Hi all, On Fri, 16 Aug 2013 14:52:11 -0700 Kevin Hilman wrote: > > Johannes Weiner writes: > > > On Fri, Aug 16, 2013 at 10:17:01AM -0700, Kevin Hilman wrote: > >> Johannes Weiner writes: > >> > On Wed, Aug 07, 2013 at 11:37:43AM -0400, Johannes Weiner wrote: > >> > Subject: [patch] mm: page_alloc: use vmstats for fair zone allocation batching > >> > > >> > Avoid dirtying the same cache line with every single page allocation > >> > by making the fair per-zone allocation batch a vmstat item, which will > >> > turn it into batched percpu counters on SMP. > >> > > >> > Signed-off-by: Johannes Weiner > >> > >> I bisected several boot failures on various ARM platform in > >> next-20130816 down to this patch (commit 67131f9837 in linux-next.) > >> > >> Simply reverting it got things booting again on top of -next. Example > >> boot crash below. > > > > Thanks for the bisect and report! > > You're welcome. Thanks for the quick fix! > > > I deref the percpu pointers before initializing them properly. It > > didn't trigger on x86 because the percpu offset added to the pointer > > is big enough so that it does not fall into PFN 0, but it probably > > ended up corrupting something... > > > > Could you try this patch on top of linux-next instead of the revert? > > Yup, that change fixes it. > > Tested-by: Kevin Hilman > Tested-by: Stephen Warren I will add that into the akpm-current tree in linux-next today (unless Andrew releases a new mmotm in the mean time). -- Cheers, Stephen Rothwell sfr@canb.auug.org.au