[PATCH v2] KVM: PPC: e500mc: Enhance tlb invalidation condition on vcpu schedule

[mihai.caraman at freescale.com]

> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Tuesday, June 17, 2014 6:36 PM
> To: Caraman Mihai Claudiu-B02008
> Cc: kvm-ppc at vger.kernel.org; kvm at vger.kernel.org; linuxppc-
> dev at lists.ozlabs.org
> Subject: Re: [PATCH v2] KVM: PPC: e500mc: Enhance tlb invalidation
> condition on vcpu schedule
> 
> On Tue, 2014-06-17 at 12:02 +0300, Mihai Caraman wrote:
> > On vcpu schedule, the condition checked for tlb pollution is too loose.
> > The tlb entries of a vcpu become polluted (vs stale) only when a
> different
> > vcpu within the same logical partition runs in-between. Optimize the
> tlb
> > invalidation condition taking into account the logical partition id.
> >
> > With the new invalidation condition, a guest shows 4% performance
> improvement
> > on P5020DS while running a memory stress application with the cpu
> oversubscribed,
> > the other guest running a cpu intensive workload.
> 
> See
> https://lists.ozlabs.org/pipermail/linuxppc-dev/2014-June/118547.html

Thanks. The original code needs just a simple adjustment to benefit from
this optimization, please review v3.

- Mike