Bug 84476

Summary: JSGarbageCollect should not call collectAllGarbage()
Product: WebKit Reporter: Mark Hahnenberg <mhahnenberg>
Component: JavaScriptCoreAssignee: Mark Hahnenberg <mhahnenberg>
Status: RESOLVED FIXED    
Severity: Normal    
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Patch ggaren: review+

Description Mark Hahnenberg 2012-04-20 12:09:18 PDT 
JSGarbageCollect should not synchronously call collectAllGarbage(). Instead, it should notify the GCActivityCallback that it has abandoned an object graph, which will set the timer to run at some point in the future that JSC can decide according to its own policies.
Comment 1 Mark Hahnenberg 2012-04-20 12:11:25 PDT 
Created attachment 138139 [details]
Patch
Comment 2 Geoffrey Garen 2012-04-20 12:17:14 PDT 
Comment on attachment 138139 [details]
Patch

Let's fix the FIXME by taking advantage of our new callback, like so:

- Cancel the GC timer at the start of collection (rename didCollect to willCollect)
- If collection causes a didAbandonObjectGraph, it can now start the timer, which will, in fact, cause another collection later.

In the same patch, you can remove the isBusy() check, since didAbandonObjectGraph is safe to call while the heap is busy.
Comment 3 Mark Hahnenberg 2012-04-20 12:36:28 PDT 
Committed r114771: <http://trac.webkit.org/changeset/114771>