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perf symbols: Add symfs option for off-box analysis using specified tree 

The symfs argument allows analysis of perf.data file using a locally accessible
filesystem tree with debug symbols - e.g., tree created during image builds,
sshfs mount, loop mounted KVM disk images, USB keys, initrds, etc. Anything
with an OS tree can be analyzed from anywhere without the need to populate a
local data store with build-ids.

Commiter notes:

o Fixed up symfs="/" variants handling.

o prefixed DSO__ORIG_GUEST_KMODULE case with symfs too, avoiding use of files
  outside the symfs directory.

LKML-Reference: <1291926427-28846-1-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern 2010-12-09 13:27:07 -07:00 committed by Arnaldo Carvalho de Melo
parent eac23d1c38
commit ec5761eab3
9 changed files with 81 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/Documentation/perf-diff.txt
View File

@ -66,6 +66,8 @@ OPTIONS
--force::
Don't complain, do it.
--symfs=<directory>::
Look for files with symbols relative to this directory.
SEE ALSO
--------

3
tools/perf/Documentation/perf-report.txt
View File

@ -116,6 +116,9 @@ OPTIONS
--force::
Don't complain, do it.
--symfs=<directory>::
Look for files with symbols relative to this directory.
SEE ALSO
--------
linkperf:perf-stat[1]

2
tools/perf/Documentation/perf-timechart.txt
View File

@ -38,6 +38,8 @@ OPTIONS
--process::
Select the processes to display, by name or PID
--symfs=<directory>::
Look for files with symbols relative to this directory.
SEE ALSO
--------

2
tools/perf/builtin-diff.c
View File

@ -194,6 +194,8 @@ static const struct option options[] = {
OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
"separator for columns, no spaces will be added between "
"columns '.' is reserved."),
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_END()
};

2
tools/perf/builtin-report.c
View File

@ -483,6 +483,8 @@ static const struct option options[] = {
"columns '.' is reserved."),
OPT_BOOLEAN('U', "hide-unresolved", &hide_unresolved,
"Only display entries resolved to a symbol"),
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_END()
};

2
tools/perf/builtin-timechart.c
View File

@ -1022,6 +1022,8 @@ static const struct option options[] = {
OPT_CALLBACK('p', "process", NULL, "process",
"process selector. Pass a pid or process name.",
parse_process),
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_END()
};

14
tools/perf/util/hist.c
View File

@ -1092,6 +1092,12 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head,
FILE *file;
int err = 0;
u64 len;
char symfs_filename[PATH_MAX];
if (filename) {
snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
symbol_conf.symfs, filename);
}
if (filename == NULL) {
if (dso->has_build_id) {
@ -1100,9 +1106,9 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head,
return -ENOMEM;
}
goto fallback;
} else if (readlink(filename, command, sizeof(command)) < 0 ||
} else if (readlink(symfs_filename, command, sizeof(command)) < 0 ||
strstr(command, "[kernel.kallsyms]") ||
access(filename, R_OK)) {
access(symfs_filename, R_OK)) {
free(filename);
fallback:
/*
@ -1111,6 +1117,8 @@ fallback:
* DSO is the same as when 'perf record' ran.
*/
filename = dso->long_name;
snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
symbol_conf.symfs, filename);
free_filename = false;
}
@ -1137,7 +1145,7 @@ fallback:
"objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS -C %s|grep -v %s|expand",
map__rip_2objdump(map, sym->start),
map__rip_2objdump(map, sym->end),
filename, filename);
symfs_filename, filename);
pr_debug("Executing: %s\n", command);

