osfmk/kern/zalloc.c

62  *	Zone-based memory allocator.  A zone is a collection of fixed size
113  * (3) Poison the freed memory by overwriting it with 0xdeadbeef, and check it when the
114  *     memory is being reused to make sure it is still poisoned.
164 	/* should we run checks on this piece of memory? */
272  * map. When an individual zone needs more storage, memory is allocated
339  *	The VM system gives us an initial chunk of memory.
459  * memory configurations.  The default value is 4000 records.
607 	vm_size_t		za_size;			/* how much memory did this allocation take up? */
779 	 * If we fail to allocate memory, don't further tax
812  * The refcount is incremented by the amount of memory the allocation consumes.
934 				panic("Freeing as size %lu memory that was allocated with size %lu\n",
1085 	vm_size_t	max,		/* maximum memory to use */
1229 			 * We got the memory for the log.  Zero it out since the code needs this to identify unused records.
1237 			printf("zone: couldn't allocate memory for zrecords, turning off zleak logging\n");
1328  *	Cram the given memory into the specified zone.
1367  *	Steal memory for the zone package.  Called from
1376 	/* Request enough early memory to get to the pmap zone */
1383  * Fill a zone with enough memory to contain at least nelem elements.
1386  * be more than the caller asked for since the memory allocation is
1396 	vm_offset_t	memory;
1404 	kr = kmem_alloc_kobject(kernel_map, &memory, size);
1409 	zcram(zone, memory, size);
1417  *	Initialize the "zone of zones" which uses fixed memory allocated
1418  *	earlier in memory initialization.  zone_bootstrap is called
1475 			 * This prevents accidentally hogging too much kernel memory and making the system
1725 			 *	Someone is allocating memory for this zone.
1756 					 * memory back, assuming there's no
2083 /* Keep this FALSE by default.  Large memory machine run orders of magnitude
2127 		panic("zfree: non-allocated memory in collectable zone!");
2242 	 * If elements have one or more pages, and memory is low,
2327  * were never zalloc'd/zget'd. The correct way to stuff memory
2590  *	begins to run out of memory.