Re: [Xen-devel] [PATCH] x86/mm: Take the p2m lock even in shadow mode.

[Tim Deegan <tim@xxxxxxx>]

At 17:42 +0000 on 21 Feb (1361468573), Tim Deegan wrote:
> At 09:58 -0500 on 21 Feb (1361440689), Andres Lagar-Cavilla wrote:
> > > The remaining locked lookups are in sh_page_fault() (in a path that's
> > > almost always already serializing on the paging lock), and in
> > > emulate_map_dest() (which can probably be updated to use
> > > get_page_from_gfn()).
> > That is absolutely the case. Here is a rough patch:
> 
> Applied, thanks.  I've taken your S-o-b below to apply to this patch
> too; hope that's OK. 

Jan, this second patch isn't necessary for 4.2 -- the performance
regression it fixes isn't even measurable on 4-vcpu compile-tests.

Tim.

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