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.
> 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.
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