Re: [Lse-tech] Re: [RFC] Dynamic percpu data allocator

[Mala Anand]

On Thu, May 30, 2002 at 08:56:36AM -0500, Mala Anand wrote:
>>

>>                       [e-mail]

>>                       m                                To:       BALBIR
SINGH <[e-mail]>
>>
>>The per-cpu data allocator allocates one copy for *each* CPU.
>> >It uses the slab allocator underneath. Eventually, when/if we have
>> >per-cpu/numa-node slab allocation, the per-cpu data allocator
>> >can allocate every CPU's copy from memory closest to it.
>>
>> Does this mean that memory allocation will happen in "each" CPU?
>> Do slab allocator allocate the memory in each cpu? Your per-cpu
>> data allocator sounds like the hot list skbs that are in the tcpip stack
>> in the sense it is one level above the slab allocator and the list is
>> kept per cpu.  If slab allocator is fixed for per cpu, do you still
>> need this per-cpu data allocator?

>Actually I don't know for sure what plans are afoot to fix the slab
allocator
>for per-cpu. One plan I heard about was allocating from per-cpu pools
>rather than per-cpu copies. My requirements are similar to
>the hot list skbs. I want to do this -

I looked at the slab code, per cpu slab is already implemented by Manfred
Spraul.
Look at cpu_data[NR_CPUS] in kmem_cache_s structure.

Regards,
    Mala

   Mala Anand
   E-mail:[e-mail]
   Linux Technology Center - Performance
   Phone:[phone]; Tie-line:678-8088