From: Gleb Natapov <gleb@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
David Ahern <dsahern@gmail.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: perf with precise attribute kills all KVM based VMs
Date: Mon, 9 Jul 2012 17:57:14 +0300 [thread overview]
Message-ID: <20120709145714.GF7298@redhat.com> (raw)
In-Reply-To: <20120709145442.GE7298@redhat.com>
On Mon, Jul 09, 2012 at 05:54:42PM +0300, Gleb Natapov wrote:
> On Mon, Jul 09, 2012 at 05:51:29PM +0300, Avi Kivity wrote:
> > On 07/09/2012 05:49 PM, Peter Zijlstra wrote:
> > > On Mon, 2012-07-09 at 08:47 -0600, David Ahern wrote:
> > >>
> > >> I found this testing changes to perf-kvm, but found the problem extends
> > >> to just perf-record. With perf-record exclude_guest defaults to 1. See
> > >> tools/perf/util/util.c, event_attr_init().
> > >
> > > You lost me there.. so perf-record defaults to exclude_guest=1 (which
> > > would make the proposed patch I just send actually possible), but its
> > > still going *bang* ?
> >
> > It's possible that the DS writes overshoot the MSR... or that there's a
> > bug somewhere.
> >
> I hope it is the later, because we can do nothing with the former.
>
Actually we can disable DS before guest entry.
--
Gleb.
next prev parent reply other threads:[~2012-07-09 14:57 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-09 14:12 perf with precise attribute kills all KVM based VMs David Ahern
2012-07-09 14:19 ` Gleb Natapov
2012-07-09 14:24 ` Peter Zijlstra
2012-07-09 14:36 ` Gleb Natapov
2012-07-09 14:39 ` Avi Kivity
2012-07-09 14:47 ` David Ahern
2012-07-09 14:49 ` Peter Zijlstra
2012-07-09 14:51 ` Avi Kivity
2012-07-09 14:54 ` Gleb Natapov
2012-07-09 14:57 ` Gleb Natapov [this message]
2012-07-09 14:59 ` Peter Zijlstra
2012-07-10 23:38 ` David Ahern
2012-07-11 7:10 ` Gleb Natapov
2012-07-11 9:49 ` Peter Zijlstra
2012-07-11 9:53 ` Gleb Natapov
2012-07-11 13:34 ` David Ahern
2012-07-12 4:11 ` David Ahern
2012-07-12 4:29 ` Gleb Natapov
2012-07-12 15:20 ` David Ahern
2012-07-12 16:06 ` Gleb Natapov
2012-07-12 16:13 ` Gleb Natapov
2012-07-12 16:58 ` Peter Zijlstra
2012-07-16 1:51 ` David Ahern
2012-07-15 8:07 ` Avi Kivity
2012-07-15 13:00 ` David Ahern
2012-07-15 13:03 ` Avi Kivity
2012-07-16 1:52 ` David Ahern
2012-07-16 2:19 ` David Ahern
2012-07-20 23:34 ` David Ahern
2012-07-22 9:52 ` Avi Kivity
2012-07-09 14:52 ` David Ahern
2012-07-09 14:58 ` David Ahern
2012-07-09 15:18 ` David Ahern
2012-07-09 14:47 ` Peter Zijlstra
2012-07-20 23:35 ` David Ahern
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