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Operating Systems Linux Linux cache
# 1  
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 LINUX

kmem_cache_create

KMEM_CACHE_CREATE(9)                                        Memory Management in Linux                                        KMEM_CACHE_CREATE(9)

NAME

       kmem_cache_create - Create a cache.

SYNOPSIS

       struct kmem_cache * kmem_cache_create(const char * name, size_t size, size_t align, unsigned long flags, void (*ctor) (void *));

ARGUMENTS

       name
           A string which is used in /proc/slabinfo to identify this cache.

       size
           The size of objects to be created in this cache.

       align
           The required alignment for the objects.

       flags
           SLAB flags

       ctor
           A constructor for the objects.

DESCRIPTION

       Returns a ptr to the cache on success, NULL on failure. Cannot be called within a int, but can be interrupted. The ctor is run when new
       pages are allocated by the cache.

       name must be valid until the cache is destroyed. This implies that the module calling this has to destroy the cache before getting
       unloaded. Note that kmem_cache_name is not guaranteed to return the same pointer, therefore applications must manage it themselves.

       The flags are

       SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) to catch references to uninitialised memory.

       SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check for buffer overruns.

       SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware cacheline. This can be beneficial if you're counting cycles as closely
       as davem.

COPYRIGHT

Kernel Hackers Manual 2.6.                                           July 2010                                                KMEM_CACHE_CREATE(9)