Commit 42145d71 authored by Changbin Du's avatar Changbin Du Committed by Arnaldo Carvalho de Melo
Browse files

perf ftrace: Add option --tid to filter by thread id 



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

Signed-off-by: default avatarChangbin Du <changbin.du@gmail.com>
Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: http://lore.kernel.org/lkml/20200808023141.14227-17-changbin.du@gmail.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 6555c2f6

tools/perf/Documentation/perf-ftrace.txt

+3 −0
Original line number Diff line number Diff line
@@ -39,6 +39,9 @@ OPTIONS 
--pid=::

	Trace on existing process id (comma separated list).



--tid=::

	Trace on existing thread id (comma separated list).



-D::

--delay::

	Time (ms) to wait before starting tracing after program start.

tools/perf/builtin-ftrace.c

+3 −0
Original line number Diff line number Diff line
@@ -812,6 +812,9 @@ 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"),

	/* TODO: Add short option -t after -t/--tracer can be removed. */

	OPT_STRING(0, "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,

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