Re: [2.6.24-rc8-mm1][regression?] numactl --interleave=all doesn't works on memoryless node.

Lee Schermerhorn
2008-02-05T15:23:41Z

On Tue, 2008-02-05 at 14:31 +0000, Mel Gorman wrote:
> On (04/02/08 13:20), Lee Schermerhorn didst pronounce:
> > > > When the kernel behaviour changes and breaks user space then the kernel
> > > > is usually wrong. Cc'ed Lee S. who maintains the kernel code now.
> >
> > The memoryless nodes patch series changed a lot of things, so just
> > reverting this one area [mpol_check_policy()] probably won't restore the
> > prior behavior. A fully populated node mask is not necessarily a proper
> > subset of node_online_map(). And contextualize_policy() also requires
> > the mask to be a subset of mems_allowed which also defaults to nodes
> > with memory.
> >
> > I don't know how Mel Gorman's "two zonelist" series, which is still
> > awaiting a window into the -mm tree, affects this behavior. Those
> > patches will certainly be affected by whatever we decide here.
> >
>
> I doubt they'd make a difference to this particular problem.

I didn't really think so, but I wanted to give you a heads up regarding
this, as I think it will affect your patches. I'm hoping we'll see them
in -mm soon after the .25 merge window closes. If you get there before
a fix to this issue, so much the better, IMO :-).

Lee

>