Re: [PATCH] [3/16] POISON: Handle poisoned pages in page free

Andi Kleen
2009-04-08T06:49:25Z

> >
> >        /*
> > +        * Page may have been marked bad before process is freeing it.
> > +        * Make sure it is not put back into the free page lists.
> > +        */
> > +       if (PagePoison(page)) {
> > +               /* check more flags here... */
>
> How about adding WARNING with some information(ex, pfn, flags..).

The memory_failure() code is already quite chatty. Don't think more
noise is needed currently.

Or are you worrying about the case where a page gets corrupted
by software and suddenly has Poison bits set? (e.g. 0xff everywhere).
That would deserve a printk, but I'm not sure how to reliably test for
that. After all a lot of flag combinations are valid.

-Andi

--
ak@linux.intel.com -- Speaking for myself only.