Karen, Keith,
I add several new perf counters to collect time spent in various aspects
about class loading.
Webrev:
http://cr.openjdk.java.net/~mchung/6857194/webrev.00/Changes:
1. Counters to collect the time spent in defineClass and the byte size
read.
2. Counters to collect the number of bytes read when parsing a class
file stream.
The existing sun.cls.loadedBytes and sharedLoadedBytes counter (in
classLoadingService.cpp - that was carried from 1.4.2) represent the
footprint of a instanceKlass. The new counters measure the numbers of
bytes in the classfile read.
3. Existing class init, class link, and class verify counters include
the class loading and resolution. I add the counters to measure the
exclusive time (i.e. self time) as well.
I ran startup3 on Windows XP. No significant overhead.
==============================================================================
mchung.baseline:
Benchmark Samples Mean Stdev Geomean
Weight
startup3 15 2.36 0.04
==============================================================================
mchung.hsfix:
Benchmark Samples Mean Stdev %Diff P
Significant
startup3 15 2.35 0.05 0.24
0.714 *
==============================================================================
Thanks
Mandy
