Request for review (S) 6588413: Use -fvisibility=hidden for gcc compiles (original) (raw)
Coleen Phillimore coleen.phillimore at oracle.com
Fri Jan 21 08:57:09 PST 2011
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Summary: Add option for gcc 4 and above, define JNIEXPORT and JNIIMPORT to visibility=default, add for jio_snprintf and others since -fvisibility=hidden overrides --version-script definitions.
Performance increases measured by Volker and Tom;
5% (JBB2005) and 2% (JVM98) on Linux/IA64 and 1,5% (JBB2005) and 0,5% (JVM98) on Linux/PPC64
on intel hardware:
specjvm98 15 314.61 0.00 0.33 0.006 Yes javac 15 248.88 0.01 1.72 0.000 Yes jack 15 294.44 0.01 1.38 0.000 Yes
open webrev at http://cr.openjdk.java.net/~coleenp/6588413/ bug link at http://bugs.sun.com/view_bug.do?bug_id=6588413
Tested with jmap for any serviceability impact, and tested hs_err_file decoding still works.
Thanks, Coleen
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