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6711316: Open source the Garbage-First garbage collector

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First mercurial integration of the code for the Garbage-First garbage collector.

Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
This commit is contained in:
Y. Srinivas Ramakrishna 2008-06-05 15:57:56 -07:00
parent 39463bb3fc
commit 18f3386a98
215 changed files with 36088 additions and 1249 deletions
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28
hotspot/src/share/vm/runtime/virtualspace.cpp
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@ -235,24 +235,16 @@ void ReservedSpace::initialize(size_t size, size_t alignment, bool large,
// increase size to a multiple of the desired alignment
size = align_size_up(size, alignment);
size_t extra_size = size + alignment;
char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
if (extra_base == NULL) return;
// Do manual alignement
base = (char*) align_size_up((uintptr_t) extra_base, alignment);
assert(base >= extra_base, "just checking");
// Release unused areas
size_t unused_bottom_size = base - extra_base;
size_t unused_top_size = extra_size - size - unused_bottom_size;
assert(unused_bottom_size % os::vm_allocation_granularity() == 0,
"size not allocation aligned");
assert(unused_top_size % os::vm_allocation_granularity() == 0,
"size not allocation aligned");
if (unused_bottom_size > 0) {
os::release_memory(extra_base, unused_bottom_size);
}
if (unused_top_size > 0) {
os::release_memory(base + size, unused_top_size);
}
do {
char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
if (extra_base == NULL) return;
// Do manual alignement
base = (char*) align_size_up((uintptr_t) extra_base, alignment);
assert(base >= extra_base, "just checking");
// Re-reserve the region at the aligned base address.
os::release_memory(extra_base, extra_size);
base = os::reserve_memory(size, base);
} while (base == NULL);
}
}
// Done