perf symbols: Do lazy symtab loading for the kernel & modules too
Just like we do with the other DSOs. This also simplifies the kernel_maps setup process, now all that the tools need to do is to call kernel_maps__init and the maps for the modules and kernel will be created, then, later, when kernel_maps__find_symbol() is used, it will also call maps__find_symbol that already checks if the symtab was loaded, loading it if needed. Now if one does 'perf top --hide_kernel_symbols' we won't pay the price of loading the (many) symbols in /proc/kallsyms or vmlinux. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1258757489-5978-4-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo
Ingo Molnar
Родитель
78075caad9
Коммит
c338aee853
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@ -157,7 +157,7 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
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if (event->header.misc & PERF_RECORD_MISC_KERNEL) {
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level = 'k';
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sym = kernel_maps__find_symbol(ip, &map);
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sym = kernel_maps__find_symbol(ip, &map, symbol_filter);
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dump_printf(" ...... dso: %s\n",
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map ? map->dso->long_name : "<not found>");
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} else if (event->header.misc & PERF_RECORD_MISC_USER) {
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@ -637,9 +637,9 @@ static int __cmd_annotate(void)
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exit(0);
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}
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if (load_kernel(symbol_filter, use_modules) < 0) {
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perror("failed to load kernel symbols");
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return EXIT_FAILURE;
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if (kernel_maps__init(use_modules) < 0) {
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pr_err("failed to create kernel maps for symbol resolution\b");
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return -1;
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}
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remap:
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@ -449,7 +449,7 @@ got_map:
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* trick of looking in the whole kernel symbol list.
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*/
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if ((long long)ip < 0)
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return kernel_maps__find_symbol(ip, mapp);
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return kernel_maps__find_symbol(ip, mapp, NULL);
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}
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dump_printf(" ...... dso: %s\n",
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map ? map->dso->long_name : "<not found>");
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@ -496,7 +496,7 @@ static struct symbol **resolve_callchain(struct thread *thread, struct map *map,
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case PERF_CONTEXT_HV:
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break;
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case PERF_CONTEXT_KERNEL:
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sym = kernel_maps__find_symbol(ip, &map);
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sym = kernel_maps__find_symbol(ip, &map, NULL);
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break;
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default:
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sym = resolve_symbol(thread, &map, &ip);
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@ -716,7 +716,7 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
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if (cpumode == PERF_RECORD_MISC_KERNEL) {
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level = 'k';
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sym = kernel_maps__find_symbol(ip, &map);
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sym = kernel_maps__find_symbol(ip, &map, NULL);
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dump_printf(" ...... dso: %s\n",
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map ? map->dso->long_name : "<not found>");
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} else if (cpumode == PERF_RECORD_MISC_USER) {
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@ -830,6 +830,8 @@ static void handle_keypress(int c)
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case 'q':
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case 'Q':
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printf("exiting.\n");
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if (dump_symtab)
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dsos__fprintf(stderr);
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exit(0);
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case 's':
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prompt_symbol(&sym_filter_entry, "Enter details symbol");
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@ -946,30 +948,6 @@ static int symbol_filter(struct map *map, struct symbol *sym)
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return 0;
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}
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static int parse_symbols(void)
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{
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struct dso *kernel = dsos__load_kernel();
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if (kernel == NULL)
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return -1;
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if (dsos__load_modules() < 0)
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pr_debug("Couldn't read the complete list of modules, "
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"continuing...\n");
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if (dsos__load_modules_sym(symbol_filter) < 0)
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pr_warning("Failed to read module symbols, continuing...\n");
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if (dso__load_kernel_sym(kernel, symbol_filter, 1) <= 0)
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pr_debug("Couldn't read the complete list of kernel symbols, "
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"continuing...\n");
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if (dump_symtab)
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dsos__fprintf(stderr);
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return 0;
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}
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static void event__process_sample(const event_t *self, int counter)
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{
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u64 ip = self->ip.ip;
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@ -1012,7 +990,7 @@ static void event__process_sample(const event_t *self, int counter)
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if (hide_kernel_symbols)
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return;
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sym = kernel_maps__find_symbol(ip, &map);
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sym = kernel_maps__find_symbol(ip, &map, symbol_filter);
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if (sym == NULL)
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return;
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break;
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@ -1339,7 +1317,7 @@ static const struct option options[] = {
