kmem_cache_init

[Prabhu nath]

On Fri, Mar 15, 2013 at 6:08 PM, ishare <june.tune.sea at gmail.com> wrote:

> On Fri, Mar 15, 2013 at 11:39:07AM +0530, Prabhu nath wrote:
> > kmem_cache_init() will create generalized caches from where kmalloc()
> will
> > allocate memory.
> >
> > vfs_caches_init() will create specialized caches related to VFS, like,
> > dentry, inode_cache, mnt_cache....
>
>   what is the relation between cache_cache and these two functions?
>   is there clue for understanding this?
>

        Slab cache creation  either for specialized cache or generalized
cache is done through kmem_cache_alloc().
    kmem_cache_init() is a wrapper function which will create generalized
caches again using kmem_cache_alloc()
    vfs_caches_init() is a wrapper function which will create specialized
caches required by VFS sub-system, again using kmem_cache_alloc().

    there is a slab cache named "kmem_cache"of size "struct kmem_cache"used
to allocate memory objects for slab cache descriptor "kmem_cache". Now this
slab cache will also have one descriptor. Where will you allocate memory
for this descriptor ?

The answer is - this will be allocated statically as struct kmem_cache
cache_cache.

I have attached a brief notes on "Slab Allocator" in a separate mail.
Kindly read it. Also to get more clarity read memory management chapters in
the following books.
"The Linux Kernel Primer " - Claudia Rodriguez, Gordon Fischer & Steven
Smolski
"ULK" - Daniel P Bovet.


>   thanks!
>
>
> >
> > Regards,
> > Prabhunath G
> > Linux Trainer
> > Bangalore
> >
> > On Fri, Mar 15, 2013 at 10:08 AM, ishare <june.tune.sea at gmail.com>
> wrote:
> >
> > >
> > >  the function kmem_cache_init() is allocating which area for whom to
> use ?
> > >
> > >   what is the difference comparing with vfs_caches_init() ?
> > >
> > >  thanks!
> > >
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> > >
> >
> >
> >
> > --
>



-- 
Regards,
Prabhunath G
Linux Trainer
Bangalore
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