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shrink gen2 segment if it grows too large

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This commit is contained in:
Joel Dice 2007-12-07 08:31:41 -07:00
parent edf415102a
commit 612f4fa0b8
1 changed files with 26 additions and 4 deletions
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30
src/heap.cpp
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@ -7,7 +7,7 @@ using namespace vm;
namespace { namespace {
// an object must survive TenureThreshold + 2 garbage collections // an object must survive TenureThreshold + 2 garbage collections
// before being copied to gen2 (muat be at least 1): // before being copied to gen2 (must be at least 1):
const unsigned TenureThreshold = 3; const unsigned TenureThreshold = 3;
const unsigned FixieTenureThreshold = TenureThreshold + 2; const unsigned FixieTenureThreshold = TenureThreshold + 2;
@ -603,6 +603,12 @@ initNextGen1(Context* c, unsigned footprint)
} }
} }
inline bool
oversizedGen2(Context* c)
{
return c->gen2.position() < (c->gen2.capacity() / 4);
}
inline void inline void
initNextGen2(Context* c) initNextGen2(Context* c)
{ {
@ -617,8 +623,15 @@ initNextGen2(Context* c)
(&(c->nextGen2), 1, c->pageMap.scale * 1024, &(c->nextPageMap), true); (&(c->nextGen2), 1, c->pageMap.scale * 1024, &(c->nextPageMap), true);
unsigned minimum = c->gen2.position() + c->tenureFootprint + c->gen2padding; unsigned minimum = c->gen2.position() + c->tenureFootprint + c->gen2padding;
unsigned desired = max unsigned desired = minimum;
(minimum * 2, InitialGen2CapacityInBytes / BytesPerWord);
if (not oversizedGen2(c)) {
desired *= 2;
}
if (desired < InitialGen2CapacityInBytes / BytesPerWord) {
desired = InitialGen2CapacityInBytes / BytesPerWord;
}
new (&(c->nextGen2)) Segment(c, &(c->nextHeapMap), desired, minimum); new (&(c->nextGen2)) Segment(c, &(c->nextHeapMap), desired, minimum);
@ -1291,7 +1304,8 @@ collect2(Context* c)
void void
collect(Context* c, unsigned footprint) collect(Context* c, unsigned footprint)
{ {
if (c->tenureFootprint > c->gen2.remaining() if (oversizedGen2(c)
or c->tenureFootprint + c->gen2padding > c->gen2.remaining()
or c->fixieTenureFootprint) or c->fixieTenureFootprint)
{ {
c->mode = Heap::MajorCollection; c->mode = Heap::MajorCollection;
@ -1339,6 +1353,14 @@ collect(Context* c, unsigned footprint)
c->totalCollectionTime, c->totalCollectionTime,
run, run,
c->totalTime - c->totalCollectionTime); c->totalTime - c->totalCollectionTime);
fprintf(stderr,
" - gen1: %8d/%8d bytes; "
"gen2: %8d/%8d bytes\n",
c->gen1.position() * BytesPerWord,
c->gen1.capacity() * BytesPerWord,
c->gen2.position() * BytesPerWord,
c->gen2.capacity() * BytesPerWord);
} }
} }