Hi, please review:
bug 8237750: https://bugs.openjdk.java.net/browse/JDK-8237750
webrev: http://cr.openjdk.java.net/~minqi/8237750/webrev-01/
Summary:
zip library is loaded unconditionally at start up but it is only
needed when
1) bootclasspath contains zip or
2) UseAOT enabled or
3) VerifySharedArchive turned on or
4) CDS archives custom loaded classes
If none of above in java application, it is not necessary to have
zip library loaded.
Solution by loading zip library on demand when needed.
Performance for java -Xint version:
Results of " perf stat -r 50 bin/java -Xshare:on
-XX:SharedArchiveFile=jdk2.jsa -Xint -version "
1: 59611556 59450206 (-161350) ----- 39.799 40.274
( 0.475) ++
2: 59602708 59425234 (-177474) ----- 40.591 41.183
( 0.592) ++
3: 59579718 59441272 (-138446) ---- 40.777 40.471 (
-0.306) -
4: 59584882 59410155 (-174727) ----- 40.824 40.233 (
-0.591) --
5: 59590998 59447252 (-143746) ---- 40.400 40.493
( 0.093)
6: 59589523 59441934 (-147589) ---- 40.475 40.064 (
-0.411) --
7: 59581820 59413612 (-168208) ----- 39.763 40.077
( 0.314) +
8: 59593678 59418738 (-174940) ----- 40.912 39.724 (
-1.188) -----
9: 59573058 59412554 (-160504) ----- 40.126 40.033 (
-0.093)
10: 59591469 59419291 (-172178) ----- 40.731 40.689 (
-0.042)
============================================================
59589940 59428022 (-161917) ----- 40.438 40.322 (
-0.116)
instr delta = -161917 -0.2717%
time delta = -0.116 ms -0.2859%
Tests: hs-tier1-4.
Due to zip library not loaded at default, I removed 'zip' from pmap list
in test case: *test/hotspot/jtreg/serviceability/sa/ClhsdbPmap.java
**
* Thanks
Yumin
