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6634032: CMS: Need CMSInitiatingPermOccupancyFraction for perm, divorcing from CMSInitiatingOccupancyFraction

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The option CMSInitiatingPermOccupancyFraction now controls perm triggering threshold. Even though the actual value of the threshold has not yet been changed, so there is no change in policy, we now have the infrastructure in place for dynamically deciding when to collect the perm gen, an issue that will be addressed in the near future.

Reviewed-by: jmasa
This commit is contained in:
Y. Srinivas Ramakrishna 2008-03-16 21:57:25 -07:00
parent 3bf59e9c0a
commit f2b6ac989e
4 changed files with 198 additions and 109 deletions
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21
hotspot/src/share/vm/runtime/globals.hpp
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@ -1319,6 +1319,10 @@ class CommandLineFlags {
product(bool, CMSClassUnloadingEnabled, false, \
"Whether class unloading enabled when using CMS GC") \
\
product(uintx, CMSClassUnloadingMaxInterval, 0, \
"When CMS class unloading is enabled, the maximum CMS cycle count"\
" for which classes may not be unloaded") \
\
product(bool, CMSCompactWhenClearAllSoftRefs, true, \
"Compact when asked to collect CMS gen with clear_all_soft_refs") \
\
@ -1504,17 +1508,30 @@ class CommandLineFlags {
"Percentage of MinHeapFreeRatio in CMS generation that is " \
" allocated before a CMS collection cycle commences") \
\
product(intx, CMSBootstrapOccupancy, 50, \
product(intx, CMSTriggerPermRatio, 80, \
"Percentage of MinHeapFreeRatio in the CMS perm generation that" \
" is allocated before a CMS collection cycle commences, that " \
" also collects the perm generation") \
\
product(uintx, CMSBootstrapOccupancy, 50, \
"Percentage CMS generation occupancy at which to " \
" initiate CMS collection for bootstrapping collection stats") \
\
product(intx, CMSInitiatingOccupancyFraction, -1, \
"Percentage CMS generation occupancy to start a CMS collection " \
" cycle (A negative value means that CMSTirggerRatio is used)") \
" cycle (A negative value means that CMSTriggerRatio is used)") \
\
product(intx, CMSInitiatingPermOccupancyFraction, -1, \
"Percentage CMS perm generation occupancy to start a CMScollection"\
" cycle (A negative value means that CMSTriggerPermRatio is used)")\
\
product(bool, UseCMSInitiatingOccupancyOnly, false, \
"Only use occupancy as a crierion for starting a CMS collection") \
\
product(intx, CMSIsTooFullPercentage, 98, \
"An absolute ceiling above which CMS will always consider the" \
" perm gen ripe for collection") \
\
develop(bool, CMSTestInFreeList, false, \
"Check if the coalesced range is already in the " \
"free lists as claimed.") \