> > +#if 0
> > if (!s->remote_node_defrag_ratio ||
> > get_cycles() % 1024 > s->remote_node_defrag_ratio)
> > return NULL;
> > +#endif
> >
> > zonelist = node_zonelist(slab_node(current->mempolicy), flags);
> > for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
>
> Hmmm.... So always take from partial lists works? That is the same effect that
> the setting of the remote_defrag_ratio to 100 should have had (its multiplied
> by 10 when storing it).
Sorry, I don't know reason.
OK, I'll digg it more.
> So its a NUMA only phenomenon. How is performance affected?
Unfortunately, I can't mesure it.
because
- Fujitsu server can access remote node fastly than typical numa server.
So, my performance number often isn't typical.
- My box (4G x2node) is very small in NUMA machine.
but that is large server improving mechanism.
IOW, My box didn't happend performance regression.
but I think it isn't typical.
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