[PATCH perf/core 4/8] perf probe: Accept filter argument for --list

Masami Hiramatsu
2015-04-21T11:44:18Z

Currently, perf-probe --list option ignores given event filter.
----
# ./perf probe -l vfs\*
probe:vfs_read (on vfs_read@ksrc/linux-3/fs/read_write.c)
probe_libc:malloc (on __libc_malloc@malloc/malloc.c in /usr/lib64/libc-2.17.so)
----

This changes --list option to accept the event filter argument as below.
----
# ./perf probe -l vfs\*
probe:vfs_read (on vfs_read@ksrc/linux-3/fs/read_write.c)
# ./perf probe -l \*libc:\*
probe_libc:malloc (on __libc_malloc@malloc/malloc.c in /usr/lib64/libc-2.17.so)
----

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
tools/perf/Documentation/perf-probe.txt | 6 +--
tools/perf/builtin-probe.c | 70 ++++++++++++++++++++-----------
tools/perf/util/probe-event.c | 27 ++++++++++--
tools/perf/util/probe-event.h | 2 -
4 files changed, 73 insertions(+), 32 deletions(-)

diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index a4a3cc7..d0feb8e 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -14,7 +14,7 @@ or
or
'perf probe' [options] --del='[GROUP:]EVENT' [...]
or
-'perf probe' --list
+'perf probe' --list[=[GROUP:]EVENT]
or
'perf probe' [options] --line='LINE'
or
@@ -66,8 +66,8 @@ OPTIONS
classes(e.g. [a-z], [!A-Z]).

-l::
---list::
- List up current probe events.
+--list[=[GROUP:]EVENT]::
+ List up current probe events. This can also accept filtering patterns of event names.

-L::
--line=::
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index be17075..feca316 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -44,6 +44,7 @@

#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
#define DEFAULT_FUNC_FILTER "!_*"
+#define DEFAULT_LIST_FILTER "*:*"

/* Session management structure */
static struct {
@@ -93,6 +94,28 @@ static int parse_probe_event(const char *str)
return ret;
}

+static int params_add_filter(const char *str)
+{
+ const char *err = NULL;
+ int ret = 0;
+
+ pr_debug2("Add filter: %s\n", str);
+ if (!params.filter) {
+ params.filter = strfilter__new(str, &err);
+ if (!params.filter)
+ ret = err ? -EINVAL : -ENOMEM;
+ } else
+ ret = strfilter__or(params.filter, str, &err);
+
+ if (ret == -EINVAL) {
+ pr_err("Filter parse error at %td.\n", err - str + 1);
+ pr_err("Source: \"%s\"\n", str);
+ pr_err(" %*c\n", (int)(err - str + 1), '^');
+ }
+
+ return ret;
+}
+
static int set_target(const char *ptr)
{
int found = 0;
@@ -180,6 +203,18 @@ static int opt_del_probe_event(const struct option *opt __maybe_unused,
return 0;
}

+static int opt_list_probe_event(const struct option *opt __maybe_unused,
+ const char *str, int unset)
+{
+ if (!unset)
+ params.list_events = true;
+
+ if (str)
+ return params_add_filter(str);
+
+ return 0;
+}
+
static int opt_set_target(const struct option *opt, const char *str,
int unset __maybe_unused)
{
@@ -261,26 +296,10 @@ static int opt_show_vars(const struct option *opt __maybe_unused,
static int opt_set_filter(const struct option *opt __maybe_unused,
const char *str, int unset __maybe_unused)
{
- const char *err;
- int ret = 0;
+ if (str)
+ return params_add_filter(str);

