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

Michal Hocko
2019-11-25T08:41:03Z

On Fri 22-11-19 23:05:43, Pengfei Li wrote:
> 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.

Sensible performance numbers on multiple workloads (ideally some real
world ones rather than artificial microbenchmarks) is essential for a
performance optimization that is this large.
--
Michal Hocko
SUSE Labs