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int cmd_top(int argc, const char **argv, const char *prefix __used)
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{
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int counter;
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int counter, err;
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page_size = sysconf(_SC_PAGE_SIZE);
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@ -1363,10 +1341,11 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
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if (delay_secs < 1)
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delay_secs = 1;
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parse_symbols();
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err = kernel_maps__init(true);
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if (err < 0)
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return err;
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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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@ -171,8 +171,8 @@ int mmap_dispatch_perf_file(struct perf_header **pheader,
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goto out_delete;
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err = -ENOMEM;
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if (load_kernel(NULL, 1) < 0) {
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pr_err("failed to load kernel symbols\n");
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if (kernel_maps__init(true) < 0) {
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pr_err("failed to setup the kernel maps to resolve symbols\n");
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goto out_delete;
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}
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@ -115,10 +115,13 @@ typedef int (*symbol_filter_t)(struct map *map, struct symbol *sym);
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void map__init(struct map *self, u64 start, u64 end, u64 pgoff,
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struct dso *dso);
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struct map *map__new(struct mmap_event *event, char *cwd, int cwdlen);
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void map__delete(struct map *self);
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struct map *map__clone(struct map *self);
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int map__overlap(struct map *l, struct map *r);
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size_t map__fprintf(struct map *self, FILE *fp);
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struct symbol *map__find_symbol(struct map *self, u64 ip, symbol_filter_t filter);
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void map__fixup_start(struct map *self);
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void map__fixup_end(struct map *self);
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int event__synthesize_thread(pid_t pid, int (*process)(event_t *event));
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void event__synthesize_threads(int (*process)(event_t *event));
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@ -253,11 +253,11 @@ static int perf_header__adds_write(struct perf_header *self, int fd)
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buildid_sec = &feat_sec[idx++];
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dsos__load_kernel();
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/*
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* Read the list of loaded modules with its build_ids
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* Read the kernel buildid nad the list of loaded modules with
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* its build_ids:
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*/
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dsos__load_modules();
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kernel_maps__init(true);
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/* Write build-ids */
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buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
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@ -75,6 +75,29 @@ out_delete:
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return NULL;
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}
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void map__delete(struct map *self)
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{
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free(self);
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}
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void map__fixup_start(struct map *self)
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{
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struct rb_node *nd = rb_first(&self->dso->syms);
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if (nd != NULL) {
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struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
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self->start = sym->start;
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}
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}
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void map__fixup_end(struct map *self)
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{
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struct rb_node *nd = rb_last(&self->dso->syms);
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if (nd != NULL) {
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struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
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self->end = sym->end;
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}
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}
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#define DSO__DELETED "(deleted)"
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struct symbol *
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@ -27,6 +27,8 @@ static void dsos__add(struct dso *dso);
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static struct dso *dsos__find(const char *name);
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static struct map *map__new2(u64 start, struct dso *dso);
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static void kernel_maps__insert(struct map *map);
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static int dso__load_kernel_sym(struct dso *self, struct map *map,
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symbol_filter_t filter);
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unsigned int symbol__priv_size;
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static struct rb_root kernel_maps;
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@ -69,12 +71,6 @@ static void kernel_maps__fixup_end(void)
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curr = rb_entry(nd, struct map, rb_node);
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prev->end = curr->start - 1;
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}
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nd = rb_last(&curr->dso->syms);
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if (nd) {
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struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
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curr->end = sym->end;
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}
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}
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static struct symbol *symbol__new(u64 start, u64 len, const char *name)
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@ -324,7 +320,7 @@ out_failure:
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* kernel range is broken in several maps, named [kernel].N, as we don't have
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* the original ELF section names vmlinux have.
