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Operating Systems Linux Linux cache
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Old 05-06-2008
Linux cache
Hi all
I am trying to understand the kernel memory management and require assistance in this regard. Kernel first creates the cache memory to perform any subsequent allocation to processes. I could not figure out how it is accomplished. Do kernel directly allocates any hardware cache or allocates a portion of ram and then try to use it again and again..?

i also read that for efficient memory management in large processes the process has to create its own cache..How can we allocate this large chunk of generic memory..

Thanks for any feedbacks
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LEARN ABOUT CENTOS

kmalloc_array

KMALLOC_ARRAY(9)					    Memory Management in Linux						  KMALLOC_ARRAY(9)

NAME

       kmalloc_array - allocate memory for an array.

SYNOPSIS

       void * kmalloc_array(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 3.10					     June 2014							  KMALLOC_ARRAY(9)