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Allocate larger chunks if we use lots of memory 

This avoids excessive GC activity on test cases that allocate
lots of memory. v4 now runs some of the test cases that were
too slow to run before.

Change-Id: Id668b03799b086445ec0fb48d577a5844f962de3
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>
This commit is contained in:
Lars Knoll 2013-01-30 08:58:27 +01:00 committed by Erik Verbruggen
parent 0cc9cb0545
commit 4f239d8fd1
1 changed files with 7 additions and 1 deletions
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8
qv4mm.cpp
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@ -58,6 +58,7 @@ struct MemoryManager::Data
enum { MaxItemSize = 256 };
Managed *smallItems[MaxItemSize/16];
uint nChunks[MaxItemSize/16];
struct Chunk {
PageAllocation memory;
int chunkSize;
@ -77,6 +78,7 @@ struct MemoryManager::Data
, engine(0)
{
memset(smallItems, 0, sizeof(smallItems));
memset(nChunks, 0, sizeof(nChunks));
scribble = qgetenv("MM_NO_SCRIBBLE").isEmpty();
aggressiveGC = !qgetenv("MM_AGGRESSIVE_GC").isEmpty();
}
@ -133,7 +135,11 @@ Managed *MemoryManager::alloc(std::size_t size)
// no free item available, allocate a new chunk
{
std::size_t allocSize = std::max(size, CHUNK_SIZE);
// allocate larger chunks at a time to avoid excessive GC, but cap at 64M chunks
uint shift = ++m_d->nChunks[pos];
if (shift > 10)
shift = 10;
std::size_t allocSize = std::max(size, CHUNK_SIZE*(1 << shift));
allocSize = roundUpToMultipleOf(WTF::pageSize(), allocSize);
Data::Chunk allocation;
allocation.memory = PageAllocation::allocate(allocSize, OSAllocator::JSGCHeapPages);