linux-kernel - Re: [PATCH 21/25] perf evsel: Skip ignored symbols while printing callchain

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Date:	Tue, 26 Nov 2013 12:52:21 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	David Ahern <dsahern@...il.com>
CC:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 21/25] perf evsel: Skip ignored symbols while printing
 callchain

On 25/11/13 16:17, Arnaldo Carvalho de Melo wrote:
> From: David Ahern <dsahern@...il.com>
> 
> Allows a command to have a symbol_filter controlled by the user to skip
> certain functions in a backtrace. One example is to allow the user to
> reduce repeating patterns like:
> 
>     do_select  core_sys_select  sys_select
> 
> to just sys_select when dumping callchains, consuming less real estate
> on the screen while still conveying the essential message - the process
> is in a select call.
> 
> This option is leveraged by the upcoming timehist command.
> 
> Signed-off-by: David Ahern <dsahern@...il.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Stephane Eranian <eranian@...gle.com>
> Link: http://lkml.kernel.org/r/1384806771-2945-2-git-send-email-dsahern@gmail.com
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/perf/util/session.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index f36d24a02445..948f7644b4d9 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1522,6 +1522,9 @@ void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
>  			if (!node)
>  				break;
>  
> +			if (node->sym && node->sym->ignore)
> +				goto next;
> +
>  			if (print_ip)
>  				printf("%c%16" PRIx64, s, node->ip);
>  
> @@ -1544,12 +1547,15 @@ void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
>  			if (!print_oneline)
>  				printf("\n");
>  
> -			callchain_cursor_advance(&callchain_cursor);
> -
>  			stack_depth--;
> +next:
> +			callchain_cursor_advance(&callchain_cursor);
>  		}
>  
>  	} else {
> +		if (al.sym->ignore)

Seems to segfault here because sym is null

> +			return;
> +
>  		if (print_ip)
>  			printf("%16" PRIx64, sample->ip);
>  
> 

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