linux-kernel - Re: CONFIG_NUMA breaks hibernation on x86-32 with PAE

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Date:	Mon, 10 Nov 2008 19:28:03 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: CONFIG_NUMA breaks hibernation on x86-32 with PAE

On Monday, 10 of November 2008, Andi Kleen wrote:
> Ingo Molnar <mingo@...e.hu> writes:
> >
> > No good ideas - the bug description gives me the impression of memory 
> > maps save/restore hickup in the hibernation code - and memory maps are 
> > pretty much the only thing that are significantly different on NUMA. 
> 
> I assume the problem happened on a single node system.
> On single node the memory map should be actually quite similar
> to the UMA case.

It is.  However, the problem is 100% reproducible on any 32-bit single-node
system with CONFIG_NUMA set, from what I can tell.

It doesn't happen if the kernel is booted with highmem=0, so it looks like
the code that saves highmem causes the problem to happen.  However, this
same code works well for all of the !CONFIG_NUMA cases and practically only
the only non-open-coded it uses is kmap_atomic().

> One possibility would be to bisect if it ever worked?

Not sure it did, probably not. :-(

BTW, can you please tell me why HIGHMEM64G is requisite for NUMA on 32-bit?

Thanks,
Rafael
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