On Thu, 23 Feb 2006, Ravikiran G Thirumalai wrote:
> Actually, all cpus on the node share the alien_cache, and the alien_cache is
> one per remote node (for the cachep). So currently each cpu on the node
> drains the same alien_cache onto all the remote nodes in the per-cpu eventd.
Right. So we could optimize that.
> What is probably very expensive here at drain_alien_cache is free_block
> getting called from the foreign node, and freeing remote pages.
> We have a patch-set here to drop-in the alien objects from the current node to
> the respective alien node's drop box, and that drop box will be cleared
> locally (so that freeing happens locally). This would happen off cache_reap.
> (I was holding from posting it because akpm complained about slab.c
Could you show us the patch?
> Round robin might still be useful for drain_alien_cache with that approach,
> but maybe init_reap_node should initialize the per-cpu reap_node with a skew
> for cpus on the same node (so all cpus of a node do not drain to the same
> foreign node when the eventd runs?)
Good idea.
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