Re: [PATCH] updated: arm64: KVM: vgic: deal with GIC sub-page alignment

[Marc Zyngier <marc.zyngier@arm.com>]

On Sat, 9 Jul 2016 19:32:35 +0900
Itaru Kitayama <itaru.kitayama@riken.jp> wrote:

> On 7/9/16 7:08 PM, Marc Zyngier wrote:
> > Please realize that this is a work in progress, and that I'm not even
> > sure I want to upstream this.  
> 
> OK.
> 
> >> (I wanted to get some performance statistics of the new feature with
> >> perf, but on arm64 most of them are unsupported)  
> >
> > Care to mention which ones are missing?  
> 
> $ perf stat sleep 5
> 
>   Performance counter stats for 'sleep 5':
> 
>            0.589480      task-clock:u (msec)       #    0.000 CPUs 
> utilized
>                   0      context-switches:u        #    0.000 K/sec 
> 
>                   0      cpu-migrations:u          #    0.000 K/sec 
> 
>                  35      page-faults:u             #    0.059 M/sec 
> 
>     <not supported>      cycles:u 
> 
>     <not supported>      instructions:u 
> 
>     <not supported>      branches:u 
> 
>     <not supported>      branch-misses:u 
> 
> 
>         5.024683421 seconds time elapsed
> 
> Userland is Fedora 24.

I'm pretty sure your QEMU doesn't have PMU support. Can you show the
PMU probe messages in the guest? And/or dump the guest DTB?

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny.