Messages in this thread | | | Date | Thu, 3 May 2007 09:46:32 +0100 (BST) | From | Hugh Dickins <> | Subject | Re: 2.6.22 -mm merge plans: slub |
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On Thu, 3 May 2007, Andrew Morton wrote: > On Wed, 2 May 2007 10:25:47 -0700 (PDT) Christoph Lameter <clameter@sgi.com> 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?
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