Re: API changes to the slab allocator for NUMA memory allocation

From: Christoph Lameter <christoph_at_lameter.com>
Date: 2005-03-31 04:13:49
On Wed, 30 Mar 2005, Manfred Spraul wrote:

> Correct, I was thinking about the NUMA case.
> You've decided to add one register load to every call of kmalloc. On
> i386, kmalloc_node() is a 24-byte function. I'd bet that adding the node
> parameter to every call of kmalloc causes a .text increase larger than
> 240 bytes. And I have not yet considered that you have increased the
> number of conditional branches in every kmalloc(32,GFP_KERNEL) call by
> 33%, i.e. from 3 to 4 conditional branch instructions.
> I'd add an explicit kmalloc_node function. Attached is a prototype
> patch. You'd have to reintroduce the flags field to
> kmem_cache_alloc_node() and update kmalloc_node.
> The patch was manually edited, I hope it applies to a recent tree ;-)
>
> What do you think?

Looks fine to me.
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Received on Wed Mar 30 13:17:54 2005

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:37 EST