On Thu, 3 May 2007 09:46:32 +0100 (BST) Hugh Dickins <[EMAIL PROTECTED]> wrote:
> 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). Right. This can be tested on x86 without a cross-compiler: ARCH=powerpc make mrproper ARCH=powerpc make fooconfig > > > > 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? > Nope. g5:/usr/src/25> grep SLUB .config CONFIG_SLUB=y g5:/usr/src/25> grep SLAB .config # CONFIG_SLAB is not set g5:/usr/src/25> grep CPUS .config CONFIG_NR_CPUS=8 # CONFIG_CPUSETS is not set # CONFIG_IRQ_ALL_CPUS is not set CONFIG_SPLIT_PTLOCK_CPUS=4 It's in http://userweb.kernel.org/~akpm/config-g5.txt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
