On Dec 7, 2007, at 4:12 PM, Balbir Singh wrote: > Kumar Gala wrote: >> >> On Dec 7, 2007, at 3:35 PM, Balbir Singh wrote: >> >>> Olof Johansson wrote: >>>> Hi, >>>> >>>> On Sat, Dec 08, 2007 at 02:44:25AM +0530, Balbir Singh wrote: >>>> >>>>> Comments are as always welcome! >>>> >>>> Care to explain what this is useful for? (Not saying it's a >>>> stupid idea, >>>> just wondering what the reason for doing it is). >>>> >>> >>> In my case, I use it to test parts of my memory controller patches >>> on an >>> emulated NUMA machine. I plan to use it to test out page migration >>> across nodes. >> >> Can you explain that further. I'm still not clear on why this is >> useful. >> >> - k > > Sure. In my case I need to emulate NUMA nodes to do some NUMA specific > testing. The memory controller I've written has some interesting data > structures like per node, per zone LRU lists. To be able to test those > features on a non-numa box is a problem, since we get just the > default node.
Maybe I'm missing something, what do you mean by memory controller you've written? (I'm use to the term 'memory controller' meaning the actual RAM control). > To be able to test the memory controller under NUMA, I use fake NUMA > nodes. x86-64 has a similar feature, the code I have here is the > simplest I could come up with for PowerPC. > > I just thought of another very interesting use case, it can be used to > split up the zone's lru lock which is highly contended. - k _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev