kmem_cache_alloc(9) [linux man page]

KMEM_CACHE_ALLOC(9)					    Memory Management in Linux					       KMEM_CACHE_ALLOC(9)

NAME

       kmem_cache_alloc - Allocate an object

SYNOPSIS

       void * kmem_cache_alloc(struct kmem_cache * cachep, gfp_t flags);

ARGUMENTS

       cachep
	   The cache to allocate from.

       flags
	   See kmalloc.

DESCRIPTION

       Allocate an object from this cache. The flags are only relevant if the cache has no available objects.

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010						       KMEM_CACHE_ALLOC(9)

KCALLOC(9)						    Memory Management in Linux							KCALLOC(9)

NAME

       kcalloc - allocate memory for an array. The memory is set to zero.

SYNOPSIS

       void * kcalloc(size_t n, size_t size, gfp_t flags);

ARGUMENTS

       n
	   number of elements.

       size
	   element size.

       flags
	   the type of memory to allocate.

DESCRIPTION

       The flags argument may be one of:

       GFP_USER - Allocate memory on behalf of user. May sleep.

       GFP_KERNEL - Allocate normal kernel ram. May sleep.

       GFP_ATOMIC - Allocation will not sleep. May use emergency pools. For example, use this inside interrupt handlers.

       GFP_HIGHUSER - Allocate pages from high memory.

       GFP_NOIO - Do not do any I/O at all while trying to get memory.

       GFP_NOFS - Do not make any fs calls while trying to get memory.

       GFP_NOWAIT - Allocation will not sleep.

       GFP_THISNODE - Allocate node-local memory only.

       GFP_DMA - Allocation suitable for DMA. Should only be used for kmalloc caches. Otherwise, use a slab created with SLAB_DMA.

       Also it is possible to set different flags by OR'ing in one or more of the following additional flags:

       __GFP_COLD - Request cache-cold pages instead of trying to return cache-warm pages.

       __GFP_HIGH - This allocation has high priority and may use emergency pools.

       __GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail (think twice before using).

       __GFP_NORETRY - If memory is not immediately available, then give up at once.

       __GFP_NOWARN - If allocation fails, don't issue any warnings.

       __GFP_REPEAT - If allocation fails initially, try once more before failing.

       There are other flags available as well, but these are not intended for general use, and so are not documented here. For a full list of
       potential flags, always refer to linux/gfp.h.

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010								KCALLOC(9)