Re: [PATCH] [1/4] SLAB: Handle node-not-up case in fallback_alloc() v2

Andi Kleen
2010-02-11T21:55:12Z

On Thu, Feb 11, 2010 at 01:41:53PM -0800, David Rientjes wrote:
> On Thu, 11 Feb 2010, Andi Kleen wrote:
>
> > When fallback_alloc() runs the node of the CPU might not be initialized yet.
> > Handle this case by allocating in another node.
> >
> > v2: Try to allocate from all nodes (David Rientjes)
> >
>
> You don't need to specifically address the cpuset restriction in
> fallback_alloc() since kmem_getpages() will return NULL whenever a zone is
> tried from an unallowed node, I just thought it was a faster optimization
> considering you (i) would operate over a nodemask and not the entire
> zonelist, (ii) it would avoid the zone_to_nid() for all zones since you
> already did a zonelist iteration in this function, and (iii) it wouldn't
> needlessly call kmem_getpages() for unallowed nodes.

Thanks for the review again.

I don't really care about performance at all for this, this is just for
a few allocations during the memory hotadd path.

-Andi

--
ak@linux.intel.com -- Speaking for myself only.