On Thu, 3 May 2007, Andrew Morton wrote:
> On Wed, 2 May 2007 10:25:47 -0700 (PDT) Christoph Lameter <[email protected]> wrote:
>
> > +config ARCH_USES_SLAB_PAGE_STRUCT
> > + bool
> > + default y
> > + depends on SPLIT_PTLOCK_CPUS <= NR_CPUS
> > +
>
> That all seems to work as intended.
>
> However with NR_CPUS=8 SPLIT_PTLOCK_CPUS=4, enabling SLUB=y crashes the
> machine early in boot.
I thought that if that worked as intended, you wouldn't even
get the chance to choose SLUB=y? That was how it was working
for me (but I realize I didn't try more than make oldconfig).
>
> Too early for netconsole, no serial console. Wedges up uselessly with
> CONFIG_XMON=n, does mysterious repeated uncontrollable exceptions with
> CONFIG_XMON=y. This is all fairly typical for a powerpc/G5 crash :(
>
> However I was able to glimpse some stuff as it flew past. Crash started in
> flush_old_exec and ended in pgtable_free_tlb -> kmem_cache_free. I don't know
> how to do better than that I'm afraid, unless I'm to hunt down a PCIE serial
> card, perhaps.
That sounds like what happens when SLUB's pagestruct use meets
SPLIT_PTLOCK's pagestruct use. Does your .config really show
CONFIG_SLUB=y together with CONFIG_ARCH_USES_SLAB_PAGE_STRUCT=y?
Hugh
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