Date: Thu, 7 Jun 2012 18:28:00 -0300
From: Arnaldo Carvalho de Melo <acme@redhat.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Stephane Eranian <eranian@google.com>, jolsa@redhat.com,
        linux-kernel@vger.kernel.org
Subject: Re: perf user tool precise attribute broken in 3.5rc1+
Message-ID: <20120607212759.GD30641@infradead.org>
References: <20120607202355.GQ27374@one.firstfloor.org>
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 <20120607205836.GT27374@one.firstfloor.org>
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Em Thu, Jun 07, 2012 at 10:58:36PM +0200, Andi Kleen escreveu:
> On Thu, Jun 07, 2012 at 10:53:19PM +0200, Stephane Eranian wrote:
> > On Thu, Jun 7, 2012 at 10:23 PM, Andi Kleen <andi@firstfloor.org> wrote:
> > >
> > > With a perf user tool compiled from a 3.5rc1+ kernel I cannot
> > > use the 'p' attribute anymore. Always get
> > >
> > > ak@petrock:~> ./perf record -e cycles:p ./t
> > >
> > > ?Error: sys_perf_event_open() syscall returned with 22 (Invalid argument). ?/bin/dmesg may provide additional information.
> > >
> > > ?Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?
> > >
> > Remember that PEBS is disabled on SNB unless you have the new ucode + my patch.
> 
> This is not the problem. This was actually a -E where it was not disabled
> in my tree.  And the older perf binary works, so it's clearly not a kernel 
> problem.

Are you sure the old one works? Perhaps it silently falls back to
cpu-clock?

What 'perf evlist -v' says?

- Arnaldo
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