linux-kernel - Re: [PATCH 3/5] perf annotate: don't pipe objdump output through grep

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Message-ID: <20191014141947.GH19627@kernel.org>
Date:   Mon, 14 Oct 2019 11:19:47 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Song Liu <songliubraving@...com>, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 3/5] perf annotate: don't pipe objdump output through grep

Em Thu, Oct 10, 2019 at 11:36:47AM -0700, Ian Rogers escreveu:
> Simplify the objdump command by not piping the output of objdump through
> grep. Instead, drop lines that match the grep pattern during the reading
> loop.

Thanks, applied and tested.

- Arnaldo
 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/annotate.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index fc12c5cfe112..0a7a6f3c55f4 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -1894,7 +1894,7 @@ static int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
>  	err = asprintf(&command,
>  		 "%s %s%s --start-address=0x%016" PRIx64
>  		 " --stop-address=0x%016" PRIx64
> -		 " -l -d %s %s -C \"$1\" 2>/dev/null|grep -v \"$1:\"|expand",
> +		 " -l -d %s %s -C \"$1\" 2>/dev/null|expand",
>  		 opts->objdump_path ?: "objdump",
>  		 opts->disassembler_style ? "-M " : "",
>  		 opts->disassembler_style ?: "",
> @@ -1940,9 +1940,16 @@ static int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
>  
>  	nline = 0;
>  	while (!feof(file)) {
> +		const char *match;
> +
>  		if (getline(&line, &line_len, file) < 0 || !line)
>  			break;
>  
> +		/* Skip lines containing "filename:" */
> +		match = strstr(line, symfs_filename);
> +		if (match && match[strlen(symfs_filename)] == ':')
> +			continue;
> +
>  		/*
>  		 * The source code line number (lineno) needs to be kept in
>  		 * across calls to symbol__parse_objdump_line(), so that it
> -- 
> 2.23.0.581.g78d2f28ef7-goog

-- 

- Arnaldo