On Wed, 2007-08-08 at 13:26 -0700, Christoph Lameter wrote: > On Wed, 8 Aug 2007, Lucio Correia wrote: > > > Hi Christoph, > > > > I found a problem with SLUB when trying to boot a kdump kernel on a Cell > > QS20 Blade running Fedora 7, kernel 2.6.22.5. If I use SLAB for the > > kdump kernel, everything works ok. The fact is that SLUB doesn't find a > > page frame for allocation in the current node, due to the flag > > GFP_THISNODE on a call to new_slab, and stops at a BUG_ON on line 1802 > > of slub.c. > > This is due to the node 1 having only one page. Could you just switch node > 1 off? > > SLAB boots because it falls back to node 0 for the control structures. So > it creates useless control structures for node 1. These are then never > used since any allocation attempt to node 1 falls back to node 0.
Hi Christoph, Shouldn't SLUB falls back to other node also for the case it can't allocate memory? > > > I understand that this flag should not be removed, and that there is a > > better solution, but it demonstrates the problem. Could you give me some > > direction on the better way to solve this problem? > > Do not create a node that just has one page in it? > > Or make it truly empty? An empty node will cause GFP_THISNODE to fall back > and you then have the same useless control structure allocation as on > SLAB. -- Lucio Correia Software Engineer IBM LTC Brazil - 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/
