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 v5 02/17] perf ftrace: add option '-F/--funcs' to list available functions
Date: Sat, 11 Jul 2020 20:40:20 +0800 [thread overview]
Message-ID: <20200711124035.6513-3-changbin.du@gmail.com> (raw)
In-Reply-To: <20200711124035.6513-1-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>
---
v2: option name '-l/--list-functions' -> '-F/--funcs'
---
tools/perf/Documentation/perf-ftrace.txt | 4 +++
tools/perf/builtin-ftrace.c | 43 ++++++++++++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt
index 952e46669168..d79560dea19f 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -30,6 +30,10 @@ 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 5f53da87040d..244cc8e6bd60 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -32,6 +32,7 @@ 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;
@@ -127,6 +128,43 @@ 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)
+ 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);
@@ -301,6 +339,9 @@ 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;
@@ -470,6 +511,8 @@ int cmd_ftrace(int argc, const char **argv)
const struct option ftrace_options[] = {
OPT_STRING('t', "tracer", &ftrace.tracer, "tracer",
"tracer to use: function or function_graph (This option is deprecated)"),
+ 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:[~2020-07-11 12:42 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-11 12:40 [PATCH v5 00/17] perf: ftrace enhancement Changbin Du
2020-07-11 12:40 ` [PATCH v5 01/17] perf ftrace: select function/function_graph tracer automatically Changbin Du
2020-07-11 12:40 ` Changbin Du [this message]
2020-07-13 1:49 ` [PATCH v5 02/17] perf ftrace: add option '-F/--funcs' to list available functions Namhyung Kim
2020-07-16 15:21 ` Arnaldo Carvalho de Melo
2020-07-17 13:58 ` Changbin Du
2020-07-17 15:05 ` Steven Rostedt
2020-07-17 16:21 ` Arnaldo Carvalho de Melo
2020-07-17 16:27 ` Steven Rostedt
2020-07-17 16:37 ` Arnaldo Carvalho de Melo
2020-07-18 7:06 ` Changbin Du
2020-07-17 17:39 ` Ian Rogers
2020-07-11 12:40 ` [PATCH v5 03/17] perf ftrace: add option -t/--tid to filter by thread id Changbin Du
2020-07-16 15:36 ` Arnaldo Carvalho de Melo
2020-07-17 13:26 ` Changbin Du
2020-07-17 16:44 ` Arnaldo Carvalho de Melo
2020-07-17 17:01 ` Steven Rostedt
2020-07-17 17:40 ` Arnaldo Carvalho de Melo
2020-07-17 17:53 ` Steven Rostedt
2020-07-17 19:34 ` Arnaldo Carvalho de Melo
2020-07-17 19:44 ` Steven Rostedt
2020-07-21 13:44 ` Namhyung Kim
2020-07-18 5:47 ` Changbin Du
2020-07-11 12:40 ` [PATCH v5 04/17] perf ftrace: factor out function write_tracing_file_int() Changbin Du
2020-07-11 12:40 ` [PATCH v5 05/17] perf ftrace: add option '-m/--buffer-size' to set per-cpu buffer size Changbin Du
2020-07-11 12:40 ` [PATCH v5 06/17] perf ftrace: show trace column header Changbin Du
2020-07-11 12:40 ` [PATCH v5 07/17] perf ftrace: add option '--inherit' to trace children processes Changbin Du
2020-07-13 1:59 ` Namhyung Kim
2020-07-17 14:27 ` Changbin Du
2020-07-11 12:40 ` [PATCH v5 08/17] perf: util: add general function to parse sublevel options Changbin Du
2020-07-11 12:40 ` [PATCH v5 09/17] perf ftrace: add support for tracing option 'func_stack_trace' Changbin Du
2020-07-11 12:40 ` [PATCH v5 10/17] perf ftrace: add support for trace option sleep-time Changbin Du
2020-07-11 12:40 ` [PATCH v5 11/17] perf ftrace: add support for trace option funcgraph-irqs Changbin Du
2020-07-11 12:40 ` [PATCH v5 12/17] perf ftrace: add support for tracing option 'irq-info' Changbin Du
2020-07-11 12:40 ` [PATCH v5 13/17] perf ftrace: add option 'verbose' to show more info for graph tracer Changbin Du
2020-07-13 2:07 ` Namhyung Kim
2020-07-17 14:13 ` Changbin Du
2020-07-11 12:40 ` [PATCH v5 14/17] perf ftrace: add support for trace option tracing_thresh Changbin Du
2020-07-11 12:40 ` [PATCH v5 15/17] perf: ftrace: allow set graph depth by '--graph-opts' Changbin Du
2020-07-11 12:40 ` [PATCH v5 16/17] perf ftrace: add option -D/--delay to delay tracing Changbin Du
2020-07-11 12:40 ` [PATCH v5 17/17] perf ftrace: add change log Changbin Du
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200711124035.6513-3-changbin.du@gmail.com \
--to=changbin.du@gmail.com \
--cc=acme@kernel.org \
--cc=jolsa@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=namhyung@kernel.org \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).