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comparison vmalloc.c @ 126:d0aa5a796fc5

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touch memory at start of algorithm to make it comparable
author Merten Sach <msach@mailbox.tu-berlin.de>
date Wed, 07 Sep 2011 14:33:22 +0200
parents 9b2b9bc2c362
children 99798e4438a6 1fe7ba1ab81f
comparison
equal deleted inserted replaced
19:d1ee00670148 20:535b0f2c7154
340 //Create first element in lastContainer 340 //Create first element in lastContainer
341 MallocProlog *firstChunk = malloc( MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE ); 341 MallocProlog *firstChunk = malloc( MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE );
342 if( firstChunk == NULL ) {printf("Can't allocate initial memory\n"); exit(1);} 342 if( firstChunk == NULL ) {printf("Can't allocate initial memory\n"); exit(1);}
343 freeLists->memSpace = firstChunk; 343 freeLists->memSpace = firstChunk;
344 344
345 //Touch memory to avoid page faults
346 void *ptr,*endPtr;
347 endPtr = (void*)firstChunk+MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE;
348 for(ptr = firstChunk; ptr < endPtr; ptr+=PAGE_SIZE)
349 {
350 *(char*)ptr = 0;
351 }
352
345 firstChunk->nextLowerInMem = NULL; 353 firstChunk->nextLowerInMem = NULL;
346 firstChunk->nextHigherInMem = (MallocProlog*)((uintptr_t)firstChunk + 354 firstChunk->nextHigherInMem = (MallocProlog*)((uintptr_t)firstChunk +
347 MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE - sizeof(MallocProlog*)); 355 MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE - sizeof(MallocProlog*));
348 firstChunk->nextChunkInFreeList = NULL; 356 firstChunk->nextChunkInFreeList = NULL;
349 //previous element in the queue is the container 357 //previous element in the queue is the container