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perf symbols: Do lazy symtab loading for the kernel & modules too

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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 2009-11-20 20:51:27 -02:00 committed by Ingo Molnar
parent 78075caad9
commit c338aee853
10 changed files with 109 additions and 161 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
tools/perf/builtin-annotate.c
View File

@ -157,7 +157,7 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
if (event->header.misc & PERF_RECORD_MISC_KERNEL) {
level = 'k';
sym = kernel_maps__find_symbol(ip, &map);
sym = kernel_maps__find_symbol(ip, &map, symbol_filter);
dump_printf(" ...... dso: %s\n",
map ? map->dso->long_name : "<not found>");
} else if (event->header.misc & PERF_RECORD_MISC_USER) {
@ -637,9 +637,9 @@ static int __cmd_annotate(void)
exit(0);
}
if (load_kernel(symbol_filter, use_modules) < 0) {
perror("failed to load kernel symbols");
return EXIT_FAILURE;
if (kernel_maps__init(use_modules) < 0) {
pr_err("failed to create kernel maps for symbol resolution\b");
return -1;
}
remap:

6
tools/perf/builtin-report.c
View File

@ -449,7 +449,7 @@ resolve_symbol(struct thread *thread, struct map **mapp, u64 *ipp)
* trick of looking in the whole kernel symbol list.
*/
if ((long long)ip < 0)
return kernel_maps__find_symbol(ip, mapp);
return kernel_maps__find_symbol(ip, mapp, NULL);
}
dump_printf(" ...... dso: %s\n",
map ? map->dso->long_name : "<not found>");
@ -496,7 +496,7 @@ static struct symbol **resolve_callchain(struct thread *thread, struct map *map,
case PERF_CONTEXT_HV:
break;
case PERF_CONTEXT_KERNEL:
sym = kernel_maps__find_symbol(ip, &map);
sym = kernel_maps__find_symbol(ip, &map, NULL);
break;
default:
sym = resolve_symbol(thread, &map, &ip);
@ -716,7 +716,7 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
if (cpumode == PERF_RECORD_MISC_KERNEL) {
level = 'k';
sym = kernel_maps__find_symbol(ip, &map);
sym = kernel_maps__find_symbol(ip, &map, NULL);
dump_printf(" ...... dso: %s\n",
map ? map->dso->long_name : "<not found>");
} else if (cpumode == PERF_RECORD_MISC_USER) {

35
tools/perf/builtin-top.c
View File

@ -830,6 +830,8 @@ static void handle_keypress(int c)
case 'q':
case 'Q':
printf("exiting.\n");
if (dump_symtab)
dsos__fprintf(stderr);
exit(0);
case 's':
prompt_symbol(&sym_filter_entry, "Enter details symbol");
@ -946,30 +948,6 @@ static int symbol_filter(struct map *map, struct symbol *sym)
return 0;
}
static int parse_symbols(void)
{
struct dso *kernel = dsos__load_kernel();
if (kernel == NULL)
return -1;
if (dsos__load_modules() < 0)
pr_debug("Couldn't read the complete list of modules, "
"continuing...\n");
if (dsos__load_modules_sym(symbol_filter) < 0)
pr_warning("Failed to read module symbols, continuing...\n");
if (dso__load_kernel_sym(kernel, symbol_filter, 1) <= 0)
pr_debug("Couldn't read the complete list of kernel symbols, "
"continuing...\n");
if (dump_symtab)
dsos__fprintf(stderr);
return 0;
}
static void event__process_sample(const event_t *self, int counter)
{
u64 ip = self->ip.ip;
@ -1012,7 +990,7 @@ static void event__process_sample(const event_t *self, int counter)
if (hide_kernel_symbols)
return;
sym = kernel_maps__find_symbol(ip, &map);
sym = kernel_maps__find_symbol(ip, &map, symbol_filter);
if (sym == NULL)
return;
break;
@ -1339,7 +1317,7 @@ static const struct option options[] = {
int cmd_top(int argc, const char **argv, const char *prefix __used)
{
int counter;
int counter, err;
page_size = sysconf(_SC_PAGE_SIZE);
@ -1363,10 +1341,11 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
if (delay_secs < 1)
delay_secs = 1;
parse_symbols();
err = kernel_maps__init(true);
if (err < 0)
return err;
parse_source(sym_filter_entry);
/*
* User specified count overrides default frequency.
*/

4
tools/perf/util/data_map.c
View File

@ -171,8 +171,8 @@ int mmap_dispatch_perf_file(struct perf_header **pheader,
goto out_delete;
err = -ENOMEM;
if (load_kernel(NULL, 1) < 0) {
pr_err("failed to load kernel symbols\n");
if (kernel_maps__init(true) < 0) {
pr_err("failed to setup the kernel maps to resolve symbols\n");
goto out_delete;
}

3
tools/perf/util/event.h
View File

@ -115,10 +115,13 @@ typedef int (*symbol_filter_t)(struct map *map, struct symbol *sym);
void map__init(struct map *self, u64 start, u64 end, u64 pgoff,
struct dso *dso);
struct map *map__new(struct mmap_event *event, char *cwd, int cwdlen);
void map__delete(struct map *self);
struct map *map__clone(struct map *self);
int map__overlap(struct map *l, struct map *r);
size_t map__fprintf(struct map *self, FILE *fp);
struct symbol *map__find_symbol(struct map *self, u64 ip, symbol_filter_t filter);
void map__fixup_start(struct map *self);
void map__fixup_end(struct map *self);
int event__synthesize_thread(pid_t pid, int (*process)(event_t *event));
void event__synthesize_threads(int (*process)(event_t *event));