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*/
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static int kernel_maps__split_kallsyms(symbol_filter_t filter, int use_modules)
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static int kernel_maps__split_kallsyms(symbol_filter_t filter)
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{
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struct map *map = kernel_map;
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struct symbol *pos;
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@ -340,9 +336,6 @@ static int kernel_maps__split_kallsyms(symbol_filter_t filter, int use_modules)
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module = strchr(pos->name, '\t');
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if (module) {
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if (!use_modules)
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goto delete_symbol;
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*module++ = '\0';
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if (strcmp(map->dso->name, module)) {
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@ -382,7 +375,6 @@ static int kernel_maps__split_kallsyms(symbol_filter_t filter, int use_modules)
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}
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if (filter && filter(map, pos)) {
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delete_symbol:
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rb_erase(&pos->rb_node, &kernel_map->dso->syms);
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symbol__delete(pos);
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} else {
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@ -398,17 +390,18 @@ delete_symbol:
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}
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static int kernel_maps__load_kallsyms(symbol_filter_t filter, int use_modules)
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static int kernel_maps__load_kallsyms(symbol_filter_t filter)
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{
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if (kernel_maps__load_all_kallsyms())
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return -1;
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dso__fixup_sym_end(kernel_map->dso);
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kernel_map->dso->origin = DSO__ORIG_KERNEL;
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return kernel_maps__split_kallsyms(filter, use_modules);
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return kernel_maps__split_kallsyms(filter);
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}
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static size_t kernel_maps__fprintf(FILE *fp)
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size_t kernel_maps__fprintf(FILE *fp)
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{
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size_t printed = fprintf(fp, "Kernel maps:\n");
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struct rb_node *nd;
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@ -1042,13 +1035,17 @@ char dso__symtab_origin(const struct dso *self)
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int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
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{
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int size = PATH_MAX;
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char *name = malloc(size);
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char *name;
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u8 build_id[BUILD_ID_SIZE];
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int ret = -1;
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int fd;
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self->loaded = 1;
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if (self->kernel)
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return dso__load_kernel_sym(self, map, filter);
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name = malloc(size);
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if (!name)
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return -1;
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@ -1139,7 +1136,8 @@ static void kernel_maps__insert(struct map *map)
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maps__insert(&kernel_maps, map);
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}
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struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp)
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struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp,
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symbol_filter_t filter)
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{
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struct map *map = maps__find(&kernel_maps, ip);
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|
|
@ -1148,7 +1146,7 @@ struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp)
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|
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if (map) {
|
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ip = map->map_ip(map, ip);
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||||
return map->dso->find_symbol(map->dso, ip);
|
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return map__find_symbol(map, ip, filter);
|
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}
|
||||
|
||||
return NULL;
|
||||
|
|
@ -1168,28 +1166,9 @@ struct map *kernel_maps__find_by_dso_name(const char *name)
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|||
return NULL;
|
||||
}
|
||||
|
||||
static int dso__load_module_sym(struct dso *self, struct map *map,
|
||||
symbol_filter_t filter)
|
||||
{
|
||||
int err = 0, fd = open(self->long_name, O_RDONLY);
|
||||
|
||||
self->loaded = 1;
|
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|
||||
if (fd < 0) {
|
||||
pr_err("%s: cannot open %s\n", __func__, self->long_name);
|
||||
return err;
|
||||
}
|
||||
|
||||
err = dso__load_sym(self, map, self->long_name, fd, filter, 0, 1);
|
||||
close(fd);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int dsos__load_modules_sym_dir(char *dirname, symbol_filter_t filter)
|
||||
static int dsos__set_modules_path_dir(char *dirname)
|
||||
{
|
||||
struct dirent *dent;
|
||||
int nr_symbols = 0, err;
|
||||
DIR *dir = opendir(dirname);
|
||||
|
||||
if (!dir) {
|
||||
|
|
@ -1207,14 +1186,12 @@ static int dsos__load_modules_sym_dir(char *dirname, symbol_filter_t filter)
|
|||
|
||||
snprintf(path, sizeof(path), "%s/%s",
|
||||
dirname, dent->d_name);
|
||||
err = dsos__load_modules_sym_dir(path, filter);
|
||||
if (err < 0)
|
||||
if (dsos__set_modules_path_dir(path) < 0)
|
||||
goto failure;
|
||||
} else {
|
||||
char *dot = strrchr(dent->d_name, '.'),
|
||||
dso_name[PATH_MAX];
|
||||
struct map *map;
|
||||
struct rb_node *last;
|
||||
char *long_name;
|
||||
|
||||
if (dot == NULL || strcmp(dot, ".ko"))
|
||||
|
|
@ -1234,36 +1211,16 @@ static int dsos__load_modules_sym_dir(char *dirname, symbol_filter_t filter)
|
|||
if (long_name == NULL)
|
||||
goto failure;
|
||||
dso__set_long_name(map->dso, long_name);
|
||||
dso__set_basename(map->dso);
|
||||
|
||||
err = dso__load_module_sym(map->dso, map, filter);
|
||||
if (err < 0)
|
||||
goto failure;
|
||||
last = rb_last(&map->dso->syms);
|
||||
if (last) {
|
||||
struct symbol *sym;
|
||||
/*
|
||||
* We do this here as well, even having the
|
||||
* symbol size found in the symtab because
|
||||
* misannotated ASM symbols may have the size
|
||||
* set to zero.
