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Subject[PATCH v4 03/17] perf ftrace: add option -t/--tid to filter by thread id
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This allows us to trace single thread instead of the whole process.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
---
tools/perf/Documentation/perf-ftrace.txt | 4 ++++
tools/perf/builtin-ftrace.c | 2 ++
2 files changed, 6 insertions(+)

diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt
index d79560dea19f..e204bf6d50d8 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -38,6 +38,10 @@ OPTIONS
--pid=::
Trace on existing process id (comma separated list).

+-t::
+--tid=::
+ Trace on existing thread id (comma separated list).
+
-a::
--all-cpus::
Force system-wide collection. Scripts run without a <command>
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 244cc8e6bd60..1188b82c6541 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -515,6 +515,8 @@ int cmd_ftrace(int argc, const char **argv)
"Show 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
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