Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.cpp @ 1656:4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
author | tonyp |
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date | Mon, 28 Jun 2010 14:13:17 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_adjoiningVirtualSpaces.cpp.incl" | |
27 | |
28 AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs, | |
29 size_t min_low_byte_size, | |
30 size_t min_high_byte_size, | |
31 size_t alignment) : | |
32 _reserved_space(rs), _min_low_byte_size(min_low_byte_size), | |
33 _min_high_byte_size(min_high_byte_size), _low(0), _high(0), | |
34 _alignment(alignment) {} | |
35 | |
36 // The maximum byte sizes are for the initial layout of the | |
37 // virtual spaces and are not the limit on the maximum bytes sizes. | |
38 void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size, | |
39 size_t init_low_byte_size, | |
40 size_t init_high_byte_size) { | |
41 | |
42 // The reserved spaces for the two parts of the virtual space. | |
43 ReservedSpace old_rs = _reserved_space.first_part(max_low_byte_size); | |
44 ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size); | |
45 | |
46 _low = new PSVirtualSpace(old_rs, alignment()); | |
47 if (!_low->expand_by(init_low_byte_size)) { | |
48 vm_exit_during_initialization("Could not reserve enough space for " | |
49 "object heap"); | |
50 } | |
51 | |
52 _high = new PSVirtualSpaceHighToLow(young_rs, alignment()); | |
53 if (!_high->expand_by(init_high_byte_size)) { | |
54 vm_exit_during_initialization("Could not reserve enough space for " | |
55 "object heap"); | |
56 } | |
57 } | |
58 | |
59 bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) { | |
60 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
61 size_t actual_change = low()->expand_into(high(), change_in_bytes); | |
62 return actual_change != 0; | |
63 } | |
64 | |
65 bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) { | |
66 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
67 size_t actual_change = high()->expand_into(low(), change_in_bytes); | |
68 return actual_change != 0; | |
69 } |