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ntdll: Increase subheap size quadratically to avoid slowdown when allocating tons of heap memory.

This commit is contained in:
Alexandre Julliard 2008-11-18 12:49:12 +01:00
parent 369da3aeb9
commit c38ce28af5
1 changed files with 7 additions and 3 deletions
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10
dlls/ntdll/heap.c
View File

@ -142,9 +142,10 @@ typedef struct tagHEAP
struct list entry; /* Entry in process heap list */
struct list subheap_list; /* Sub-heap list */
struct list large_list; /* Large blocks list */
SIZE_T grow_size; /* Size of next subheap for growing heap */
DWORD magic; /* Magic number */
RTL_CRITICAL_SECTION critSection; /* Critical section for serialization */
FREE_LIST_ENTRY freeList[HEAP_NB_FREE_LISTS]; /* Free lists */
FREE_LIST_ENTRY freeList[HEAP_NB_FREE_LISTS] DECLSPEC_ALIGN(8); /* Free lists */
} HEAP;
#define HEAP_MAGIC ((DWORD)('H' | ('E'<<8) | ('A'<<16) | ('P'<<24)))
@ -808,6 +809,7 @@ static SUBHEAP *HEAP_CreateSubHeap( HEAP *heap, LPVOID address, DWORD flags,
heap = (HEAP *)address;
heap->flags = flags;
heap->magic = HEAP_MAGIC;
heap->grow_size = max( HEAP_DEF_SIZE, totalSize );
list_init( &heap->subheap_list );
list_init( &heap->large_list );
@ -918,11 +920,13 @@ static ARENA_FREE *HEAP_FindFreeBlock( HEAP *heap, SIZE_T size,
if (total_size < size) return NULL; /* overflow */
if (!(subheap = HEAP_CreateSubHeap( heap, NULL, heap->flags, total_size,
max( HEAP_DEF_SIZE, total_size ) )))
max( heap->grow_size, total_size ) )))
return NULL;
if (heap->grow_size < 128 * 1024 * 1024) heap->grow_size *= 2;
TRACE("created new sub-heap %p of %08lx bytes for heap %p\n",
subheap, total_size, heap );
subheap, subheap->size, heap );
*ppSubHeap = subheap;
return (ARENA_FREE *)((char *)subheap->base + subheap->headerSize);