1KCALLOC(9)                Memory Management in Linux                KCALLOC(9)
2
3
4

NAME

6       kcalloc - allocate memory for an array. The memory is set to zero.
7

SYNOPSIS

9       void * kcalloc(size_t n, size_t size, gfp_t flags);
10

ARGUMENTS

12       n
13           number of elements.
14
15       size
16           element size.
17
18       flags
19           the type of memory to allocate.
20

DESCRIPTION

22       The flags argument may be one of:
23
24       GFP_USER - Allocate memory on behalf of user. May sleep.
25
26       GFP_KERNEL - Allocate normal kernel ram. May sleep.
27
28       GFP_ATOMIC - Allocation will not sleep. May use emergency pools. For
29       example, use this inside interrupt handlers.
30
31       GFP_HIGHUSER - Allocate pages from high memory.
32
33       GFP_NOIO - Do not do any I/O at all while trying to get memory.
34
35       GFP_NOFS - Do not make any fs calls while trying to get memory.
36
37       GFP_NOWAIT - Allocation will not sleep.
38
39       GFP_THISNODE - Allocate node-local memory only.
40
41       GFP_DMA - Allocation suitable for DMA. Should only be used for kmalloc
42       caches. Otherwise, use a slab created with SLAB_DMA.
43
44       Also it is possible to set different flags by OR'ing in one or more of
45       the following additional flags:
46
47       __GFP_COLD - Request cache-cold pages instead of trying to return
48       cache-warm pages.
49
50       __GFP_HIGH - This allocation has high priority and may use emergency
51       pools.
52
53       __GFP_NOFAIL - Indicate that this allocation is in no way allowed to
54       fail (think twice before using).
55
56       __GFP_NORETRY - If memory is not immediately available, then give up at
57       once.
58
59       __GFP_NOWARN - If allocation fails, don't issue any warnings.
60
61       __GFP_REPEAT - If allocation fails initially, try once more before
62       failing.
63
64       There are other flags available as well, but these are not intended for
65       general use, and so are not documented here. For a full list of
66       potential flags, always refer to linux/gfp.h.
67

69Kernel Hackers Manual 2.6.       November 2011                      KCALLOC(9)
Impressum