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6786503: Overflow list performance can be improved

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Avoid overflow list walk in CMS & ParNew when it is unnecessary. Fix a couple of correctness issues, including a C-heap leak, in ParNew at the intersection of promotion failure, work queue overflow and object array chunking. Add stress testing option and related assertion checking.

Reviewed-by: jmasa
This commit is contained in:
Y. Srinivas Ramakrishna 2009-01-26 12:47:21 -08:00
parent 8109aa4a16
commit f031c45430
7 changed files with 294 additions and 78 deletions
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15
hotspot/src/share/vm/runtime/globals.hpp
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@ -1307,7 +1307,14 @@ class CommandLineFlags {
product(intx, ParGCArrayScanChunk, 50, \
"Scan a subset and push remainder, if array is bigger than this") \
\
product(intx, ParGCDesiredObjsFromOverflowList, 20, \
notproduct(bool, ParGCWorkQueueOverflowALot, false, \
"Whether we should simulate work queue overflow in ParNew") \
\
notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
"An `interval' counter that determines how frequently" \
" we simulate overflow; a smaller number increases frequency") \
\
product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
"The desired number of objects to claim from the overflow list") \
\
product(uintx, CMSParPromoteBlocksToClaim, 50, \
@ -1429,8 +1436,8 @@ class CommandLineFlags {
"Whether we should simulate frequent marking stack / work queue" \
" overflow") \
\
notproduct(intx, CMSMarkStackOverflowInterval, 1000, \
"A per-thread `interval' counter that determines how frequently" \
notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
"An `interval' counter that determines how frequently" \
" we simulate overflow; a smaller number increases frequency") \
\
product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
@ -1648,7 +1655,7 @@ class CommandLineFlags {
develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \
"Number of yields before a sleep is done during workstealing") \
\
product(uintx, PreserveMarkStackSize, 40, \
product(uintx, PreserveMarkStackSize, 1024, \
"Size for stack used in promotion failure handling") \
\
product_pd(bool, UseTLAB, "Use thread-local object allocation") \