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Subject[PATCH perf/core 1/2] perf-probe: Support multiple probes on different binaries
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Support multiple probes on different binaries with just
one command.

In the result, this example sets up the probes on icmp_rcv in
kernel, on main and set_target in perf, and on pcspkr_event
in pcspker.ko driver.
-----
# perf probe -a icmp_rcv -x ./perf -a main -a set_target \
-m /lib/modules/4.0.0-rc5+/kernel/drivers/input/misc/pcspkr.ko \
-a pcspkr_event
Added new event:
probe:icmp_rcv (on icmp_rcv)

You can now use it in all perf tools, such as:

perf record -e probe:icmp_rcv -aR sleep 1

Added new event:
probe_perf:main (on main in /home/mhiramat/ksrc/linux-3/tools/perf/perf)

You can now use it in all perf tools, such as:

perf record -e probe_perf:main -aR sleep 1

Added new event:
probe_perf:set_target (on set_target in /home/mhiramat/ksrc/linux-3/tools/perf/perf)

You can now use it in all perf tools, such as:

perf record -e probe_perf:set_target -aR sleep 1

Added new event:
probe:pcspkr_event (on pcspkr_event in pcspkr)

You can now use it in all perf tools, such as:

perf record -e probe:pcspkr_event -aR sleep 1
-----

Reported-by: Arnaldo Carvalho de Melo <acme@infradead.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
tools/perf/builtin-probe.c | 9 +++++++--
tools/perf/util/probe-event.c | 5 +++--
tools/perf/util/probe-event.h | 6 +++---
3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 921bb69..2df23e1 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -78,6 +78,11 @@ static int parse_probe_event(const char *str)
}

pev->uprobes = params.uprobes;
+ if (params.target) {
+ pev->target = strdup(params.target);
+ if (!pev->target)
+ return -ENOMEM;
+ }

/* Parse a perf-probe command into event */
ret = parse_perf_probe_command(str, pev);
@@ -178,7 +183,7 @@ static int opt_set_target(const struct option *opt, const char *str,
int ret = -ENOENT;
char *tmp;

- if (str && !params.target) {
+ if (str) {
if (!strcmp(opt->long_name, "exec"))
params.uprobes = true;
#ifdef HAVE_DWARF_SUPPORT
@@ -200,6 +205,7 @@ static int opt_set_target(const struct option *opt, const char *str,
if (!tmp)
return -ENOMEM;
}
+ free(params.target);
params.target = tmp;
ret = 0;
}
@@ -487,7 +493,6 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
if (params.nevents) {
ret = add_perf_probe_events(params.events, params.nevents,
params.max_probe_points,
- params.target,
params.force_add);
if (ret < 0) {
pr_err_with_code(" Error: Failed to add events.", ret);
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 8feac07..9b02db8 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1903,6 +1903,7 @@ void clear_perf_probe_event(struct perf_probe_event *pev)

free(pev->event);
free(pev->group);
+ free(pev->target);
clear_perf_probe_point(&pev->point);

for (i = 0; i < pev->nargs; i++) {
@@ -2651,7 +2652,7 @@ struct __event_package {
};

int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
- int max_tevs, const char *target, bool force_add)
+ int max_tevs, bool force_add)
{
int i, j, ret;
struct __event_package *pkgs;
@@ -2675,7 +2676,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
ret = convert_to_probe_trace_events(pkgs[i].pev,
&pkgs[i].tevs,
max_tevs,
- target);
+ pkgs[i].pev->target);
if (ret < 0)
goto end;
pkgs[i].ntevs = ret;
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index e01e994..d6b7834 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -73,7 +73,8 @@ struct perf_probe_event {
char *group; /* Group name */
struct perf_probe_point point; /* Probe point */
int nargs; /* Number of arguments */
- bool uprobes;
+ bool uprobes; /* Uprobe event flag */
+ char *target; /* Target binary */
struct perf_probe_arg *args; /* Arguments */
};

@@ -124,8 +125,7 @@ extern int line_range__init(struct line_range *lr);
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, const char *module,
- bool force_add);
+ 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_line_range(struct line_range *lr, const char *module,


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