zprint(1) [mojave man page]

ZPRINT(1)						    BSD General Commands Manual 						 ZPRINT(1)

NAME

     zprint -- show information about kernel zones

SYNOPSIS

     zprint [-cdhlLstw] [name]

DESCRIPTION

     zprint displays data about Mach zones (allocation buckets).  By default, zprint will print out information about all Mach zones.  If the
     optional name is specified, zprint will print information about each zone for which name is a substring of the zone's name.

     zprint interprets the following options:

     -c 	(Default) zprint prints zone info in columns. Long zone names are truncated with '$', and spaces are replaced with '.', to allow
		for sorting by column.	Pageable and collectible zones are shown with 'P' and 'C' on the far right, respectively.  Zones with pre-
		posterously large maximum sizes are shown with '----' in the max size and max num elts fields.

     -d 	Display deltas over time, showing any zones that have achieved a new maximum current allocation size during the interval.  If the
		total allocation sizes are being displayed for the zones in question, it will also display the deltas if the total allocations
		have doubled.

     -h 	(Default) Shows headings for the columns printed with the -c option.  It may be useful to override this option when sorting by
		column.

     -l 	(Default) Show all wired memory information after the zone information.

     -L 	Do not show all wired memory information after the zone information.

     -s 	zprint sorts the zones, showing the zone wasting the most memory first.

     -t 	For each zone, zprint calculates the total size of allocations from the zone over the life of the zone.

     -w 	For each zone, zprint calculates how much space is allocated but not currently in use, the space wasted by the zone.

     Any option (including default options) can be overridden by specifying the option in upper-case; for example, -C overrides the default option
     -c.

DIAGNOSTICS

     The zprint utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     ioclasscount(1), lsmp(1), lskq(1),

Mac OS X							    2 May 2016								  Mac OS X

MALLOC_ZONE_MALLOC(3)					   BSD Library Functions Manual 				     MALLOC_ZONE_MALLOC(3)

NAME

     malloc_create_zone, malloc_destroy_zone, malloc_default_zone, malloc_zone_from_ptr, malloc_zone_malloc, malloc_zone_calloc,
     malloc_zone_valloc, malloc_zone_realloc, malloc_zone_memalign, malloc_zone_free -- zone-based memory allocation

SYNOPSIS

     #include <malloc/malloc.h>

     malloc_zone_t *
     malloc_create_zone(vm_size_t start_size, unsigned flags);

     void
     malloc_destroy_zone(malloc_zone_t *zone);

     malloc_zone_t *
     malloc_default_zone(void);

     malloc_zone_t *
     malloc_zone_from_ptr(const void *ptr);

     void *
     malloc_zone_malloc(malloc_zone_t *zone, size_t size);

     void *
     malloc_zone_calloc(malloc_zone_t *zone, size_t num_items, size_t size);

     void *
     malloc_zone_valloc(malloc_zone_t *zone, size_t size);

     void *
     malloc_zone_realloc(malloc_zone_t *zone, void *ptr, size_t size);

     void *
     malloc_zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size);

     void
     malloc_zone_free(malloc_zone_t *zone, void *ptr);

DESCRIPTION

     The malloc_create_zone() function creates a malloc zone, advising an initial allocation of start_size bytes, and specifying flags that alter
     the standard behavior of the zone.  The returned malloc zone can be used to provide custom allocation and deallocation behavior, and to
     retrieve additional information about the allocations in that zone.

     The malloc_destroy_zone() function deallocates all memory associated with objects in zone as well as zone itself.

     The malloc_default_zone() function returns the default system malloc zone, used by malloc(3), and free(3).

     The malloc_zone_from_ptr() function returns a pointer to the malloc zone which contains ptr or NULL, if the pointer does not point to an
     allocated object in any current malloc zone.

     The malloc_zone_malloc(), malloc_zone_calloc(), malloc_zone_valloc(), malloc_zone_realloc(), malloc_zone_memalign(), and malloc_zone_free()
     perform the same task on zone as their non-prefixed variants, malloc(3), calloc(3), valloc(3), realloc(3), posix_memalign(3), and free(3)
     perform on the default system malloc zone.

RETURN VALUES

     The malloc_create_zone(), malloc_default_zone(), and malloc_zone_from_ptr() functions return a pointer to a malloc_zone_t structure, or NULL
     if there was an error.

     The malloc_zone_malloc(), malloc_zone_calloc(), malloc_zone_valloc(), malloc_zone_realloc(), and malloc_zone_memalign() functions return a
     pointer to allocated memory.  If there is an error, they return a NULL pointer.  They are not required to set errno.

SEE ALSO

     malloc(3), posix_memalign(3)

BSD
								   Aug 13, 2008 							       BSD