey [:acreskey]]

Attachment: Bug 1495431 Expose baseline and ion JIT warm up threshold options to preferences, about:config

JIT warmup options were exposed to preferences to facilitate experimentation/optimization.

The baseline and ion warm up thresholds had already been exposed through JSAPI, just needed to read from Preferences.

The ion JitOption, frequentBailoutThreshold, was also exposed to JSAPI and Preferences.

Comment 3

[Nicolas B. Pierron [:nbp] {away}]

Comment on attachment 9013383 [details]
Bug 1495431 Expose baseline and ion JIT warm up threshold options to preferences, about:config

Nicolas B. Pierron [:nbp] has approved the revision.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/01634947caab
Expose baseline and ion JIT warm up threshold options to preferences, about:config r=nbp

Comment 5

[Narcis Beleuzu [:NarcisB]]

https://hg.mozilla.org/mozilla-central/rev/01634947caab