Re: [Xen-devel] [PATCH 1/2] xen/p2m: Fix for 32-bit builds the"Reserve 8MB of _brk space for P2M"

[Konrad Rzeszutek Wilk]

On Thu, Aug 16, 2012 at 11:50:13AM -0400, Konrad Rzeszutek Wilk wrote:
> The git commit 5bc6f9888db5739abfa0cae279b4b442e4db8049
> xen/p2m: Reserve 8MB of _brk space for P2M leafs when populating back.
> 
> extended the _brk space to fit 1048576 PFNs. The math is that each
> P2M leaf can cover PAGE_SIZE/sizeof(unsigned long) PFNs. In 64-bit
> that means 512 PFNs, on 32-bit that is 1024. If on 64-bit machines
> we want to cover 4GB of PFNs, that means having enough for space
> to fit 1048576 unsigned longs.

Scratch that patch. This is better, but even with that I am still
hitting some weird 32-bit cases.