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src/share/vm/gc_implementation/g1/g1_specialized_oop_closures.hpp@e7d0505c8a30
src/share/vm/gc_implementation/g1/g1_specialized_oop_closures.hpp
Fri, 10 Oct 2014 15:51:58 +0200
- author
- tschatzl
- date
- Fri, 10 Oct 2014 15:51:58 +0200
- changeset 7257
- e7d0505c8a30
- parent 6992
- 2c6ef90f030a
- child 7535
- 7ae4e26cb1e0
- permissions
- -rw-r--r--
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
1 /*
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1_SPECIALIZED_OOP_CLOSURES_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1_SPECIALIZED_OOP_CLOSURES_HPP
28 // The following OopClosure types get specialized versions of
29 // "oop_oop_iterate" that invoke the closures' do_oop methods
30 // non-virtually, using a mechanism defined in this file. Extend these
31 // macros in the obvious way to add specializations for new closures.
33 enum G1Barrier {
34 G1BarrierNone,
35 G1BarrierEvac,
36 G1BarrierKlass
37 };
39 enum G1Mark {
40 G1MarkNone,
41 G1MarkFromRoot,
42 G1MarkPromotedFromRoot
43 };
45 // Forward declarations.
47 template<G1Barrier barrier, G1Mark do_mark_object>
48 class G1ParCopyClosure;
50 class G1ParScanClosure;
51 class G1ParPushHeapRSClosure;
53 class FilterIntoCSClosure;
54 class FilterOutOfRegionClosure;
55 class G1CMOopClosure;
56 class G1RootRegionScanClosure;
58 // Specialized oop closures from g1RemSet.cpp
59 class G1Mux2Closure;
60 class G1TriggerClosure;
61 class G1InvokeIfNotTriggeredClosure;
62 class G1UpdateRSOrPushRefOopClosure;
64 #ifdef FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES
65 #error "FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES already defined."
66 #endif
68 #define FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES(f) \
69 f(G1ParScanClosure,_nv) \
70 f(G1ParPushHeapRSClosure,_nv) \
71 f(FilterIntoCSClosure,_nv) \
72 f(FilterOutOfRegionClosure,_nv) \
73 f(G1CMOopClosure,_nv) \
74 f(G1RootRegionScanClosure,_nv) \
75 f(G1Mux2Closure,_nv) \
76 f(G1TriggerClosure,_nv) \
77 f(G1InvokeIfNotTriggeredClosure,_nv) \
78 f(G1UpdateRSOrPushRefOopClosure,_nv)
80 #ifdef FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES
81 #error "FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES already defined."
82 #endif
84 #define FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(f)
86 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_SPECIALIZED_OOP_CLOSURES_HPP
