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SubjectRe: Fw: [BUG][PATCH] fix mempolcy's check on a system with memory-less-node take3
On Thu, 8 Feb 2007 11:28:30 -0800 (PST)
Christoph Lameter <clameter@sgi.com> wrote:
> > @@ -193,9 +197,11 @@
> > break;
> > case MPOL_BIND:
> > policy->v.zonelist = bind_zonelist(nodes);
> > - if (policy->v.zonelist == NULL) {
> > + if (IS_ERR(policy->v.zonelist)) {
> > + void *val = policy->v.zonelist;
> > + policy->v.zonelist = NULL;
>
> void *? Ahh. It takes the error code.
>
> Looks good. But if we are really going down this road of memory-less
> nodes we may want to audit the kernel for other issues.
>
> Could you run a series of tests on that machine?
>
Yes. The program which caused trouble works fine.
I used 'numademo' command in numactl package.
It works fine (reports -EINVAL) with this patch now.

I uses this a system with an empty-node for 5 months.
reported 2 bugs.
- oom-kill's memory less node detection logic.
- mempolicy's NULL access(this)

It works fine in general.
(old RHEL4/linux-2.6.9 kernel doesn't boot on this system.)

-Kame









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