|
||||
*/
|
||||
dso__fixup_sym_end(map->dso);
|
||||
|
||||
sym = rb_entry(last, struct symbol, rb_node);
|
||||
map->end = map->start + sym->end;
|
||||
}
|
||||
}
|
||||
nr_symbols += err;
|
||||
}
|
||||
|
||||
return nr_symbols;
|
||||
return 0;
|
||||
failure:
|
||||
closedir(dir);
|
||||
return -1;
|
||||
}
|
||||
|
||||
int dsos__load_modules_sym(symbol_filter_t filter)
|
||||
static int dsos__set_modules_path(void)
|
||||
{
|
||||
struct utsname uts;
|
||||
char modules_path[PATH_MAX];
|
||||
|
|
@ -1274,7 +1231,7 @@ int dsos__load_modules_sym(symbol_filter_t filter)
|
|||
snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel",
|
||||
uts.release);
|
||||
|
||||
return dsos__load_modules_sym_dir(modules_path, filter);
|
||||
return dsos__set_modules_path_dir(modules_path);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1296,7 +1253,7 @@ static struct map *map__new2(u64 start, struct dso *dso)
|
|||
return self;
|
||||
}
|
||||
|
||||
int dsos__load_modules(void)
|
||||
static int kernel_maps__create_module_maps(void)
|
||||
{
|
||||
char *line = NULL;
|
||||
size_t n;
|
||||
|
|
@ -1360,7 +1317,13 @@ int dsos__load_modules(void)
|
|||
free(line);
|
||||
fclose(file);
|
||||
|
||||
return 0;
|
||||
/*
|
||||
* Now that we have all sorted out, just set the ->end of all
|
||||
* maps:
|
||||
*/
|
||||
kernel_maps__fixup_end();
|
||||
|
||||
return dsos__set_modules_path();
|
||||
|
||||
out_delete_line:
|
||||
free(line);
|
||||
|
|
@ -1385,40 +1348,17 @@ static int dso__load_vmlinux(struct dso *self, struct map *map,
|
|||
return err;
|
||||
}
|
||||
|
||||
int dso__load_kernel_sym(struct dso *self, symbol_filter_t filter,
|
||||
int use_modules)
|
||||
static int dso__load_kernel_sym(struct dso *self, struct map *map,
|
||||
symbol_filter_t filter)
|
||||
{
|
||||
int err;
|
||||
int err = dso__load_vmlinux(self, map, self->name, filter);
|
||||
|
||||
kernel_map = map__new2(0, self);
|
||||
if (kernel_map == NULL)
|
||||
return -1;
|
||||
|
||||
kernel_map->map_ip = kernel_map->unmap_ip = identity__map_ip;
|
||||
|
||||
err = dso__load_vmlinux(self, kernel_map, self->name, filter);
|
||||
if (err <= 0)
|
||||
err = kernel_maps__load_kallsyms(filter, use_modules);
|
||||
err = kernel_maps__load_kallsyms(filter);
|
||||
|
||||
if (err > 0) {
|
||||
struct rb_node *node = rb_first(&self->syms);
|
||||
struct symbol *sym = rb_entry(node, struct symbol, rb_node);
|
||||
|
||||
kernel_map->start = sym->start;
|
||||
node = rb_last(&self->syms);
|
||||
sym = rb_entry(node, struct symbol, rb_node);
|
||||
kernel_map->end = sym->end;
|
||||
|
||||
self->origin = DSO__ORIG_KERNEL;
|
||||
kernel_maps__insert(kernel_map);
|
||||
/*
|
||||
* Now that we have all sorted out, just set the ->end of all
|
||||
* maps:
|
||||
*/
|
||||
kernel_maps__fixup_end();
|
||||
|
||||
if (verbose)
|
||||
kernel_maps__fprintf(stderr);
|
||||
map__fixup_start(map);
|
||||
map__fixup_end(map);
|
||||
}
|
||||
|
||||
return err;
|
||||
|
|
@ -1479,46 +1419,51 @@ size_t dsos__fprintf_buildid(FILE *fp)
|
|||
return ret;
|
||||
}
|
||||
|
||||
struct dso *dsos__load_kernel(void)
|
||||
static int kernel_maps__create_kernel_map(void)
|
||||
{
|
||||
struct dso *kernel = dso__new(vmlinux_name);
|
||||
|
||||
if (kernel == NULL)
|
||||
return NULL;
|
||||
return -1;
|
||||
|
||||
kernel_map = map__new2(0, kernel);
|
||||
if (kernel_map == NULL)
|
||||
goto out_delete_kernel_dso;
|
||||
|
||||
kernel_map->map_ip = kernel_map->unmap_ip = identity__map_ip;
