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

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Date:   Thu, 10 Oct 2019 11:36:47 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        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
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH 3/5] perf annotate: don't pipe objdump output through grep

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.

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