linux-kernel - [PATCH 16/19] perf ftrace: add option -t/--tid to filter by thread id

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Date:   Sun, 10 May 2020 23:06:25 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, Changbin Du <changbin.du@...il.com>
Subject: [PATCH 16/19] perf ftrace: add option -t/--tid to filter by thread id

This allows us to trace single thread instead of the whole process.

Signed-off-by: Changbin Du <changbin.du@...il.com>
---
 tools/perf/builtin-ftrace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 0b39b6a88026..8d04e5afe2d3 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -707,6 +707,8 @@ int cmd_ftrace(int argc, const char **argv)
 		    "List available functions to filter"),
 	OPT_STRING('p', "pid", &ftrace.target.pid, "pid",
 		   "trace on existing process id"),
+	OPT_STRING('t', "tid", &ftrace.target.tid, "tid",
+		   "trace on existing thread id (exclusive to --pid)"),
 	OPT_INCR('v', "verbose", &verbose,
 		 "be more verbose"),
 	OPT_BOOLEAN('a', "all-cpus", &ftrace.target.system_wide,
-- 
2.25.1