|
||||
|
||||
kernel->short_name = "[kernel]";
|
||||
kernel->kernel = 1;
|
||||
vdso = dso__new("[vdso]");
|
||||
if (!vdso)
|
||||
return NULL;
|
||||
if (vdso == NULL)
|
||||
goto out_delete_kernel_map;
|
||||
|
||||
if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id,
|
||||
sizeof(kernel->build_id)) == 0)
|
||||
kernel->has_build_id = true;
|
||||
|
||||
kernel_maps__insert(kernel_map);
|
||||
dsos__add(kernel);
|
||||
dsos__add(vdso);
|
||||
|
||||
return kernel;
|
||||
return 0;
|
||||
|
||||
out_delete_kernel_map:
|
||||
map__delete(kernel_map);
|
||||
kernel_map = NULL;
|
||||
out_delete_kernel_dso:
|
||||
dso__delete(kernel);
|
||||
return -1;
|
||||
}
|
||||
|
||||
int load_kernel(symbol_filter_t filter, bool use_modules)
|
||||
int kernel_maps__init(bool use_modules)
|
||||
{
|
||||
struct dso *kernel = dsos__load_kernel();
|
||||
|
||||
if (kernel == NULL)
|
||||
if (kernel_maps__create_kernel_map() < 0)
|
||||
return -1;
|
||||
|
||||
if (use_modules) {
|
||||
if (dsos__load_modules() < 0)
|
||||
pr_warning("Failed to load list of modules in use, "
|
||||
"continuing...\n");
|
||||
else if (dsos__load_modules_sym(filter) < 0)
|
||||
pr_warning("Failed to read module symbols, "
|
||||
"continuing...\n");
|
||||
}
|
||||
|
||||
if (dso__load_kernel_sym(kernel, filter, use_modules) < 0)
|
||||
pr_warning("Failed to read kernel symbols, continuing...\n");
|
||||
if (use_modules && kernel_maps__create_module_maps() < 0)
|
||||
pr_warning("Failed to load list of modules in use, "
|
||||
"continuing...\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -64,6 +64,7 @@ struct dso {
|
|||
u8 slen_calculated:1;
|
||||
u8 loaded:1;
|
||||
u8 has_build_id:1;
|
||||
u8 kernel:1;
|
||||
unsigned char origin;
|
||||
u8 build_id[BUILD_ID_SIZE];
|
||||
u16 long_name_len;
|
||||
|
|
@ -77,12 +78,8 @@ void dso__delete(struct dso *self);
|
|||
|
||||
struct symbol *dso__find_symbol(struct dso *self, u64 ip);
|
||||
|
||||
int dsos__load_modules(void);
|
||||
int dsos__load_modules_sym(symbol_filter_t filter);
|
||||
struct dso *dsos__findnew(const char *name);
|
||||
int dso__load(struct dso *self, struct map *map, symbol_filter_t filter);
|
||||
int dso__load_kernel_sym(struct dso *self, symbol_filter_t filter,
|
||||
int use_modules);
|
||||
void dsos__fprintf(FILE *fp);
|
||||
size_t dsos__fprintf_buildid(FILE *fp);
|
||||
|
||||
|
|
@ -96,8 +93,8 @@ int sysfs__read_build_id(const char *filename, void *bf, size_t size);
|
|||
bool dsos__read_build_ids(void);
|
||||
int build_id__sprintf(u8 *self, int len, char *bf);
|
||||
|
||||
struct dso *dsos__load_kernel(void);
|
||||
int load_kernel(symbol_filter_t filter, bool use_modules);
|
||||
int kernel_maps__init(bool use_modules);
|
||||
size_t kernel_maps__fprintf(FILE *fp);
|
||||
|
||||
void symbol__init(unsigned int priv_size);
|
||||
|
||||
|
|
|
|||
|
|
@ -26,7 +26,8 @@ size_t threads__fprintf(FILE *fp);
|
|||
void maps__insert(struct rb_root *maps, struct map *map);
|
||||
struct map *maps__find(struct rb_root *maps, u64 ip);
|
||||
|
||||
struct symbol *kernel_maps__find_symbol(const u64 ip, struct map **mapp);
|
||||
struct symbol *kernel_maps__find_symbol(const u64 ip, struct map **mapp,
|
||||
symbol_filter_t filter);
|
||||
struct map *kernel_maps__find_by_dso_name(const char *name);
|
||||
|
||||
static inline struct map *thread__find_map(struct thread *self, u64 ip)
|
||||
|
|
|
|||
Загрузка…
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