Re: [PATCH] Enhance perf to collect KVM guest os statistics from host side

Ingo Molnar
2010-03-17T08:59:00Z

* Avi Kivity <avi@redhat.com> wrote:

> On 03/17/2010 10:16 AM, Ingo Molnar wrote:
> >* Avi Kivity<avi@redhat.com> wrote:
> >
> >> Monitoring guests from the host is useful for kvm developers, but less so
> >> for users.
> >
> > Guest space profiling is easy, and 'perf kvm' is not about that. (plain
> > 'perf' will work if a proper paravirt channel is opened to the host)
> >
> > I think you might have misunderstood the purpose and role of the 'perf
> > kvm' patch here? 'perf kvm' is aimed at KVM developers: it is them who
> > improve KVM code, not guest kernel users.
>
> Of course I understood it. My point was that 'perf kvm' serves a tiny
> minority of users. [...]

I hope you wont be disappointed to learn that 100% of Linux, all 13+ million
lines of it, was and is being developed by a tiny, tiny, tiny minority of
users ;-)

> [...] That doesn't mean it isn't useful, just that it doesn't satisfy all
> needs by itself.

Of course - and it doesnt bring world peace either. One step at a time.

Thanks,

Ingo