linux-kernel - Re: [PATCH 3/3] perf, x86, lbr: Demand proper privileges for PERF_SAMPLE_BRANCH

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Date:	Thu, 16 May 2013 13:16:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michael Neuling <mikey@...ling.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>, michael@...erman.id.au,
	benh@...nel.crashing.org, Linux PPC dev <linuxppc-dev@...abs.org>
Subject: Re: [PATCH 3/3] perf, x86, lbr: Demand proper privileges for
 PERF_SAMPLE_BRANCH_KERNEL

On Thu, May 16, 2013 at 08:15:17PM +1000, Michael Neuling wrote:
> Peter,
> 
> BTW PowerPC also has the ability to filter on conditional branches.  Any
> chance we could add something like the follow to perf also?
> 

I don't see an immediate problem with that except that we on x86 need to
implement that in the software filter. Stephane do you see any
fundamental issue with that?

> 
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index fb104e5..891c769 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_CONDITIONAL  = 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 \
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index cdf58ec..5b0b89d 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -676,6 +676,7 @@ static const struct branch_mode branch_modes[] = {
>  	BRANCH_OPT("any_call", PERF_SAMPLE_BRANCH_ANY_CALL),
>  	BRANCH_OPT("any_ret", PERF_SAMPLE_BRANCH_ANY_RETURN),
>  	BRANCH_OPT("ind_call", PERF_SAMPLE_BRANCH_IND_CALL),
> +	BRANCH_OPT("cnd", PERF_SAMPLE_BRANCH_CONDITIONAL),
>  	BRANCH_END
>  };
>  
--
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