Re: [Xen-devel] [PATCH 0/2, v2] x86: adjust entry frame generation

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 30/10/2012 15:20, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:

>>>> On 02.10.12 at 17:20, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
> This pair of patches converts the way frames gets created from
> using PUSHes/POPs to using MOVes, thus allowing (in certain
> cases) to avoid saving/restoring part of the register set.
> 
> While the exact place where the (small) win from this comes from
> varies between CPUs, the net effect is a 1 to 2% reduction on a
> combined interruption entry and exit when the full state save
> can be avoided.
> 
> 1: use MOV instead of PUSH/POP when saving/restoring register state
> 2: save only partial register state where possible
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Keir Fraser <keir@xxxxxxx>

> ---
> NB: Patch 1 didn't change from its v1 submission, and what was
> originally patch 2 (of 3) did already get committed.
> 
> 
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> http://lists.xen.org/xen-devel



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