linux-kernel - Re: [PATCH -tip v3 3/5] perf script: enhance IP and ADDR correlate detection for BTS

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Message-ID: <4E5252DA.3050307@gmail.com>
Date:	Mon, 22 Aug 2011 07:00:10 -0600
From:	David Ahern <dsahern@...il.com>
To:	Akihiro Nagai <akihiro.nagai.hw@...achi.com>
CC:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	yrl.pp-manager.tt@...achi.com, Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH -tip v3 3/5] perf script: enhance IP and ADDR correlate
 detection for BTS



On 08/11/2011 06:06 AM, Akihiro Nagai wrote:
> BTS records branch_from_addr and branch_to_addr in IP and ADDR field in perf_sample.
> This patch detects this correlation in perf-script.
> 
> # perf script -f ip,addr,dso,sym
> 3f03e016b0    _start (/lib64/ld-2.14.so) ffffffff814675d2 irq_return ([kernel.kallsyms])
> 3f03e016b0    _start (/lib64/ld-2.14.so) ffffffff814675d2 irq_return ([kernel.kallsyms])
> 3f03e04b80 _dl_start (/lib64/ld-2.14.so)       3f03e016b3     _start (/lib64/ld-2.14.so)
> 3f03e04b80 _dl_start (/lib64/ld-2.14.so) ffffffff814675d2 irq_return ([kernel.kallsyms])
> 3f03e04ba6 _dl_start (/lib64/ld-2.14.so) ffffffff814675d2 irq_return ([kernel.kallsyms])
> 3f03e04bad _dl_start (/lib64/ld-2.14.so) ffffffff814675d2 irq_return ([kernel.kallsyms])
> 3f03e04c1d _dl_start (/lib64/ld-2.14.so)       3f03e04bfb  _dl_start (/lib64/ld-2.14.so)
> [snip]
> 
> Signed-off-by: Akihiro Nagai <akihiro.nagai.hw@...achi.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Arnaldo Carvalho de Melo <acme@...radead.org>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> ---
> 
>  tools/perf/builtin-script.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index b3312ff..aeec5bc 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -309,6 +309,12 @@ static bool sample_addr_correlates_sym(struct perf_event_attr *attr)
>  	     (attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ)))
>  		return true;
>  
> +	/* BTS Events */
> +	if ((attr->type == PERF_TYPE_HARDWARE) &&
> +	    (attr->config & PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
> +	    (attr->sample_period == 1))
> +		return true;
> +
>  	return false;
>  }
>  
> 

Acked-By: David Ahern <dsahern@...il.com>
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