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>
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@ -73,6 +73,10 @@ OPTIONS
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(Only for --vars) Show external defined variables in addition to local
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(Only for --vars) Show external defined variables in addition to local
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variables.
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variables.
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-F::
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--funcs::
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Show available functions in given module or kernel.
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-f::
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-f::
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--force::
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--force::
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Forcibly add events with existing name.
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Forcibly add events with existing name.
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@ -52,6 +52,7 @@ static struct {
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bool show_lines;
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bool show_lines;
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bool show_vars;
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bool show_vars;
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bool show_ext_vars;
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bool show_ext_vars;
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bool show_funcs;
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bool mod_events;
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bool mod_events;
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int nevents;
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int nevents;
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struct perf_probe_event events[MAX_PROBES];
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struct perf_probe_event events[MAX_PROBES];
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@ -221,6 +222,8 @@ static const struct option options[] = {
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OPT__DRY_RUN(&probe_event_dry_run),
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OPT__DRY_RUN(&probe_event_dry_run),
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OPT_INTEGER('\0', "max-probes", ¶ms.max_probe_points,
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OPT_INTEGER('\0', "max-probes", ¶ms.max_probe_points,
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"Set how many probe points can be found for a probe."),
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"Set how many probe points can be found for a probe."),
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OPT_BOOLEAN('F', "funcs", ¶ms.show_funcs,
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"Show potential probe-able functions."),
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OPT_END()
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OPT_END()
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};
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};
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@ -246,7 +249,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
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params.max_probe_points = MAX_PROBES;
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params.max_probe_points = MAX_PROBES;
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if ((!params.nevents && !params.dellist && !params.list_events &&
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if ((!params.nevents && !params.dellist && !params.list_events &&
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!params.show_lines))
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!params.show_lines && !params.show_funcs))
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usage_with_options(probe_usage, options);
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usage_with_options(probe_usage, options);
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/*
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/*
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@ -267,12 +270,36 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
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pr_err(" Error: Don't use --list with --vars.\n");
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pr_err(" Error: Don't use --list with --vars.\n");
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usage_with_options(probe_usage, options);
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usage_with_options(probe_usage, options);
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}
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}
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if (params.show_funcs) {
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pr_err(" Error: Don't use --list with --funcs.\n");
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usage_with_options(probe_usage, options);
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}
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ret = show_perf_probe_events();
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ret = show_perf_probe_events();
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if (ret < 0)
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if (ret < 0)
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pr_err(" Error: Failed to show event list. (%d)\n",
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pr_err(" Error: Failed to show event list. (%d)\n",
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ret);
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ret);
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return ret;
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return ret;
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}
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}
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if (params.show_funcs) {
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if (params.nevents != 0 || params.dellist) {
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pr_err(" Error: Don't use --funcs with"
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" --add/--del.\n");
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usage_with_options(probe_usage, options);
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}
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if (params.show_lines) {
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pr_err(" Error: Don't use --funcs with --line.\n");
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usage_with_options(probe_usage, options);
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}
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if (params.show_vars) {
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pr_err(" Error: Don't use --funcs with --vars.\n");
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usage_with_options(probe_usage, options);
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}
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ret = show_available_funcs(params.target_module);
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if (ret < 0)
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pr_err(" Error: Failed to show functions."
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" (%d)\n", ret);
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return ret;
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}
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#ifdef DWARF_SUPPORT
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#ifdef DWARF_SUPPORT
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if (params.show_lines) {
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if (params.show_lines) {
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@ -31,6 +31,7 @@
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#include <string.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <limits.h>
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#include <elf.h>
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#undef _GNU_SOURCE
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#undef _GNU_SOURCE
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#include "util.h"
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#include "util.h"
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@ -111,7 +112,25 @@ static struct symbol *__find_kernel_function_by_name(const char *name,
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NULL);
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NULL);
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}
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}
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const char *kernel_get_module_path(const char *module)
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static struct map *kernel_get_module_map(const char *module)
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{
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struct rb_node *nd;
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struct map_groups *grp = &machine.kmaps;
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if (!module)
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module = "kernel";
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for (nd = rb_first(&grp->maps[MAP__FUNCTION]); nd; nd = rb_next(nd)) {
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struct map *pos = rb_entry(nd, struct map, rb_node);
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if (strncmp(pos->dso->short_name + 1, module,
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pos->dso->short_name_len - 2) == 0) {
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return pos;
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}
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}
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return NULL;
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}
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static struct dso *kernel_get_module_dso(const char *module)
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{
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{
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struct dso *dso;
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struct dso *dso;
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struct map *map;
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struct map *map;
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@ -141,7 +160,13 @@ const char *kernel_get_module_path(const char *module)
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}
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}
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}
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}
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found:
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found:
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return dso->long_name;
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return dso;
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}
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const char *kernel_get_module_path(const char *module)
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{
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struct dso *dso = kernel_get_module_dso(module);
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return (dso) ? dso->long_name : NULL;
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}
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}
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#ifdef DWARF_SUPPORT
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#ifdef DWARF_SUPPORT
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@ -1913,3 +1938,42 @@ int del_perf_probe_events(struct strlist *dellist)
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return ret;
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return ret;
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}
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}
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/*
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* If a symbol corresponds to a function with global binding return 0.
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* For all others return 1.
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*/
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static int filter_non_global_functions(struct map *map __unused,
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struct symbol *sym)
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{
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if (sym->binding != STB_GLOBAL)
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return 1;
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return 0;
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}
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int show_available_funcs(const char *module)
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{
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struct map *map;
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int ret;
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setup_pager();
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ret = init_vmlinux();
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if (ret < 0)
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return ret;
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map = kernel_get_module_map(module);
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if (!map) {
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pr_err("Failed to find %s map.\n", (module) ? : "kernel");
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return -EINVAL;
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}
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if (map__load(map, filter_non_global_functions)) {
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pr_err("Failed to load map.\n");
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return -EINVAL;
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}
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if (!dso__sorted_by_name(map->dso, map->type))
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dso__sort_by_name(map->dso, map->type);
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dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
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return 0;
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}
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@ -127,6 +127,7 @@ extern int show_line_range(struct line_range *lr, const char *module);
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extern int show_available_vars(struct perf_probe_event *pevs, int npevs,
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extern int show_available_vars(struct perf_probe_event *pevs, int npevs,
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int max_probe_points, const char *module,
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int max_probe_points, const char *module,
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bool externs);
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bool externs);
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extern int show_available_funcs(const char *module);
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/* Maximum index number of event-name postfix */
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/* Maximum index number of event-name postfix */
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