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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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26
hotspot/src/share/vm/memory/defNewGeneration.cpp
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@ -214,20 +214,26 @@ void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size) {
MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start);
MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end);
eden()->initialize(edenMR, (minimum_eden_size == 0));
// If minumum_eden_size != 0, we will not have cleared any
// portion of eden above its top. This can cause newly
// expanded space not to be mangled if using ZapUnusedHeapArea.
// We explicitly do such mangling here.
if (ZapUnusedHeapArea && (minimum_eden_size != 0)) {
eden()->mangle_unused_area();
eden()->set_bounds(edenMR);
if (minimum_eden_size == 0) {
// The "minimum_eden_size" is really the amount of eden occupied by
// allocated objects -- if this is zero, then we can clear the space.
eden()->clear();
} else {
// Otherwise, we will not have cleared eden. This can cause newly
// expanded space not to be mangled if using ZapUnusedHeapArea.
// We explicitly do such mangling here.
if (ZapUnusedHeapArea) {
eden()->mangle_unused_area();
}
}
from()->initialize(fromMR, true);
to()->initialize(toMR , true);
eden()->set_next_compaction_space(from());
from()->set_bounds(fromMR); from()->clear();
to()->set_bounds(toMR); to()->clear();
// Make sure we compact eden, then from.
// The to-space is normally empty before a compaction so need
// not be considered. The exception is during promotion
// failure handling when to-space can contain live objects.
eden()->set_next_compaction_space(from());
from()->set_next_compaction_space(NULL);
}