提交 c338aee8 编写于 作者: A Arnaldo Carvalho de Melo 提交者: Ingo Molnar

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: NArnaldo 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: NIngo Molnar <mingo@elte.hu>
上级 78075caa
......@@ -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:
......
......@@ -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) {
......
......@@ -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.
*/
......
......@@ -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;
}
......
......@@ -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));
......
......@@ -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);
......
......@@ -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 *
......
......@@ -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;
}
......
......@@ -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)
......
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