Bug 80055 – JIT heuristics should be hyperbolic

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Filip Pizlo]

The less memory we have, the more we should wait to tier up.  This should further reduce the likelihood that we'll ever run out of executable memory, while also ensuring that when running an app that has a ton of code, we end up optimizing the things that are really the most important.

<rdar://problem/10922260>

[Filip Pizlo]

Created attachment 129756 [details]
work in progress

[Filip Pizlo]

Created attachment 129758 [details]
work in progress

[Filip Pizlo]

Created attachment 130019 [details]
the patch

[Early Warning System Bot]

Comment on attachment 130019 [details]
the patch

Attachment 130019 [details] did not pass qt-ews (qt):
Output: http://queues.webkit.org/results/11807369

[Build Bot]

Comment on attachment 130019 [details]
the patch

Attachment 130019 [details] did not pass win-ews (win):
Output: http://queues.webkit.org/results/11803596

[Filip Pizlo]

Created attachment 130020 [details]
the patch

Ooops, forgot to fix up all of the build systems.

[Early Warning System Bot]

Comment on attachment 130020 [details]
the patch

Attachment 130020 [details] did not pass qt-ews (qt):
Output: http://queues.webkit.org/results/11801569

[Filip Pizlo]

Created attachment 130021 [details]
the patch

Trying again to fix Qt.

[WebKit Review Bot]

Comment on attachment 130021 [details]
the patch

Attachment 130021 [details] did not pass chromium-ews (chromium-xvfb):
Output: http://queues.webkit.org/results/11802597

New failing tests:
editing/selection/select-line-break-with-opposite-directionality.html

[Filip Pizlo]

Landed in http://trac.webkit.org/changeset/109705

[Patrick R. Gansterer]

(In reply to comment #10)
> Landed in http://trac.webkit.org/changeset/109705

Patch broke WinCE bot, which is the only one with JIT turned off.

1>ExecutionCounter.cpp
1>..\..\..\..\Source\JavaScriptCore\bytecode\ExecutionCounter.cpp(68) : error C2653: 'ExecutableAllocator' : is not a class or namespace name
1>..\..\..\..\Source\JavaScriptCore\bytecode\ExecutionCounter.cpp(68) : error C3861: 'memoryPressureMultiplier': identifier not found

Can fix it, or at least tell me what's the correct way to fix it?


If there is any interrest in maintaing the !ENABLE(JIT) build, it would be nice to watch the WinCE bot too. :-)

[Filip Pizlo]

(In reply to comment #11)
> (In reply to comment #10)
> > Landed in http://trac.webkit.org/changeset/109705
> 
> Patch broke WinCE bot, which is the only one with JIT turned off.
> 
> 1>ExecutionCounter.cpp
> 1>..\..\..\..\Source\JavaScriptCore\bytecode\ExecutionCounter.cpp(68) : error C2653: 'ExecutableAllocator' : is not a class or namespace name
> 1>..\..\..\..\Source\JavaScriptCore\bytecode\ExecutionCounter.cpp(68) : error C3861: 'memoryPressureMultiplier': identifier not found
> 
> Can fix it, or at least tell me what's the correct way to fix it?
> 
> 
> If there is any interrest in maintaing the !ENABLE(JIT) build, it would be nice to watch the WinCE bot too. :-)

Oh noes!  Sorry about that!  The right fix is to place #if ENABLE(JIT) around ExecutionCounter.h and ExecutionCounter.cpp.  Hopefully that will be sufficient.

If you don't get around to it in the next half hour, I'll do it when I get to the office.

[Patrick R. Gansterer]

Landed fix for !ENABLE(JIT) in http://trac.webkit.org/changeset/109784

[Patrick R. Gansterer]

(In reply to comment #13)
> Landed fix for !ENABLE(JIT) in http://trac.webkit.org/changeset/109784

Simple adding #if ENABLE(JIT) isn't sufficent, since it's used in CodeBlock.h. IMHO there are some additional ifdefs required. Can you take care of this problem? Otherwise I need to digg deeper into the code, to place the ifdefs correctly.

[Filip Pizlo]

(In reply to comment #14)
> (In reply to comment #13)
> > Landed fix for !ENABLE(JIT) in http://trac.webkit.org/changeset/109784
> 
> Simple adding #if ENABLE(JIT) isn't sufficent, since it's used in CodeBlock.h. IMHO there are some additional ifdefs required. Can you take care of this problem? Otherwise I need to digg deeper into the code, to place the ifdefs correctly.

Yes, I'll take a look.

[Filip Pizlo]

Build fix landed in http://trac.webkit.org/changeset/109802