From: Marc Zyngier <marc.zyngier@arm.com>
To: Itaru Kitayama <itaru.kitayama@riken.jp>
Cc: kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH] updated: arm64: KVM: vgic: deal with GIC sub-page alignment
Date: Sat, 9 Jul 2016 21:09:01 +0100 [thread overview]
Message-ID: <20160709210901.6fea00e8@arm.com> (raw)
In-Reply-To: <543776d0-fa4b-3105-a6f4-de3df847b9a7@riken.jp>
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.
next prev parent reply other threads:[~2016-07-09 20:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-01 4:57 [PATCH] updated: arm64: KVM: vgic: deal with GIC sub-page alignment Itaru Kitayama
2016-07-01 8:40 ` Marc Zyngier
2016-07-01 8:59 ` Itaru Kitayama
2016-07-01 9:20 ` Marc Zyngier
2016-07-09 0:27 ` Itaru Kitayama
2016-07-09 0:34 ` Itaru Kitayama
2016-07-09 10:08 ` Marc Zyngier
2016-07-09 10:32 ` Itaru Kitayama
2016-07-09 20:09 ` Marc Zyngier [this message]
2016-07-10 6:49 ` Itaru Kitayama
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