From: Changbin Du <changbin.du@gmail.com>
To: Jiri Olsa <jolsa@redhat.com>, Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Namhyung Kim <namhyung@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
linux-kernel@vger.kernel.org, Changbin Du <changbin.du@gmail.com>
Subject: [PATCH v8 02/18] perf ftrace: add option '-F/--funcs' to list available functions
Date: Sat, 8 Aug 2020 10:31:25 +0800 [thread overview]
Message-ID: <20200808023141.14227-3-changbin.du@gmail.com> (raw)
In-Reply-To: <20200808023141.14227-1-changbin.du@gmail.com>
This adds an option '-F/--funcs' to list all available functions to trace,
which is read from tracing file 'available_filter_functions'.
$ sudo ./perf ftrace -F | head
trace_initcall_finish_cb
initcall_blacklisted
do_one_initcall
do_one_initcall
trace_initcall_start_cb
run_init_process
try_to_run_init_process
match_dev_by_label
match_dev_by_uuid
rootfs_init_fs_context
Signed-off-by: Changbin Du <changbin.du@gmail.com>
---
v3: fix return value issue.
v2: option name '-l/--list-functions' -> '-F/--funcs'
---
tools/perf/Documentation/perf-ftrace.txt | 4 +++
tools/perf/builtin-ftrace.c | 46 ++++++++++++++++++++++++
2 files changed, 50 insertions(+)
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt
index 821d4d334a09..4f5628445a63 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -31,6 +31,10 @@ OPTIONS
--verbose=::
Verbosity level.
+-F::
+--funcs::
+ List all available functions to trace.
+
-p::
--pid=::
Trace on existing process id (comma separated list).
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 048a11192b59..1ebf71ecc1a8 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -33,6 +33,7 @@ struct perf_ftrace {
struct evlist *evlist;
struct target target;
const char *tracer;
+ bool list_avail_functions;
struct list_head filters;
struct list_head notrace;
struct list_head graph_funcs;
@@ -128,6 +129,46 @@ static int append_tracing_file(const char *name, const char *val)
return __write_tracing_file(name, val, true);
}
+static int read_tracing_file_to_stdout(const char *name)
+{
+ char buf[4096];
+ char *file;
+ int fd;
+ int ret = -1;
+
+ file = get_tracing_file(name);
+ if (!file) {
+ pr_debug("cannot get tracing file: %s\n", name);
+ return -1;
+ }
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0) {
+ pr_debug("cannot open tracing file: %s: %s\n",
+ name, str_error_r(errno, buf, sizeof(buf)));
+ goto out;
+ }
+
+ /* read contents to stdout */
+ while (true) {
+ int n = read(fd, buf, sizeof(buf));
+ if (n == 0)
+ break;
+ else if (n < 0)
+ goto out_close;
+
+ if (fwrite(buf, n, 1, stdout) != 1)
+ goto out_close;
+ }
+ ret = 0;
+
+out_close:
+ close(fd);
+out:
+ put_tracing_file(file);
+ return ret;
+}
+
static int reset_tracing_cpu(void);
static void reset_tracing_filters(void);
@@ -302,6 +343,9 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
signal(SIGCHLD, sig_handler);
signal(SIGPIPE, sig_handler);
+ if (ftrace->list_avail_functions)
+ return read_tracing_file_to_stdout("available_filter_functions");
+
if (reset_tracing_files(ftrace) < 0) {
pr_err("failed to reset ftrace\n");
goto out;
@@ -487,6 +531,8 @@ int cmd_ftrace(int argc, const char **argv)
const struct option ftrace_options[] = {
