On Tue, 2011-04-19 at 15:56 -0500, Christoph Lameter wrote: > On Tue, 19 Apr 2011, James Bottomley wrote: > > > > > I told you ... I forced an allocation into the first discontiguous > > > > region. That will return 1 for page_to_nid(). > > > > > > How? The kernel has no concept of a node 1 without CONFIG_NUMA and so you > > > cannot tell the page allocator to allocate from node 1. > > > > Yes, it does, as I explained in the email. > > Looked through it and canot find it. How would that be possible to do > with core kernel calls since the page allocator calls do not allow you to > specify a node under !NUMA. it's used under DISCONTIGMEM to identify the pfn array. > > Don't be silly: alpha, ia64, m32r, m68k, mips, parisc, tile and even x86 > > all use the discontigmem memory model in some configurations. > > I guess DISCONTIGMEM is typically used together with NUMA. Otherwise we > would have run into this before. Which bit of my telling you that six architectures already use it this way did you not get? I'm not really interested in reconciling your theories with how we currently operate. If you want to require NUMA with DISCONTIGMEM, fine, we'll just define SLUB as broken if that's not true ... that will fix my boot panic reports. James --- diff --git a/init/Kconfig b/init/Kconfig index 56240e7..a7ad8fb 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1226,6 +1226,7 @@ config SLAB per cpu and per node queues. config SLUB + depends on BROKEN || NUMA || !DISCONTIGMEM bool "SLUB (Unqueued Allocator)" help SLUB is a slab allocator that minimizes cache line usage -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>