From: Peipei Wang <wangpeipei.90@gmail.com>
To: perf group <linux-perf-users@vger.kernel.org>
Subject: Can perf be used to record cycles or instructions on Virtual Machine
Date: Wed, 26 Jun 2013 15:13:42 -0400 [thread overview]
Message-ID: <CAEuYUeoCAOJAP4xvKWsFf4e-VJ0BuooO=i8_1qadva-1YFii5w@mail.gmail.com> (raw)
Hi, all.
I got a new problem.
When I use perf to get CPI( cycles per instruction) on a Virtual
Machine, I receive the message that
cycles and instructions are not supported.
However, other events like page-faults or context-switches can be
supported well.
I don't know why. So I guess I can't user perf to record a certain
sort of performance events on Virtual Machine.
Is my guess correct?? What kind of performance events in hell aren't
supported?
Thanks for all your help.
Yours,
Wang Peipei
next reply other threads:[~2013-06-26 19:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-26 19:13 Peipei Wang [this message]
2013-06-26 19:20 ` Can perf be used to record cycles or instructions on Virtual Machine David Ahern
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