Mon, 11 Oct 2010 04:18:58 -0700
6829194: JSR 292 needs to support compressed oops
Reviewed-by: kvn, jrose
1 /*
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25 // Sets the default values for platform dependent flags used by the runtime system.
26 // (see globals.hpp)
28 // For sparc we do not do call backs when a thread is in the interpreter, because the
29 // interpreter dispatch needs at least two instructions - first to load the dispatch address
30 // in a register, and second to jmp. The swapping of the dispatch table may occur _after_
31 // the load of the dispatch address and hence the jmp would still go to the location
32 // according to the prior table. So, we let the thread continue and let it block by itself.
33 define_pd_global(bool, DontYieldALot, true); // yield no more than 100 times per second
34 define_pd_global(bool, ConvertSleepToYield, false); // do not convert sleep(0) to yield. Helps GUI
35 define_pd_global(bool, ShareVtableStubs, false); // improves performance markedly for mtrt and compress
36 define_pd_global(bool, CountInterpCalls, false); // not implemented in the interpreter
37 define_pd_global(bool, NeedsDeoptSuspend, true); // register window machines need this
39 define_pd_global(bool, ImplicitNullChecks, true); // Generate code for implicit null checks
40 define_pd_global(bool, UncommonNullCast, true); // Uncommon-trap NULLs past to check cast
42 define_pd_global(intx, CodeEntryAlignment, 32);
43 // The default setting 16/16 seems to work best.
44 // (For _228_jack 16/16 is 2% better than 4/4, 16/4, 32/32, 32/16, or 16/32.)
45 define_pd_global(intx, OptoLoopAlignment, 16); // = 4*wordSize
46 define_pd_global(intx, InlineFrequencyCount, 50); // we can use more inlining on the SPARC
47 define_pd_global(intx, InlineSmallCode, 1500);
48 #ifdef _LP64
49 // Stack slots are 2X larger in LP64 than in the 32 bit VM.
50 define_pd_global(intx, ThreadStackSize, 1024);
51 define_pd_global(intx, VMThreadStackSize, 1024);
52 #else
53 define_pd_global(intx, ThreadStackSize, 512);
54 define_pd_global(intx, VMThreadStackSize, 512);
55 #endif
57 define_pd_global(intx, StackYellowPages, 2);
58 define_pd_global(intx, StackRedPages, 1);
59 define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1));
61 define_pd_global(intx, PreInflateSpin, 40); // Determined by running design center
63 define_pd_global(bool, RewriteBytecodes, true);
64 define_pd_global(bool, RewriteFrequentPairs, true);