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Subject[PATCH 26/30] perf probe: Use perf_probe_event.target instead of passing as an argument
Date
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>

Use perf_probe_event.target field for the target binary instead of
passing it as an argument.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150508010328.24812.67887.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-probe.c | 1 -
tools/perf/util/probe-event.c | 55 ++++++++++++++++++++-----------------------
tools/perf/util/probe-event.h | 4 ++--
3 files changed, 27 insertions(+), 33 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 9c4cf5e..233f941 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -478,7 +478,6 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)

ret = show_available_vars(params.events, params.nevents,
params.max_probe_points,
- params.target,
params.filter,
params.show_ext_vars);
if (ret < 0)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 37a3a8b..b8fd48d 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -344,15 +344,14 @@ out:

static int get_alternative_probe_event(struct debuginfo *dinfo,
struct perf_probe_event *pev,
- struct perf_probe_point *tmp,
- const char *target)
+ struct perf_probe_point *tmp)
{
int ret;

memcpy(tmp, &pev->point, sizeof(*tmp));
memset(&pev->point, 0, sizeof(pev->point));
ret = find_alternative_probe_point(dinfo, tmp, &pev->point,
- target, pev->uprobes);
+ pev->target, pev->uprobes);
if (ret < 0)
memcpy(&pev->point, tmp, sizeof(*tmp));

@@ -601,15 +600,14 @@ static int post_process_probe_trace_events(struct probe_trace_event *tevs,
/* Try to find perf_probe_event with debuginfo */
static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
struct probe_trace_event **tevs,
- int max_tevs, const char *target)
+ int max_tevs)
{
bool need_dwarf = perf_probe_event_need_dwarf(pev);
struct perf_probe_point tmp;
struct debuginfo *dinfo;
int ntevs, ret = 0;

- dinfo = open_debuginfo(target, !need_dwarf);
-
+ dinfo = open_debuginfo(pev->target, !need_dwarf);
if (!dinfo) {
if (need_dwarf)
return -ENOENT;
@@ -622,7 +620,7 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
ntevs = debuginfo__find_trace_events(dinfo, pev, tevs, max_tevs);

if (ntevs == 0) { /* Not found, retry with an alternative */
- ret = get_alternative_probe_event(dinfo, pev, &tmp, target);
+ ret = get_alternative_probe_event(dinfo, pev, &tmp);
if (!ret) {
ntevs = debuginfo__find_trace_events(dinfo, pev,
tevs, max_tevs);
@@ -640,7 +638,7 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
if (ntevs > 0) { /* Succeeded to find trace events */
pr_debug("Found %d probe_trace_events.\n", ntevs);
ret = post_process_probe_trace_events(*tevs, ntevs,
- target, pev->uprobes);
+ pev->target, pev->uprobes);
if (ret < 0 || ret == ntevs) {
clear_probe_trace_events(*tevs, ntevs);
zfree(tevs);
@@ -824,7 +822,7 @@ int show_line_range(struct line_range *lr, const char *module, bool user)
static int show_available_vars_at(struct debuginfo *dinfo,
struct perf_probe_event *pev,
int max_vls, struct strfilter *_filter,
- bool externs, const char *target)
+ bool externs)
{
char *buf;
int ret, i, nvars;
@@ -841,7 +839,7 @@ static int show_available_vars_at(struct debuginfo *dinfo,
ret = debuginfo__find_available_vars_at(dinfo, pev, &vls,
max_vls, externs);
if (!ret) { /* Not found, retry with an alternative */
- ret = get_alternative_probe_event(dinfo, pev, &tmp, target);
+ ret = get_alternative_probe_event(dinfo, pev, &tmp);
if (!ret) {
ret = debuginfo__find_available_vars_at(dinfo, pev,
&vls, max_vls, externs);
@@ -891,8 +889,7 @@ end:

/* Show available variables on given probe point */
int show_available_vars(struct perf_probe_event *pevs, int npevs,
- int max_vls, const char *module,
- struct strfilter *_filter, bool externs)
+ int max_vls, struct strfilter *_filter, bool externs)
{
int i, ret = 0;
struct debuginfo *dinfo;
@@ -901,7 +898,7 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
if (ret < 0)
return ret;

