8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
Reviewed-by: pliden, stefank, eosterlund, ehelin, sjohanss, rbackman, coleenp, ihse, jgeorge, lmesnik, rkennke
Contributed-by: per.liden@oracle.com, stefan.karlsson@oracle.com, erik.osterlund@oracle.com, mikael.gerdin@oracle.com, kim.barrett@oracle.com, nils.eliasson@oracle.com, rickard.backman@oracle.com, rwestrel@redhat.com, coleen.phillimore@oracle.com, robbin.ehn@oracle.com, gerard.ziemski@oracle.com, hugh.wilkinson@intel.com, sandhya.viswanathan@intel.com, bill.npo.wheeler@intel.com, vinay.k.awasthi@intel.com, yasuenag@gmail.com
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*
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#ifndef SHARE_GC_Z_Z_GLOBALS_HPP
#define SHARE_GC_Z_Z_GLOBALS_HPP
#define GC_Z_FLAGS(develop, \
develop_pd, \
product, \
product_pd, \
diagnostic, \
diagnostic_pd, \
experimental, \
notproduct, \
manageable, \
product_rw, \
lp64_product, \
range, \
constraint, \
writeable) \
\
product(ccstr, ZPath, NULL, \
"Filesystem path for Java heap backing storage " \
"(must be a tmpfs or a hugetlbfs filesystem)") \
\
product(double, ZAllocationSpikeTolerance, 2.0, \
"Allocation spike tolerance factor") \
\
product(double, ZFragmentationLimit, 25.0, \
"Maximum allowed heap fragmentation") \
\
product(bool, ZStallOnOutOfMemory, true, \
"Allow Java threads to stall and wait for GC to complete " \
"instead of immediately throwing an OutOfMemoryError") \
\
product(size_t, ZMarkStacksMax, NOT_LP64(512*M) LP64_ONLY(8*G), \
"Maximum number of bytes allocated for marking stacks") \
range(32*M, NOT_LP64(512*M) LP64_ONLY(1024*G)) \
\
product(uint, ZCollectionInterval, 0, \
"Force GC at a fixed time interval (in seconds)") \
\
product(uint, ZStatisticsInterval, 10, \
"Time between statistics print outs (in seconds)") \
range(1, (uint)-1) \
\
diagnostic(bool, ZStatisticsForceTrace, false, \
"Force tracing of ZStats") \
\
diagnostic(bool, ZProactive, true, \
"Enable proactive GC cycles") \
\
diagnostic(bool, ZUnmapBadViews, false, \
"Unmap bad (inactive) heap views") \
\
diagnostic(bool, ZVerifyMarking, false, \
"Verify marking stacks") \
\
diagnostic(bool, ZVerifyForwarding, false, \
"Verify forwarding tables") \
\
diagnostic(bool, ZSymbolTableUnloading, false, \
"Unload unused VM symbols") \
\
diagnostic(bool, ZWeakRoots, true, \
"Treat JNI WeakGlobalRefs and StringTable as weak roots") \
\
diagnostic(bool, ZConcurrentStringTable, true, \
"Clean StringTable concurrently") \
\
diagnostic(bool, ZConcurrentVMWeakHandles, true, \
"Clean VM WeakHandles concurrently") \
\
diagnostic(bool, ZConcurrentJNIWeakGlobalHandles, true, \
"Clean JNI WeakGlobalRefs concurrently") \
\
diagnostic(bool, ZOptimizeLoadBarriers, true, \
"Apply load barrier optimizations") \
\
develop(bool, ZVerifyLoadBarriers, false, \
"Verify that reference loads are followed by barriers")
#endif // SHARE_GC_Z_Z_GLOBALS_HPP