- if (str) {
- pr_debug2("Set filter: %s\n", str);
- if (!params.filter) {
- params.filter = strfilter__new(str, &err);
- if (!params.filter)
- ret = err ? -EINVAL : -ENOMEM;
- } else
- ret = strfilter__or(params.filter, str, &err);
-
- if (ret == -EINVAL) {
- pr_err("Filter parse error at %td.\n", err - str + 1);
- pr_err("Source: \"%s\"\n", str);
- pr_err(" %*c\n", (int)(err - str + 1), '^');
- }
- }
-
- return ret;
+ return 0;
}

static int init_params(void)
@@ -320,21 +339,22 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
"perf probe [<options>] --del '[GROUP:]EVENT' ...",
- "perf probe --list",
+ "perf probe --list [GROUP:]EVENT ...",
#ifdef HAVE_DWARF_SUPPORT
"perf probe [<options>] --line 'LINEDESC'",
"perf probe [<options>] --vars 'PROBEPOINT'",
#endif
"perf probe [<options>] --funcs",
NULL
-};
+ };
struct option options[] = {
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show parsed arguments, etc)"),
OPT_BOOLEAN('q', "quiet", &params.quiet,
"be quiet (do not show any mesages)"),
- OPT_BOOLEAN('l', "list", &params.list_events,
- "list up current probe events"),
+ OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
+ "list up probe events", opt_list_probe_event,
+ DEFAULT_LIST_FILTER),
OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
opt_del_probe_event),
OPT_CALLBACK('a', "add", NULL,
@@ -448,7 +468,9 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
pr_warning(" Error: Don't use --list with --exec.\n");
usage_with_options(probe_usage, options);
}
- ret = show_perf_probe_events();
+ ret = show_perf_probe_events(params.filter);
+ strfilter__delete(params.filter);
+ params.filter = NULL;
if (ret < 0)
pr_err_with_code(" Error: Failed to show event list.", ret);
return ret;
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index cae1fd7..38bb282 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2129,7 +2129,23 @@ static int show_perf_probe_event(struct perf_probe_event *pev,
return ret;
}

-static int __show_perf_probe_events(int fd, bool is_kprobe)
+static bool filter_probe_trace_event(struct probe_trace_event *tev,
+ struct strfilter *filter)
+{
+ char tmp[128];
+
+ /* At first, check the event name itself */
+ if (strfilter__compare(filter, tev->event))
+ return true;
+
+ /* Next, check the combination of name and group */
+ if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
+ return false;
+ return strfilter__compare(filter, tmp);
+}
+
+static int __show_perf_probe_events(int fd, bool is_kprobe,
+ struct strfilter *filter)
{
int ret = 0;
struct probe_trace_event tev;
@@ -2147,12 +2163,15 @@ static int __show_perf_probe_events(int fd, bool is_kprobe)
strlist__for_each(ent, rawlist) {
ret = parse_probe_trace_command(ent->s, &tev);
if (ret >= 0) {
+ if (!filter_probe_trace_event(&tev, filter))
+ goto next;
ret = convert_to_perf_probe_event(&tev, &pev,
is_kprobe);
if (ret >= 0)
ret = show_perf_probe_event(&pev,
tev.point.module);
}
+next:
clear_perf_probe_event(&pev);
clear_probe_trace_event(&tev);
if (ret < 0)
@@ -2164,7 +2183,7 @@ static int __show_perf_probe_events(int fd, bool is_kprobe)
}

/* List up current perf-probe events */
-int show_perf_probe_events(void)
+int show_perf_probe_events(struct strfilter *filter)
{
int kp_fd, up_fd, ret;

@@ -2176,7 +2195,7 @@ int show_perf_probe_events(void)

kp_fd = open_kprobe_events(false);
if (kp_fd >= 0) {
- ret = __show_perf_probe_events(kp_fd, true);
+ ret = __show_perf_probe_events(kp_fd, true, filter);
close(kp_fd);
if (ret < 0)
goto out;
@@ -2190,7 +2209,7 @@ int show_perf_probe_events(void)
}

if (up_fd >= 0) {
- ret = __show_perf_probe_events(up_fd, false);
+ ret = __show_perf_probe_events(up_fd, false, filter);
close(up_fd);
}
out:
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index d6b7834..819e825 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -127,7 +127,7 @@ extern const char *kernel_get_module_path(const char *module);
extern int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
int max_probe_points, bool force_add);
extern int del_perf_probe_events(struct strlist *dellist);
-extern int show_perf_probe_events(void);
+extern int show_perf_probe_events(struct strfilter *filter);
extern int show_line_range(struct line_range *lr, const char *module,
bool user);
extern int show_available_vars(struct perf_probe_event *pevs, int npevs,