perf probe: Add --funcs to show available functions in symtab

Add --funcs to show available functions in symtab.

Originally this feature came from Srikar's uprobes patches
( http://lkml.org/lkml/2010/8/27/244 )

e.g.
...
__ablkcipher_walk_complete
__absent_pages_in_range
__account_scheduler_latency
__add_pages
__alloc_pages_nodemask
__alloc_percpu
__alloc_reserved_percpu
__alloc_skb
__alloc_workqueue_key
__any_online_cpu
__ata_ehi_push_desc
...

This also supports symbols in module, e.g.

...
cleanup_module
cpuid_maxphyaddr
emulate_clts
emulate_instruction
emulate_int_real
emulate_invlpg
emulator_get_dr
emulator_set_dr
emulator_task_switch
emulator_write_emulated
emulator_write_phys
fx_init
...

Original-patch-from: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: 2nddept-manager@sdl.hitachi.co.jp
Cc: Franck Bui-Huu <fbuihuu@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20110113124611.22426.10835.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
[ committer note: Add missing elf.h for STB_GLOBAL that broke a RHEL4 build ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 28 insertions, 1 deletions

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index add163c9f0e7..6cf708aba7c9 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -52,6 +52,7 @@ static struct {
         bool show_lines;
         bool show_vars;
         bool show_ext_vars;
+        bool show_funcs;
         bool mod_events;
         int nevents;
         struct perf_probe_event events[MAX_PROBES];
@@ -221,6 +222,8 @@ static const struct option options[] = {
         OPT__DRY_RUN(&probe_event_dry_run),
         OPT_INTEGER('\0', "max-probes", &params.max_probe_points,
                  "Set how many probe points can be found for a probe."),
+        OPT_BOOLEAN('F', "funcs", &params.show_funcs,
+                    "Show potential probe-able functions."),
         OPT_END()
 };
 
@@ -246,7 +249,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
                 params.max_probe_points = MAX_PROBES;
 
         if ((!params.nevents && !params.dellist && !params.list_events &&
-             !params.show_lines))
+             !params.show_lines && !params.show_funcs))
                 usage_with_options(probe_usage, options);
 
         /*
@@ -267,12 +270,36 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
                         pr_err(" Error: Don't use --list with --vars.\n");
                         usage_with_options(probe_usage, options);
                 }
+                if (params.show_funcs) {
+                        pr_err("  Error: Don't use --list with --funcs.\n");
+                        usage_with_options(probe_usage, options);
+                }
                 ret = show_perf_probe_events();
                 if (ret < 0)
                         pr_err("  Error: Failed to show event list. (%d)\n",
                                ret);
                 return ret;
         }
+        if (params.show_funcs) {
+                if (params.nevents != 0 || params.dellist) {
+                        pr_err("  Error: Don't use --funcs with"
+                               " --add/--del.\n");
+                        usage_with_options(probe_usage, options);
+                }
+                if (params.show_lines) {
+                        pr_err("  Error: Don't use --funcs with --line.\n");
+                        usage_with_options(probe_usage, options);
+                }
+                if (params.show_vars) {
+                        pr_err("  Error: Don't use --funcs with --vars.\n");
+                        usage_with_options(probe_usage, options);
+                }
+                ret = show_available_funcs(params.target_module);
+                if (ret < 0)
+                        pr_err("  Error: Failed to show functions."
+                               " (%d)\n", ret);
+                return ret;
+        }
 
 #ifdef DWARF_SUPPORT
         if (params.show_lines) {