From: Joerg Roedel <joro@8bytes.org>
To: Stephane Eranian <eranian@google.com>
Cc: David Ahern <dsahern@gmail.com>,
linux-kernel@vger.kernel.org, acme@redhat.com,
robert.richter@amd.com, peterz@infradead.org, mingo@elte.hu,
gleb@redhat.com, joerg.roedel@amd.com
Subject: Re: [PATCH] perf tools: fix guest mode monitoring on AMD
Date: Mon, 27 Feb 2012 19:23:25 +0100 [thread overview]
Message-ID: <20120227182325.GA12302@8bytes.org> (raw)
In-Reply-To: <CABPqkBRUzp-gBANhiMerHanN7yaTnJbxHNEjz_mw+XRYT8ZHUw@mail.gmail.com>
On Mon, Feb 27, 2012 at 06:52:25PM +0100, Stephane Eranian wrote:
> Yeah, but that causes simple commands such as "perf stat -e cycles ls"
> to return 0 count.
>
> So either you get a segfault or you get zero count. There is something
> else going on here...
Hmm, looks like the counters will not do any counting when EFER.SVME==0
and HO==1 or GO==1 is set in the counters :(
A solution would be to mask out these bits in the perf-ctrl register
when EFER.SVME=0
I'll try to come up with a fix soon.
Joerg
next prev parent reply other threads:[~2012-02-27 18:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-27 17:33 [PATCH] perf tools: fix guest mode monitoring on AMD Stephane Eranian
2012-02-27 17:39 ` Gleb Natapov
2012-02-27 17:47 ` David Ahern
2012-02-27 17:52 ` Stephane Eranian
2012-02-27 18:00 ` David Ahern
2012-02-27 18:23 ` Joerg Roedel [this message]
2012-02-28 15:55 ` [PATCH] perf/x86: Fix HO/GO counting with SVM disabled Joerg Roedel
2012-02-28 17:24 ` Avi Kivity
2012-02-28 17:36 ` David Ahern
2012-02-28 17:38 ` Avi Kivity
2012-02-29 13:24 ` Joerg Roedel
2012-02-29 13:57 ` [PATCH v2] " Joerg Roedel
2012-02-29 17:00 ` Avi Kivity
2012-02-29 17:03 ` Gleb Natapov
2012-02-29 17:05 ` Joerg Roedel
2012-02-29 17:08 ` Avi Kivity
2012-02-29 17:24 ` Peter Zijlstra
2012-02-29 17:44 ` Peter Zijlstra
2012-03-02 14:54 ` [tip:perf/urgent] perf/x86/kvm: Fix Host-Only/ Guest-Only " tip-bot for Joerg Roedel
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