Bug 89940

Summary: JSC should try to make profiling deterministic because otherwise reproducing failures is nearly impossible
Product: WebKit Reporter: Filip Pizlo <fpizlo>
Component: JavaScriptCoreAssignee: Filip Pizlo <fpizlo>
Status: RESOLVED FIXED    
Severity: Normal    
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: All   
OS: All   
Bug Depends on: 89802    
Bug Blocks:    

Filip Pizlo
Reported 2012-06-25 19:49:42 PDT
We should in future do more exploration of the stochastic profiling from https://bugs.webkit.org/show_bug.cgi?id=89802. But without some sort of record-replay mode, this sort of randomness greatly increases the work required to narrow in on compiler bugs. This bug is concerned with just removing the random part of http://trac.webkit.org/changeset/121215. It still leaves the ability to periodically compute least-upper-bounds of value profiles by setting an artificially low execution count threshold.
Attachments
Add attachment proposed patch, testcase, etc.
Filip Pizlo
Comment 1 2012-06-25 19:50:31 PDT
Rubber-stamped in person by Gavin Barraclough.
Filip Pizlo
Comment 2 2012-06-25 19:54:16 PDT
Landed in http://trac.webkit.org/changeset/121218
Note You need to log in before you can comment on or make changes to this bug.