EVALUATION

ChangeSet=http://hg.openjdk.java.net/jdk7/hotspot-rt/hotspot/rev/e392695de029,ChangeRequest=6935224
                                     

SUGGESTED FIX

The first step to improve the hotspot provider consists of:
   - adding probes related to thread scheduling (sleep, yield, park/unpark)
   - adding probes related to class initialization
   - adding support for dynamic activation of the monitor related probes
     (without activating the method/allocations probes which cause a big
     performance overhead) 
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EVALUATION

Palantir is a tool designed to analyze the behavior of multithreaded
applications. Data collection is performed with DTrace scripts. The
current DTrace instrumentation of HotSpot suffers from two main issues.
The first one is the lack of instrumentation of some areas of the 
virtual machine. The second issue is the significant overhead caused
by some probes (object allocations and method invocation).

The goal of this work is to improve the current hotspot DTrace provider
to provide more data to the Palantir tool while preserving a low
overhead.

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