Re: [RFC][PATCH 1/3] radix priority search tree - objrmap complexity fix

Christoph Hellwig
2004-04-02T19:54:10Z

On Fri, Apr 02, 2004 at 09:29:41PM +0200, Andrea Arcangeli wrote:
> page->private indicates:
>
> >>> (0xc0772380L-0xc07721ffL)/32
> 12L
>
> that's the 12th page in the array.
>
> can you check in the asm (you should look at address c0048c7c) if it's
> the first bug that triggers?
>
> if (page[1].index != order)
> bad_page(__FUNCTION__, page);

No, it's the second one (and yes, I get lots of theses backtraces, unless
I counted wrongly 19 this time)

> the whole compound thing is very screwed in the above scenario.
>
> Do you have CONFIG_DEBUG_PAGEALLOC enabled?

no. it's not available on ppc32.

> could be compound never worked right on ppc, dunno. You could try to
> backout the patch gfp-no-compound and to recompile with hugetlbfs
> enabled (can you enable it on PPC?).

no, there's no hugetlb support on ppc32.