- dinfo = open_debuginfo(module, false);
+ dinfo = open_debuginfo(pevs->target, false);
if (!dinfo) {
ret = -ENOENT;
goto out;
@@ -911,7 +908,7 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,

for (i = 0; i < npevs && ret >= 0; i++)
ret = show_available_vars_at(dinfo, &pevs[i], max_vls, _filter,
- externs, module);
+ externs);

debuginfo__delete(dinfo);
out:
@@ -931,8 +928,7 @@ find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,

static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
struct probe_trace_event **tevs __maybe_unused,
- int max_tevs __maybe_unused,
- const char *target __maybe_unused)
+ int max_tevs __maybe_unused)
{
if (perf_probe_event_need_dwarf(pev)) {
pr_warning("Debuginfo-analysis is not supported.\n");
@@ -952,7 +948,6 @@ int show_line_range(struct line_range *lr __maybe_unused,

int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
int npevs __maybe_unused, int max_vls __maybe_unused,
- const char *module __maybe_unused,
struct strfilter *filter __maybe_unused,
bool externs __maybe_unused)
{
@@ -2520,7 +2515,7 @@ void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
*/
static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
struct probe_trace_event **tevs,
- int max_tevs, const char *target)
+ int max_tevs)
{
struct map *map = NULL;
struct ref_reloc_sym *reloc_sym = NULL;
@@ -2531,7 +2526,7 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
int num_matched_functions;
int ret, i;

- map = get_target_map(target, pev->uprobes);
+ map = get_target_map(pev->target, pev->uprobes);
if (!map) {
ret = -EINVAL;
goto out;
@@ -2544,12 +2539,12 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
num_matched_functions = find_probe_functions(map, pp->function);
if (num_matched_functions == 0) {
pr_err("Failed to find symbol %s in %s\n", pp->function,
- target ? : "kernel");
+ pev->target ? : "kernel");
ret = -ENOENT;
goto out;
} else if (num_matched_functions > max_tevs) {
pr_err("Too many functions matched in %s\n",
- target ? : "kernel");
+ pev->target ? : "kernel");
ret = -E2BIG;
goto out;
}
@@ -2597,8 +2592,9 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
tp->offset = pp->offset;
}
tp->retprobe = pp->retprobe;
- if (target)
- tev->point.module = strdup_or_goto(target, nomem_out);
+ if (pev->target)
+ tev->point.module = strdup_or_goto(pev->target,
+ nomem_out);
tev->uprobes = pev->uprobes;
tev->nargs = pev->nargs;
if (tev->nargs) {
@@ -2639,13 +2635,13 @@ bool __weak arch__prefers_symtab(void) { return false; }

static int convert_to_probe_trace_events(struct perf_probe_event *pev,
struct probe_trace_event **tevs,
- int max_tevs, const char *target)
+ int max_tevs)
{
int ret;

if (pev->uprobes && !pev->group) {
/* Replace group name if not given */
- ret = convert_exec_to_group(target, &pev->group);
+ ret = convert_exec_to_group(pev->target, &pev->group);
if (ret != 0) {
pr_warning("Failed to make a group name.\n");
return ret;
@@ -2653,17 +2649,17 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
}

if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
- ret = find_probe_trace_events_from_map(pev, tevs, max_tevs, target);
+ ret = find_probe_trace_events_from_map(pev, tevs, max_tevs);
if (ret > 0)
return ret; /* Found in symbol table */
}

/* Convert perf_probe_event with debuginfo */
- ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, target);
+ ret = try_to_find_probe_trace_events(pev, tevs, max_tevs);
if (ret != 0)
return ret; /* Found in debuginfo or got an error */

- return find_probe_trace_events_from_map(pev, tevs, max_tevs, target);
+ return find_probe_trace_events_from_map(pev, tevs, max_tevs);
}

struct __event_package {
@@ -2696,8 +2692,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
/* Convert with or without debuginfo */
ret = convert_to_probe_trace_events(pkgs[i].pev,
&pkgs[i].tevs,
- max_tevs,
- pkgs[i].pev->target);
+ max_tevs);
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 e10aedc..e3d9bb1 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -131,8 +131,8 @@ 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,
- int max_probe_points, const char *module,
- struct strfilter *filter, bool externs);
+ int max_probe_points, struct strfilter *filter,
+ bool externs);
extern int show_available_funcs(const char *module, struct strfilter *filter,
bool user);
bool arch__prefers_symtab(void);
--
2.1.0


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