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Subject[PATCH v5 3.1.0-rc4-tip 24/26] perf: show possible probes in a given executable file or library.

Enhances -F/--funcs option of "perf probe" to list possible probe points in
an executable file or library.

Show last 10 functions in /bin/zsh.

# perf probe -F -x /bin/zsh | tail
zstrtol
ztrcmp
ztrdup
ztrduppfx
ztrftime
ztrlen
ztrncpy
ztrsub
zwarn
zwarnnam

Show first 10 functions in /lib/libc.so.6

# perf probe -F -x /lib/libc.so.6 | head
_IO_adjust_column
_IO_adjust_wcolumn
_IO_default_doallocate
_IO_default_finish
_IO_default_pbackfail
_IO_default_uflow
_IO_default_xsgetn
_IO_default_xsputn
_IO_do_write@@GLIBC_2.2.5
_IO_doallocbuf

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---
tools/perf/builtin-probe.c | 4 +--
tools/perf/util/probe-event.c | 56 +++++++++++++++++++++++++++++++----------
tools/perf/util/probe-event.h | 4 +--
3 files changed, 47 insertions(+), 17 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 43e6321..5e7622c 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -365,8 +365,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
if (!params.filter)
params.filter = strfilter__new(DEFAULT_FUNC_FILTER,
NULL);
- ret = show_available_funcs(params.target,
- params.filter);
+ ret = show_available_funcs(params.target, params.filter,
+ params.uprobes);
strfilter__delete(params.filter);
if (ret < 0)
pr_err(" Error: Failed to show functions."
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index a501486..659fecb 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -47,6 +47,7 @@
#include "trace-event.h" /* For __unused */
#include "probe-event.h"
#include "probe-finder.h"
+#include "session.h"

#define MAX_CMDLEN 256
#define MAX_PROBE_ARGS 128
@@ -2161,6 +2162,7 @@ int del_perf_probe_events(struct strlist *dellist)
}
return ret;
}
+
/* TODO: don't use a global variable for filter ... */
static struct strfilter *available_func_filter;

@@ -2177,32 +2179,60 @@ static int filter_available_functions(struct map *map __unused,
return 1;
}

-int show_available_funcs(const char *target, struct strfilter *_filter)
+static int __show_available_funcs(struct map *map)
+{
+ if (map__load(map, filter_available_functions)) {
+ pr_err("Failed to load map.\n");
+ return -EINVAL;
+ }
+ if (!dso__sorted_by_name(map->dso, map->type))
+ dso__sort_by_name(map->dso, map->type);
+
+ dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
+ return 0;
+}
+
+static int available_kernel_funcs(const char *module)
{
struct map *map;
int ret;

- setup_pager();
-
ret = init_vmlinux();
if (ret < 0)
return ret;

- map = kernel_get_module_map(target);
+ map = kernel_get_module_map(module);
if (!map) {
- pr_err("Failed to find %s map.\n", (target) ? : "kernel");
+ pr_err("Failed to find %s map.\n", (module) ? : "kernel");
return -EINVAL;
}
+ return __show_available_funcs(map);
+}
+
+int show_available_funcs(const char *target, struct strfilter *_filter,
+ bool user)
+{
+ struct map *map;
+ int ret;
+
+ setup_pager();
available_func_filter = _filter;
- if (map__load(map, filter_available_functions)) {
- pr_err("Failed to load map.\n");
- return -EINVAL;
- }
- if (!dso__sorted_by_name(map->dso, map->type))
- dso__sort_by_name(map->dso, map->type);

- dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
- return 0;
+ if (!user)
+ return available_kernel_funcs(target);
+
+ symbol_conf.try_vmlinux_path = false;
+ symbol_conf.sort_by_name = true;
+ ret = symbol__init();
+ if (ret < 0) {
+ pr_err("Failed to init symbol map.\n");
+ return ret;
+ }
+ map = dso__new_map(target);
+ ret = __show_available_funcs(map);
+ dso__delete(map->dso);
+ map__delete(map);
+ return ret;
}

#define DEFAULT_FUNC_FILTER "!_*"
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 9e8c846..f9f3de8 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -131,8 +131,8 @@ extern int show_line_range(struct line_range *lr, const char *module);
extern int show_available_vars(struct perf_probe_event *pevs, int npevs,
int max_probe_points, const char *module,
struct strfilter *filter, bool externs);
-extern int show_available_funcs(const char *module, struct strfilter *filter);
-
+extern int show_available_funcs(const char *module, struct strfilter *filter,
+ bool user);

/* Maximum index number of event-name postfix */
#define MAX_EVENT_INDEX 1024

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