linux-kernel - Re: [PATCH 1/5] perf: New conditional branch filter criteria in branch stack sampling

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Message-ID: <CABPqkBQqH7vz9Qgom=heL6N3JniFeZKciGbQfR0PjuK-NVA0-A@mail.gmail.com>
Date:	Thu, 23 May 2013 15:36:32 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:	Linux PPC dev <linuxppc-dev@...abs.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Michael Neuling <mikey@...ling.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 1/5] perf: New conditional branch filter criteria in
 branch stack sampling

On Wed, May 22, 2013 at 8:22 AM, Anshuman Khandual
<khandual@...ux.vnet.ibm.com> wrote:
> POWER8 PMU based BHRB supports filtering for conditional branches.
> This patch introduces new branch filter PERF_SAMPLE_BRANCH_COND which
> will extend the existing perf ABI. Other architectures can provide
> this functionality with either HW filtering support (if present) or
> with SW filtering of instructions.
>
Reviewed-by: Stephane Eranian <eranian@...gle.com>

> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
> ---
>  include/uapi/linux/perf_event.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index fb104e5..cb0de86 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -157,8 +157,9 @@ enum perf_branch_sample_type {
>         PERF_SAMPLE_BRANCH_ANY_CALL     = 1U << 4, /* any call branch */
>         PERF_SAMPLE_BRANCH_ANY_RETURN   = 1U << 5, /* any return branch */
>         PERF_SAMPLE_BRANCH_IND_CALL     = 1U << 6, /* indirect calls */
> +       PERF_SAMPLE_BRANCH_COND         = 1U << 7, /* conditional branches */
>
> -       PERF_SAMPLE_BRANCH_MAX          = 1U << 7, /* non-ABI */
> +       PERF_SAMPLE_BRANCH_MAX          = 1U << 8, /* non-ABI */
>  };
>
>  #define PERF_SAMPLE_BRANCH_PLM_ALL \
> --
> 1.7.11.7
>
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