Re: [RFC v1 00/19] Modify zonelist to nodelist v1

Pengfei Li
2019-11-22T15:06:21Z

On Thu, 21 Nov 2019 19:04:01 +0100
Michal Hocko <mhocko@kernel.org> wrote:

> On Thu 21-11-19 23:17:52, Pengfei Li wrote:
> [...]
> > Since I don't currently have multiple node NUMA systems, I would be
> > grateful if anyone would like to test this series of patches.
>
> I didn't really get to think about the actual patchset. From a very
> quick glance I am wondering whether we need to optimize as there are
> usually only small amount of numa nodes. But I am quite busy so I
> cannot really do any claims.

Thanks for your comments.

I think it's time to modify the zonelist to nodelist because the
zonelist is always in node order and the page reclamation is based on
node.

I will do more performance testing to show that multi-node systems will
benefit from this series of patches.

> Anyway, you can test this even without NUMA HW. Have a look at
> numa=fake option (numa_emu_cmdline). Or you can use kvm/qemu which
> provides easy ways to setup a NUMA capable virtual machine.

Thanks a lot. I will use the numa=fake option to do more performance
testing.