Messages in this thread Patch in this message | | | From | Srikar Dronamraju <> | Date | Wed, 25 Aug 2010 19:13:43 +0530 | Subject | [PATCHv11 2.6.36-rc2-tip 12/15] 12: perf: show possible probes in a given file. |
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Introduces -S/--show_functions option for perf-probe. This lists function names in a File. If no file is specified, then lists functions in the current running kernel.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> ---
Changelog from V10: As suggested by Arnaldo, filtering is now based on sym.binding.
Changelog from V9: Filter labels, weak, and local binding functions from listing as suggested by Christoph Hellwig.
Show last 10 functions in /bin/zsh.
# perf probe -S -D /bin/zsh | tail zstrtol ztrcmp ztrdup ztrduppfx ztrftime ztrlen ztrncpy ztrsub zwarn zwarnnam
Show first 10 functions in /lib/libc.so.6
# perf probe -S -D /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
Show last 10 functions in kernel.
# perf probe -S | tail zlib_inflateInit2 zlib_inflateReset zlib_inflate_blob zlib_inflate_table zlib_inflate_workspacesize zone_pcp_update zone_reclaim zone_reclaimable_pages zone_statistics zone_watermark_ok
tools/perf/builtin-probe.c | 43 ++++++++++++++++++++++++ tools/perf/util/probe-event.c | 72 +++++++++++++++++++++++++++++++++++++++++ tools/perf/util/probe-event.h | 1 + tools/perf/util/symbol.c | 8 +++++ tools/perf/util/symbol.h | 1 + 5 files changed, 124 insertions(+), 1 deletions(-)
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c index 199d5e1..fa63245 100644 --- a/tools/perf/builtin-probe.c +++ b/tools/perf/builtin-probe.c @@ -50,9 +50,11 @@ static struct { bool list_events; bool force_add; bool show_lines; + bool list_functions; int nevents; struct perf_probe_event events[MAX_PROBES]; struct strlist *dellist; + struct strlist *limitlist; struct line_range line_range; int max_probe_points; } params; @@ -132,6 +134,19 @@ static int opt_show_lines(const struct option *opt __used, } #endif +static int opt_limit_dsos(const struct option *opt __used, + const char *str, int unset __used) +{ + if (str) { + if (!params.limitlist) + params.limitlist = strlist__new(true, NULL); + if (!params.limitlist) + return -1; + strlist__add(params.limitlist, str); + } + return 0; +} + static const char * const probe_usage[] = { "perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]", "perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]", @@ -188,6 +203,10 @@ static const struct option options[] = { OPT__DRY_RUN(&probe_event_dry_run), OPT_INTEGER('\0', "max-probes", ¶ms.max_probe_points, "Set how many probe points can be found for a probe."), + OPT_BOOLEAN('S', "show_functions", ¶ms.list_functions, + "Show potential probes."), + OPT_CALLBACK('D', "limit_dsos", NULL, "DSO", + "Limit Dsos.", opt_limit_dsos), OPT_END() }; @@ -213,7 +232,7 @@ 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.list_functions)) usage_with_options(probe_usage, options); if (params.list_events) { @@ -225,12 +244,34 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used) pr_err(" Error: Don't use --list with --line.\n"); usage_with_options(probe_usage, options); } + if (params.list_functions) { + pr_warning(" Error: Don't use --list with" + " --show_functions.\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.list_functions) { + if (params.nevents != 0 || params.dellist) { + pr_err(" Error: Don't use --show_functions with" + " --add/--del.\n"); + usage_with_options(probe_usage, options); + } + if (params.show_lines) { + pr_err(" Error: Don't use --show_functions with" + " --line.\n"); + usage_with_options(probe_usage, options); + } + ret = show_possible_probes(params.limitlist); + if (ret < 0) + pr_err(" Error: Failed to show possible" + " probes (%d).\n", ret); + return ret; + } #ifdef DWARF_SUPPORT if (params.show_lines) { diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index e72f05c..2efbe4b 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -31,6 +31,7 @@ #include <string.h> #include <stdarg.h> #include <limits.h> +#include <gelf.h> #undef _GNU_SOURCE #include "util.h" @@ -46,6 +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 @@ -1752,3 +1754,73 @@ int del_perf_probe_events(struct strlist *dellist) return ret; } +/* + * If a symbol corresponds to a function with global binding return 0. + * For all others return 1. + */ +static int filter_non_global_functions(struct map *map __unused, + struct symbol *sym) +{ + if (sym->binding != STB_GLOBAL) + return 1; + + return 0; +} + +static int print_list_available_symbols(struct map *map, + const char *name __unused) +{ + if (map__load(map, filter_non_global_functions) < 0) + return -EINVAL; + if (!dso__sorted_by_name(map->dso, map->type)) + dso__sort_by_name(map->dso, map->type); + + dso__fprintf_symbols(map->dso, map->type, stdout); + return 0; +} + +int show_possible_probes(struct strlist *limitlist) +{ + struct str_node *ent; + struct map *map = NULL; + char *str; + int ret = -EINVAL; + + if (!limitlist) { /* Show functions in kernel */ + ret = init_vmlinux(); + if (ret < 0) + return ret; + return print_list_available_symbols( + machine.vmlinux_maps[MAP__FUNCTION], NULL); + } + + symbol_conf.try_vmlinux_path = false; + symbol_conf.sort_by_name = true; + ret = symbol__init(); + if (ret < 0) { + pr_debug("Failed to init symbol map.\n"); + return ret; + } + + strlist__for_each(ent, limitlist) { + str = strdup(ent->s); + if (!str) { + ret = -ENOMEM; + goto out_delete; + } + + map = dso__new_map(str); + ret = print_list_available_symbols(map, NULL); + if (ret) + pr_warning("No Symbols in dso %s.\n", str); + + dso__delete(map->dso); + map__delete(map); + free(str); + } + +out_delete: + if (ret) + pr_warning("Failed to list available probes.\n"); + return ret; +} diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h index 5af3924..fcd0f08 100644 --- a/tools/perf/util/probe-event.h +++ b/tools/perf/util/probe-event.h @@ -115,6 +115,7 @@ extern int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, 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); +extern int show_possible_probes(struct strlist *availlist); /* Maximum index number of event-name postfix */ diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index ca22032..385f0a4 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -2464,3 +2464,11 @@ int machine__load_vmlinux_path(struct machine *self, enum map_type type, return ret; } + +struct map *dso__new_map(char *name) +{ + struct dso *dso = dso__new(name); + struct map *map = map__new2(0, dso, MAP__FUNCTION); + + return map; +} diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h index 72ef973..52a8126 100644 --- a/tools/perf/util/symbol.h +++ b/tools/perf/util/symbol.h @@ -202,6 +202,7 @@ char dso__symtab_origin(const struct dso *self); void dso__set_long_name(struct dso *self, char *name); void dso__set_build_id(struct dso *self, void *build_id); void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine); +struct map *dso__new_map(char *name); struct symbol *dso__find_symbol(struct dso *self, enum map_type type, u64 addr); struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type, const char *name);
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