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6672698: mangle_unused_area() should not remangle the entire heap at each collection

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Maintain a high water mark for the allocations in a space and mangle only up to that high water mark.

Reviewed-by: ysr, apetrusenko
This commit is contained in:
Jon Masamitsu 2008-07-09 15:08:55 -07:00
parent 0d9452401c
commit 18dbebd143
43 changed files with 1299 additions and 206 deletions
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8
hotspot/src/share/vm/runtime/globals.hpp
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@ -589,9 +589,15 @@ class CommandLineFlags {
develop(bool, ZapJNIHandleArea, trueInDebug, \
"Zap freed JNI handle space with 0xFEFEFEFE") \
\
develop(bool, ZapUnusedHeapArea, false, \
develop(bool, ZapUnusedHeapArea, trueInDebug, \
"Zap unused heap space with 0xBAADBABE") \
\
develop(bool, TraceZapUnusedHeapArea, false, \
"Trace zapping of unused heap space") \
\
develop(bool, CheckZapUnusedHeapArea, false, \
"Check zapping of unused heap space") \
\
develop(bool, PrintVMMessages, true, \
"Print vm messages on console") \
\