Re: [2.6.20][PATCH] fix mempolicy error check on a system with memory-less-node

KAMEZAWA Hiroyuki
2007-02-07T08:37:05Z

On Wed, 7 Feb 2007 00:04:41 -0800 (PST)
Christoph Lameter <clameter@sgi.com> wrote:

> On Wed, 7 Feb 2007, KAMEZAWA Hiroyuki wrote:
>
> > > Hmmm... Remove the node from the node_online_map instead?
> > >
> > Changing defintion of node_online_map is harmfil. (there are cpu-only-nodes.)
> > How about adding nodemask for nodes equips memory ?
>
> Ok that is better but...
>
> Would it be possible to attach the cpus to the
> next nodes with memory and mark the node offline? That way we could avoid
> another mask that we constantly have to check?
>
Added ia64 list to CC.
I know ia64 kernel did what you say in old days (I know RHEL4/2.6.9 kernel does it).
Someone changed it and created cpu-only-node for some purpose, I don't know why.

> Or fix the location where the error occurred to be able to tolerate a node
> with no zones?
>
Hmm,
In this case, MPOL_MBIND, the user requests to allocate memory from specified nodes.
I think it's better to tell him "you can't do that" than silently allocating memory
from other places.

-Kame