kmalloc — allocate memory
void * kmalloc ( | size_t | size, |
gfp_t | flags) ; |
kmalloc is the normal method of allocating memory in the kernel.
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.
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.
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_DMA
- Request memory from the DMA-capable zone.
__GFP_HIGH
- This allocation has high priority and may use emergency pools.
__GFP_HIGHMEM
- Allocated memory may be from highmem.
__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.