6
tools/perf/util/header.c
View File

@ -253,11 +253,11 @@ static int perf_header__adds_write(struct perf_header *self, int fd)
buildid_sec = &feat_sec[idx++];
dsos__load_kernel();
/*
* Read the list of loaded modules with its build_ids
* Read the kernel buildid nad the list of loaded modules with
* its build_ids:
*/
dsos__load_modules();
kernel_maps__init(true);
/* Write build-ids */
buildid_sec->offset = lseek(fd, 0, SEEK_CUR);

23
tools/perf/util/map.c
View File

@ -75,6 +75,29 @@ struct map *map__new(struct mmap_event *event, char *cwd, int cwdlen)
return NULL;
}
void map__delete(struct map *self)
{
free(self);
}
void map__fixup_start(struct map *self)
{
struct rb_node *nd = rb_first(&self->dso->syms);
if (nd != NULL) {
struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
self->start = sym->start;
}
}
void map__fixup_end(struct map *self)
{
struct rb_node *nd = rb_last(&self->dso->syms);
if (nd != NULL) {
struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
self->end = sym->end;
}
}
#define DSO__DELETED "(deleted)"
struct symbol *

173
tools/perf/util/symbol.c
View File

@ -27,6 +27,8 @@ static void dsos__add(struct dso *dso);
static struct dso *dsos__find(const char *name);
static struct map *map__new2(u64 start, struct dso *dso);
static void kernel_maps__insert(struct map *map);
static int dso__load_kernel_sym(struct dso *self, struct map *map,
symbol_filter_t filter);
unsigned int symbol__priv_size;
static struct rb_root kernel_maps;
@ -69,12 +71,6 @@ static void kernel_maps__fixup_end(void)
curr = rb_entry(nd, struct map, rb_node);
prev->end = curr->start - 1;
}
nd = rb_last(&curr->dso->syms);
if (nd) {
struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
curr->end = sym->end;
}
}
static struct symbol *symbol__new(u64 start, u64 len, const char *name)
@ -324,7 +320,7 @@ static int kernel_maps__load_all_kallsyms(void)
* kernel range is broken in several maps, named [kernel].N, as we don't have
* the original ELF section names vmlinux have.
*/
static int kernel_maps__split_kallsyms(symbol_filter_t filter, int use_modules)
static int kernel_maps__split_kallsyms(symbol_filter_t filter)
{
struct map *map = kernel_map;
struct symbol *pos;
@ -340,9 +336,6 @@ static int kernel_maps__split_kallsyms(symbol_filter_t filter, int use_modules)
module = strchr(pos->name, '\t');
if (module) {
if (!use_modules)
goto delete_symbol;
*module++ = '\0';
if (strcmp(map->dso->name, module)) {
@ -382,7 +375,6 @@ static int kernel_maps__split_kallsyms(symbol_filter_t filter, int use_modules)
}
if (filter && filter(map, pos)) {
delete_symbol:
rb_erase(&pos->rb_node, &kernel_map->dso->syms);
symbol__delete(pos);
} else {
@ -398,17 +390,18 @@ static int kernel_maps__split_kallsyms(symbol_filter_t filter, int use_modules)
}
static int kernel_maps__load_kallsyms(symbol_filter_t filter, int use_modules)
static int kernel_maps__load_kallsyms(symbol_filter_t filter)
{
if (kernel_maps__load_all_kallsyms())
return -1;
dso__fixup_sym_end(kernel_map->dso);
kernel_map->dso->origin = DSO__ORIG_KERNEL;
return kernel_maps__split_kallsyms(filter, use_modules);
return kernel_maps__split_kallsyms(filter);
}
static size_t kernel_maps__fprintf(FILE *fp)
size_t kernel_maps__fprintf(FILE *fp)
{
size_t printed = fprintf(fp, "Kernel maps:\n");
struct rb_node *nd;
@ -1042,13 +1035,17 @@ char dso__symtab_origin(const struct dso *self)
int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
{
int size = PATH_MAX;
char *name = malloc(size);
char *name;
u8 build_id[BUILD_ID_SIZE];
int ret = -1;
int fd;
self->loaded = 1;
if (self->kernel)
return dso__load_kernel_sym(self, map, filter);
name = malloc(size);
if (!name)
return -1;
@ -1139,7 +1136,8 @@ static void kernel_maps__insert(struct map *map)
maps__insert(&kernel_maps, map);
}
struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp)
struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp,
symbol_filter_t filter)
{
struct map *map = maps__find(&kernel_maps, ip);
@ -1148,7 +1146,7 @@ struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp)
if (map) {
ip = map->map_ip(map, ip);
return map->dso->find_symbol(map->dso, ip);
return map__find_symbol(map, ip, filter);
}
return NULL;
@ -1168,28 +1166,9 @@ struct map *kernel_maps__find_by_dso_name(const char *name)
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;
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;
}

9
tools/perf/util/symbol.h
View File

@ -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);

3
tools/perf/util/thread.h
View File

@ -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)