From: Jiri Olsa <jolsa@redhat.com>
To: Nikolay Borisov <kernel@kyup.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
"Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>,
andi@firstfloor.org
Subject: Re: Strange behavior of perf top with PEBS
Date: Wed, 20 Jul 2016 16:34:17 +0200 [thread overview]
Message-ID: <20160720143417.GA25992@krava> (raw)
In-Reply-To: <578F7C82.6090500@kyup.com>
On Wed, Jul 20, 2016 at 04:28:34PM +0300, Nikolay Borisov wrote:
> Hello,
>
> Running perf version 4.4.14.g0cb188d (no modification to the PMU/perf
> code) I observed that "perf top" counts no cycles and produces no
> output. After a bit of head scratching and testing I figured that
> running "perf top -e cycles" actually works whereas the default option
> is equivalent to running "perf top -e cycles:p". So the latter version
> seems to not work on my machine.
hum, I think Core2 has PEBs valid only for instructions not cycles..
I'll check why perf top forcing the precise for cycles
I thought we had that automated already
jirka
next prev parent reply other threads:[~2016-07-20 14:34 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-20 13:28 Strange behavior of perf top with PEBS Nikolay Borisov
2016-07-20 14:34 ` Jiri Olsa [this message]
2016-07-20 14:36 ` Nikolay Borisov
2016-07-20 14:38 ` Jiri Olsa
2016-07-26 11:30 ` Nikolay Borisov
2016-08-04 15:29 ` Jiri Olsa
2016-08-05 9:30 ` Nikolay Borisov
2016-08-05 10:23 ` Jiri Olsa
2016-08-08 13:03 ` Peter Zijlstra
2016-08-08 13:19 ` Greg Kroah-Hartman
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