72
tools/perf/util/symbol.c
View File

@ -41,6 +41,7 @@ struct symbol_conf symbol_conf = {
.exclude_other = true,
.use_modules = true,
.try_vmlinux_path = true,
.symfs = "",
};
int dso__name_len(const struct dso *self)
@ -839,8 +840,11 @@ static int dso__synthesize_plt_symbols(struct dso *self, struct map *map,
char sympltname[1024];
Elf *elf;
int nr = 0, symidx, fd, err = 0;
char name[PATH_MAX];
fd = open(self->long_name, O_RDONLY);
snprintf(name, sizeof(name), "%s%s",
symbol_conf.symfs, self->long_name);
fd = open(name, O_RDONLY);
if (fd < 0)
goto out;
@ -1452,16 +1456,19 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
self->origin++) {
switch (self->origin) {
case DSO__ORIG_BUILD_ID_CACHE:
if (dso__build_id_filename(self, name, size) == NULL)
/* skip the locally configured cache if a symfs is given */
if (symbol_conf.symfs[0] ||
(dso__build_id_filename(self, name, size) == NULL)) {
continue;
}
break;
case DSO__ORIG_FEDORA:
snprintf(name, size, "/usr/lib/debug%s.debug",
self->long_name);
snprintf(name, size, "%s/usr/lib/debug%s.debug",
symbol_conf.symfs, self->long_name);
break;
case DSO__ORIG_UBUNTU:
snprintf(name, size, "/usr/lib/debug%s",
self->long_name);
snprintf(name, size, "%s/usr/lib/debug%s",
symbol_conf.symfs, self->long_name);
break;
case DSO__ORIG_BUILDID: {
char build_id_hex[BUILD_ID_SIZE * 2 + 1];
@ -1473,19 +1480,26 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
sizeof(self->build_id),
build_id_hex);
snprintf(name, size,
"/usr/lib/debug/.build-id/%.2s/%s.debug",
build_id_hex, build_id_hex + 2);
"%s/usr/lib/debug/.build-id/%.2s/%s.debug",
symbol_conf.symfs, build_id_hex, build_id_hex + 2);
}
break;
case DSO__ORIG_DSO:
snprintf(name, size, "%s", self->long_name);
snprintf(name, size, "%s%s",
symbol_conf.symfs, self->long_name);
break;
case DSO__ORIG_GUEST_KMODULE:
if (map->groups && map->groups->machine)
root_dir = map->groups->machine->root_dir;
else
root_dir = "";
snprintf(name, size, "%s%s", root_dir, self->long_name);
snprintf(name, size, "%s%s%s", symbol_conf.symfs,
root_dir, self->long_name);
break;
case DSO__ORIG_KMODULE:
snprintf(name, size, "%s%s", symbol_conf.symfs,
self->long_name);
break;
default:
@ -1784,17 +1798,20 @@ static int dso__load_vmlinux(struct dso *self, struct map *map,
const char *vmlinux, symbol_filter_t filter)
{
int err = -1, fd;
char symfs_vmlinux[PATH_MAX];
fd = open(vmlinux, O_RDONLY);
snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s/%s",
symbol_conf.symfs, vmlinux);
fd = open(symfs_vmlinux, O_RDONLY);
if (fd < 0)
return -1;
dso__set_loaded(self, map->type);
err = dso__load_sym(self, map, vmlinux, fd, filter, 0, 0);
err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
close(fd);
if (err > 0)
pr_debug("Using %s for symbols\n", vmlinux);
pr_debug("Using %s for symbols\n", symfs_vmlinux);
return err;
}
@ -1872,6 +1889,10 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
goto out_fixup;
}
/* do not try local files if a symfs was given */
if (symbol_conf.symfs[0] != 0)
return -1;
/*
* Say the kernel DSO was created when processing the build-id header table,
* we have a build-id, so check if it is the same as the running kernel,
@ -2262,9 +2283,6 @@ static int vmlinux_path__init(void)
struct utsname uts;
char bf[PATH_MAX];
if (uname(&uts) < 0)
return -1;
vmlinux_path = malloc(sizeof(char *) * 5);
if (vmlinux_path == NULL)
return -1;
@ -2277,6 +2295,14 @@ static int vmlinux_path__init(void)
if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
goto out_fail;
++vmlinux_path__nr_entries;
/* only try running kernel version if no symfs was given */
if (symbol_conf.symfs[0] != 0)
return 0;
if (uname(&uts) < 0)
return -1;
snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
@ -2336,6 +2362,8 @@ static int setup_list(struct strlist **list, const char *list_str,
int symbol__init(void)
{
const char *symfs;
if (symbol_conf.initialized)
return 0;
@ -2364,6 +2392,18 @@ int symbol__init(void)
symbol_conf.sym_list_str, "symbol") < 0)
goto out_free_comm_list;
/*
* A path to symbols of "/" is identical to ""
* reset here for simplicity.
*/
symfs = realpath(symbol_conf.symfs, NULL);
if (symfs == NULL)
symfs = symbol_conf.symfs;
if (strcmp(symfs, "/") == 0)
symbol_conf.symfs = "";
if (symfs != symbol_conf.symfs)
free((void *)symfs);
symbol_conf.initialized = true;
return 0;

1
tools/perf/util/symbol.h
View File

@ -86,6 +86,7 @@ struct symbol_conf {
struct strlist *dso_list,
*comm_list,
*sym_list;
const char *symfs;
};
extern struct symbol_conf symbol_conf;