Re: __alloc_pages: 2-order allocation failed
On Tue, 19 Apr 2005 15:40:27 -0400
Mike Edwards <sauron-debian-sparc@psychology.rutgers.edu> wrote:
> Erk. Can you give me a patch for that, or, at the very least, tell me
> what to modify? My C is rusty.
Make mm/page_alloc.c:__get_free_pages() do something like this:
page = alloc_pages(gfp_mask, order);
if (!page) {
if (order > 0)
printk("DEBUG: __get_free_pages() order %d failed "
"called by %p\n",
order, __builtin_return_address(0));
return 0;
}
> As it is, I'm going to have to reboot this box in any case. Can you
> think of a reason why an SMP kernel on a dual processor E450 only
> started one processor at boot time? (Yes, openprom sees both
> processors, and the old kernel had no problem with them, either).
Make sure CONFIG_NR_CPUS is set large enough.
It must be at least as large as the largest "physical cpu number"
of all the cpus in your machine. The physical numbering is not
necessarily linear, it can be "0 2 4 6" or similar for a 4-cpu
machine, for example.
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