linux-kernel - Re: perf user tool precise attribute broken in 3.5rc1+

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Message-ID: <CABPqkBQ99PTsET6c_NPuioLUr_yto4x=6EBQ1K73N4ratHz48A@mail.gmail.com>
Date:	Thu, 7 Jun 2012 22:53:19 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...hat.com, jolsa@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: perf user tool precise attribute broken in 3.5rc1+

On Thu, Jun 7, 2012 at 10:23 PM, Andi Kleen <andi@...stfloor.org> wrote:
>
> With a perf user tool compiled from a 3.5rc1+ kernel I cannot
> use the 'p' attribute anymore. Always get
>
> ak@...rock:~> ./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.

> ./t: Terminated
>
> With an older perf it works, so the kernel is ok.
>
> ak@...rock:~> ./perf record -e cycles:p ./t
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.005 MB perf.data (~217 samples) ]
> ak@...rock:~>
>
>
> -Andi
> --
> ak@...ux.intel.com -- Speaking for myself only.
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