Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/asPSOldGen.cpp @ 1829:fe08403130db
6979458: VM crashes when -XX:ObjectAlignmentInBytes is too big
Summary: Set upper limit 256 for ObjectAlignmentInBytes value.
Reviewed-by: never, iveresov
author | kvn |
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date | Tue, 05 Oct 2010 08:57:20 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_asPSOldGen.cpp.incl" | |
27 | |
28 // Whereas PSOldGen takes the maximum size of the generation | |
29 // (which doesn't change in the case of PSOldGen) as a parameter, | |
30 // ASPSOldGen takes the upper limit on the size of | |
31 // the generation as a parameter. In ASPSOldGen the | |
32 // maximum size of the generation can change as the boundary | |
33 // moves. The "maximum size of the generation" is still a valid | |
34 // concept since the generation can grow and shrink within that | |
35 // maximum. There are lots of useful checks that use that | |
36 // maximum. In PSOldGen the method max_gen_size() returns | |
37 // _max_gen_size (as set by the PSOldGen constructor). This | |
38 // is how it always worked. In ASPSOldGen max_gen_size() | |
39 // returned the size of the reserved space for the generation. | |
40 // That can change as the boundary moves. Below the limit of | |
41 // the size of the generation is passed to the PSOldGen constructor | |
42 // for "_max_gen_size" (have to pass something) but it is not used later. | |
43 // | |
44 ASPSOldGen::ASPSOldGen(size_t initial_size, | |
45 size_t min_size, | |
46 size_t size_limit, | |
47 const char* gen_name, | |
48 int level) : | |
49 PSOldGen(initial_size, min_size, size_limit, gen_name, level), | |
50 _gen_size_limit(size_limit) | |
51 | |
52 {} | |
53 | |
54 ASPSOldGen::ASPSOldGen(PSVirtualSpace* vs, | |
55 size_t initial_size, | |
56 size_t min_size, | |
57 size_t size_limit, | |
58 const char* gen_name, | |
59 int level) : | |
60 PSOldGen(initial_size, min_size, size_limit, gen_name, level), | |
61 _gen_size_limit(size_limit) | |
62 | |
63 { | |
64 _virtual_space = vs; | |
65 } | |
66 | |
67 void ASPSOldGen::reset_after_change() { | |
68 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
69 (HeapWord*)virtual_space()->high_boundary()); | |
70 post_resize(); | |
71 } | |
72 | |
73 | |
74 size_t ASPSOldGen::available_for_expansion() { | |
75 assert(virtual_space()->is_aligned(gen_size_limit()), "not aligned"); | |
76 assert(gen_size_limit() >= virtual_space()->committed_size(), "bad gen size"); | |
77 | |
78 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
79 size_t result = gen_size_limit() - virtual_space()->committed_size(); | |
80 size_t result_aligned = align_size_down(result, heap->old_gen_alignment()); | |
81 return result_aligned; | |
82 } | |
83 | |
84 size_t ASPSOldGen::available_for_contraction() { | |
85 size_t uncommitted_bytes = virtual_space()->uncommitted_size(); | |
86 if (uncommitted_bytes != 0) { | |
87 return uncommitted_bytes; | |
88 } | |
89 | |
90 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
91 const size_t gen_alignment = heap->old_gen_alignment(); | |
92 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
93 const size_t working_size = | |
94 used_in_bytes() + (size_t) policy->avg_promoted()->padded_average(); | |
95 const size_t working_aligned = align_size_up(working_size, gen_alignment); | |
96 const size_t working_or_min = MAX2(working_aligned, min_gen_size()); | |
97 if (working_or_min > reserved().byte_size()) { | |
98 // If the used or minimum gen size (aligned up) is greater | |
99 // than the total reserved size, then the space available | |
100 // for contraction should (after proper alignment) be 0 | |
101 return 0; | |
102 } | |
103 const size_t max_contraction = | |
104 reserved().byte_size() - working_or_min; | |
105 | |
106 // Use the "increment" fraction instead of the "decrement" fraction | |
107 // to allow the other gen to expand more aggressively. The | |
108 // "decrement" fraction is conservative because its intent is to | |
109 // only reduce the footprint. | |
110 | |
111 size_t result = policy->promo_increment_aligned_down(max_contraction); | |
112 // Also adjust for inter-generational alignment | |
113 size_t result_aligned = align_size_down(result, gen_alignment); | |
114 if (PrintAdaptiveSizePolicy && Verbose) { | |
115 gclog_or_tty->print_cr("\nASPSOldGen::available_for_contraction:" | |
116 " %d K / 0x%x", result_aligned/K, result_aligned); | |
117 gclog_or_tty->print_cr(" reserved().byte_size() %d K / 0x%x ", | |
118 reserved().byte_size()/K, reserved().byte_size()); | |
119 size_t working_promoted = (size_t) policy->avg_promoted()->padded_average(); | |
120 gclog_or_tty->print_cr(" padded promoted %d K / 0x%x", | |
121 working_promoted/K, working_promoted); | |
122 gclog_or_tty->print_cr(" used %d K / 0x%x", | |
123 used_in_bytes()/K, used_in_bytes()); | |
124 gclog_or_tty->print_cr(" min_gen_size() %d K / 0x%x", | |
125 min_gen_size()/K, min_gen_size()); | |
126 gclog_or_tty->print_cr(" max_contraction %d K / 0x%x", | |
127 max_contraction/K, max_contraction); | |
128 gclog_or_tty->print_cr(" without alignment %d K / 0x%x", | |
129 policy->promo_increment(max_contraction)/K, | |
130 policy->promo_increment(max_contraction)); | |
131 gclog_or_tty->print_cr(" alignment 0x%x", gen_alignment); | |
132 } | |
133 assert(result_aligned <= max_contraction, "arithmetic is wrong"); | |
134 return result_aligned; | |
135 } |