perf top: Teach it to autolocate vmlinux
By relying on logic in dso__load_kernel_sym(), we can automatically load vmlinux. The only thing which needs to be adjusted, is how --sym-annotate option is handled - now we can't rely on vmlinux been loaded until full successful pass of dso__load_vmlinux(), but that's not the case if we'll do sym_filter_entry setup in symbol_filter(). So move this step right after event__process_sample() where we know the whole dso__load_kernel_sym() pass is done. By the way, though conceptually similar `perf top` still can't annotate userspace - see next patches with fixes. Signed-off-by: Kirill Smelkov <kirr@landau.phys.spbu.ru> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> LKML-Reference: <1265223128-11786-9-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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2 changed files with 24 additions and 17 deletions
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@ -74,7 +74,7 @@ OPTIONS
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-s <symbol>::
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--sym-annotate=<symbol>::
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Annotate this symbol. Requires -k option.
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Annotate this symbol.
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-v::
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--verbose::
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@ -94,6 +94,7 @@ struct source_line {
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static char *sym_filter = NULL;
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struct sym_entry *sym_filter_entry = NULL;
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struct sym_entry *sym_filter_entry_sched = NULL;
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static int sym_pcnt_filter = 5;
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static int sym_counter = 0;
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static int display_weighted = -1;
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@ -695,11 +696,9 @@ static void print_mapped_keys(void)
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fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter);
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if (symbol_conf.vmlinux_name) {
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fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
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fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
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fprintf(stdout, "\t[S] stop annotation.\n");
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}
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fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
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fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
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fprintf(stdout, "\t[S] stop annotation.\n");
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if (nr_counters > 1)
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fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
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@ -725,14 +724,13 @@ static int key_mapped(int c)
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case 'Q':
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case 'K':
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case 'U':
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case 'F':
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case 's':
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case 'S':
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return 1;
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case 'E':
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case 'w':
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return nr_counters > 1 ? 1 : 0;
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case 'F':
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case 's':
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case 'S':
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return symbol_conf.vmlinux_name ? 1 : 0;
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default:
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break;
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}
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@ -910,8 +908,12 @@ static int symbol_filter(struct map *map, struct symbol *sym)
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syme = symbol__priv(sym);
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syme->map = map;
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syme->src = NULL;
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if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
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sym_filter_entry = syme;
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if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter)) {
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/* schedule initial sym_filter_entry setup */
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sym_filter_entry_sched = syme;
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sym_filter = NULL;
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}
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for (i = 0; skip_symbols[i]; i++) {
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if (!strcmp(skip_symbols[i], name)) {
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@ -976,6 +978,13 @@ static void event__process_sample(const event_t *self,
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return;
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}
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/* let's see, whether we need to install initial sym_filter_entry */
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if (sym_filter_entry_sched) {
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sym_filter_entry = sym_filter_entry_sched;
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sym_filter_entry_sched = NULL;
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parse_source(sym_filter_entry);
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}
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syme = symbol__priv(al.sym);
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if (!syme->skip) {
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syme->count[counter]++;
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@ -1270,7 +1279,7 @@ static const struct option options[] = {
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OPT_BOOLEAN('i', "inherit", &inherit,
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"child tasks inherit counters"),
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OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
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"symbol to annotate - requires -k option"),
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"symbol to annotate"),
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OPT_BOOLEAN('z', "zero", &zero,
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"zero history across updates"),
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OPT_INTEGER('F', "freq", &freq,
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@ -1306,16 +1315,14 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
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symbol_conf.priv_size = (sizeof(struct sym_entry) +
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(nr_counters + 1) * sizeof(unsigned long));
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if (symbol_conf.vmlinux_name == NULL)
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symbol_conf.try_vmlinux_path = true;
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symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
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if (symbol__init() < 0)
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return -1;
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if (delay_secs < 1)
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delay_secs = 1;
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parse_source(sym_filter_entry);
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/*
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* User specified count overrides default frequency.
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*/
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