perf symbols: Look for vmlinux in more places
Now that we can check the buildid to see if it really matches,
this can be done safely:
vmlinux
/boot/vmlinux
/boot/vmlinux-<uts.release>
/lib/modules/<uts.release>/build/vmlinux
/usr/lib/debug/lib/modules/%s/vmlinux
More can be added - if you know about distros that put the
vmlinux somewhere else please let us know.
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: <1259001550-8194-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 74b5b8a..44d81d5 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -34,6 +34,8 @@
static int dso__load_kernel_sym(struct dso *self, struct map *map,
symbol_filter_t filter);
unsigned int symbol__priv_size;
+static int vmlinux_path__nr_entries;
+static char **vmlinux_path;
static struct rb_root kernel_maps;
@@ -1386,15 +1388,43 @@
static int dso__load_kernel_sym(struct dso *self, struct map *map,
symbol_filter_t filter)
{
- int err = dso__load_vmlinux(self, map, self->name, filter);
+ int err;
+ bool is_kallsyms;
+ if (vmlinux_path != NULL) {
+ int i;
+ pr_debug("Looking at the vmlinux_path (%d entries long)\n",
+ vmlinux_path__nr_entries);
+ for (i = 0; i < vmlinux_path__nr_entries; ++i) {
+ err = dso__load_vmlinux(self, map, vmlinux_path[i],
+ filter);
+ if (err > 0) {
+ pr_debug("Using %s for symbols\n",
+ vmlinux_path[i]);
+ dso__set_long_name(self,
+ strdup(vmlinux_path[i]));
+ goto out_fixup;
+ }
+ }
+ }
+
+ is_kallsyms = self->long_name[0] == '[';
+ if (is_kallsyms)
+ goto do_kallsyms;
+
+ err = dso__load_vmlinux(self, map, self->long_name, filter);
if (err <= 0) {
+ pr_info("The file %s cannot be used, "
+ "trying to use /proc/kallsyms...", self->long_name);
+ sleep(2);
+do_kallsyms:
err = kernel_maps__load_kallsyms(filter);
- if (err > 0)
+ if (err > 0 && !is_kallsyms)
dso__set_long_name(self, strdup("[kernel.kallsyms]"));
}
if (err > 0) {
+out_fixup:
map__fixup_start(map);
map__fixup_end(map);
}
@@ -1403,9 +1433,7 @@
}
LIST_HEAD(dsos);
-struct dso *vdso;
-
-const char *vmlinux_name = "vmlinux";
+struct dso *vdso;
static void dsos__add(struct dso *dso)
{
@@ -1457,9 +1485,9 @@
return ret;
}
-static int kernel_maps__create_kernel_map(void)
+static int kernel_maps__create_kernel_map(const char *vmlinux_name)
{
- struct dso *kernel = dso__new(vmlinux_name);
+ struct dso *kernel = dso__new(vmlinux_name ?: "[kernel.kallsyms]");
if (kernel == NULL)
return -1;
@@ -1468,10 +1496,10 @@
if (kernel_map == NULL)
goto out_delete_kernel_dso;
- kernel_map->map_ip = kernel_map->unmap_ip = identity__map_ip;
+ kernel_map->map_ip = kernel_map->unmap_ip = identity__map_ip;
+ kernel->short_name = "[kernel]";
+ kernel->kernel = 1;
- kernel->short_name = "[kernel]";
- kernel->kernel = 1;
vdso = dso__new("[vdso]");
if (vdso == NULL)
goto out_delete_kernel_map;
@@ -1494,11 +1522,72 @@
return -1;
}
-int kernel_maps__init(bool use_modules)
+static void vmlinux_path__exit(void)
{
- if (kernel_maps__create_kernel_map() < 0)
+ while (--vmlinux_path__nr_entries >= 0) {
+ free(vmlinux_path[vmlinux_path__nr_entries]);
+ vmlinux_path[vmlinux_path__nr_entries] = NULL;
+ }
+
+ free(vmlinux_path);
+ vmlinux_path = NULL;
+}
+
+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;
+
+ vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
+ if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+ goto out_fail;
+ ++vmlinux_path__nr_entries;
+ vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
+ if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+ goto out_fail;
+ ++vmlinux_path__nr_entries;
+ 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)
+ goto out_fail;
+ ++vmlinux_path__nr_entries;
+ snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
+ vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
+ if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+ goto out_fail;
+ ++vmlinux_path__nr_entries;
+ snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
+ uts.release);
+ vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
+ if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+ goto out_fail;
+ ++vmlinux_path__nr_entries;
+
+ return 0;
+
+out_fail:
+ vmlinux_path__exit();
+ return -1;
+}
+
+int kernel_maps__init(const char *vmlinux_name, bool try_vmlinux_path,
+ bool use_modules)
+{
+ if (try_vmlinux_path && vmlinux_path__init() < 0)
+ return -1;
+
+ if (kernel_maps__create_kernel_map(vmlinux_name) < 0) {
+ vmlinux_path__exit();
+ return -1;
+ }
+
if (use_modules && kernel_maps__create_module_maps() < 0)
pr_debug("Failed to load list of modules in use, "
"continuing...\n");