OPT_STRING('t', "tracer", &ftrace.tracer, "tracer",
"tracer to use: function_graph(default) or function"),
+ OPT_BOOLEAN('F', "funcs", &ftrace.list_avail_functions,
+ "Show available functions to filter"),
OPT_STRING('p', "pid", &ftrace.target.pid, "pid",
"trace on existing process id"),
OPT_INCR('v', "verbose", &verbose,
--
2.25.1
next prev parent reply other threads:[~2020-08-08 2:32 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-08 2:31 [PATCH v8 00/18] [PATCH v7 00/18] perf: ftrace enhancement Changbin Du
2020-08-08 2:31 ` [PATCH v8 01/18] perf ftrace: select function/function_graph tracer automatically Changbin Du
2020-08-08 2:31 ` Changbin Du [this message]
2020-08-14 11:35 ` [PATCH v8 02/18] perf ftrace: add option '-F/--funcs' to list available functions Arnaldo Carvalho de Melo
2020-08-20 15:18 ` Changbin Du
2020-08-08 2:31 ` [PATCH v8 03/18] perf ftrace: factor out function write_tracing_file_int() Changbin Du
2020-08-08 2:31 ` [PATCH v8 04/18] perf ftrace: add option '-m/--buffer-size' to set per-cpu buffer size Changbin Du
2020-08-14 11:53 ` Arnaldo Carvalho de Melo
2020-08-14 12:12 ` Arnaldo Carvalho de Melo
2020-08-14 12:58 ` Arnaldo Carvalho de Melo
2020-08-08 2:31 ` [PATCH v8 05/18] perf ftrace: show trace column header Changbin Du
2020-08-14 11:56 ` Arnaldo Carvalho de Melo
2020-08-14 11:57 ` Arnaldo Carvalho de Melo
2020-08-08 2:31 ` [PATCH v8 06/18] perf ftrace: add option '--inherit' to trace children processes Changbin Du
2020-08-14 12:12 ` Arnaldo Carvalho de Melo
2020-08-08 2:31 ` [PATCH v8 07/18] perf: util: add general function to parse sublevel options Changbin Du
2020-08-08 2:31 ` [PATCH v8 08/18] perf ftrace: add support for tracing option 'func_stack_trace' Changbin Du
2020-08-14 12:24 ` Arnaldo Carvalho de Melo
2020-08-20 15:15 ` Changbin Du
2020-08-08 2:31 ` [PATCH v8 09/18] perf ftrace: add support for trace option sleep-time Changbin Du
2020-08-14 12:26 ` Arnaldo Carvalho de Melo
2020-08-08 2:31 ` [PATCH v8 10/18] perf ftrace: add support for trace option funcgraph-irqs Changbin Du
2020-08-14 12:27 ` Arnaldo Carvalho de Melo
2020-08-08 2:31 ` [PATCH v8 11/18] perf ftrace: add support for tracing option 'irq-info' Changbin Du
2020-08-14 12:28 ` Arnaldo Carvalho de Melo
2020-08-20 15:09 ` Changbin Du
2020-08-08 2:31 ` [PATCH v8 12/18] perf ftrace: add option 'verbose' to show more info for graph tracer Changbin Du
2020-08-08 2:31 ` [PATCH v8 13/18] perf ftrace: add support for trace option tracing_thresh Changbin Du
2020-08-14 12:33 ` Arnaldo Carvalho de Melo
2020-08-20 15:08 ` Changbin Du
2020-08-08 2:31 ` [PATCH v8 14/18] perf: ftrace: allow set graph depth by '--graph-opts' Changbin Du
2020-08-08 2:31 ` [PATCH v8 15/18] perf ftrace: add option -D/--delay to delay tracing Changbin Du
2020-08-08 2:31 ` [PATCH v8 16/18] perf ftrace: add option --tid to filter by thread id Changbin Du
2020-08-08 2:31 ` [PATCH v8 17/18] perf: ftrace: Add set_tracing_options() to set all trace options Changbin Du
2020-08-08 2:31 ` [PATCH v8 18/18] perf ftrace: add change log Changbin Du
2020-08-14 12:38 ` [PATCH v8 00/18] [PATCH v7 00/18] perf: ftrace enhancement Arnaldo Carvalho de Melo
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