Re: NUMA aware slab allocator V3

[Jesse Barnes]

On Wednesday, May 18, 2005 10:07 pm, Christoph Lameter wrote:
> Here is a revised patch. Would be good if someone could review my use
> of online_cpu / online_node etc. Is there some way to bring cpus
> online and offline to test if this really works? Seems that the code
> in alloc_percpu is suspect even in the old allocator because it may
> have to allocate memory for non present cpus.

If you have hotplug enabled, I think you'll see an 'online' file that 
you can echo 1 or 0 into, somewhere in /sys/devices/system/cpu/cpu0 for 
example.  It should work even on machines where it doesn't actually 
power down the slot (it'll just remove it from the online map, and it 
won't get scheduled on, etc.); at least it did last time I tested it.

Jesse
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