Re: memory zone and slab

[ishare <june.tune.sea@gmail.com>]

On Fri, Mar 08, 2013 at 11:44:37AM +0000, Mario Smarduch wrote:
> 
> The zonelists are initialized in 'build_all_zonelists()' 
> called by 'start_kernel()'. But prior to that point
> there is allot of other code that determines the 
> various zones and holes a key function is free_area_init_node().
> But that function will also reference prior initialization
> in 'setup_arch()' which may take you all the way back
> to bootloader  
> Nodes have zones, and zones define what the memory is 
> appropriate for, DMA or lowmem, Normal memory or High memory
> for 32 bit. For 64 bit there are fewer zones just primarily
> 32 bit DMA and normal 64 bit. Zones are further divided
> into free areas of 2^n consecutive pages.
> 
> Slabs are typically pages carved up into smaller units of 
> allocations. 
  
  Does this mean slab is based on zone ?
  slab is just a optimized algorithm for normal allocator?
  
  thanks!
   




> There are several kernel books but outdated, but nevertheless good
> starting points, just search for 'Kernel Internals'
> 
> BR,
>  Mario.
> 
> 
> -----Original Message-----
> From: linux-newbie-owner@vger.kernel.org [mailto:linux-newbie-owner@vger.kernel.org] On Behalf Of ishare
> Sent: Thursday, March 07, 2013 3:35 PM
> To: linux-newbie@vger.kernel.org
> Subject: memory zone and slab
> 
> 
>    when does the memory zonelist initialized in kernel ?
> 
>    what is the difference between zonelists and slab for memory manage .
> 
>    are there some man docs or sites  helpful to understand this ?
>    
>    thanks! 
>   
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