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Date: Mon, 23 Nov 2009 16:39:10 -0200
From: Arnaldo Carvalho de Melo <acme@...radead.org>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Frédéric Weisbecker <fweisbec@...il.com>,
Mike Galbraith <efault@....de>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>
Subject: [PATCH 1/1] perf symbols: Look for vmlinux in more places
From: Arnaldo Carvalho de Melo <acme@...hat.com>
Now that we can check the buildid to see if it really matches, this can
be done safely.
Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/builtin-annotate.c | 3 +-
tools/perf/builtin-kmem.c | 2 +-
tools/perf/builtin-report.c | 6 ++-
tools/perf/builtin-sched.c | 3 +-
tools/perf/builtin-top.c | 3 +-
tools/perf/builtin-trace.c | 3 +-
tools/perf/util/data_map.c | 4 +-
tools/perf/util/data_map.h | 2 +
tools/perf/util/header.c | 2 +-
tools/perf/util/symbol.c | 113 ++++++++++++++++++++++++++++++++++++----
tools/perf/util/symbol.h | 4 +-
11 files changed, 122 insertions(+), 23 deletions(-)
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 2031527..6b13a1e 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -37,6 +37,7 @@ static bool use_modules;
static unsigned long page_size;
static unsigned long mmap_window = 32;
+const char *vmlinux_name;
struct sym_hist {
u64 sum;
@@ -637,7 +638,7 @@ static int __cmd_annotate(void)
exit(0);
}
- if (kernel_maps__init(use_modules) < 0) {
+ if (kernel_maps__init(vmlinux_name, true, use_modules) < 0) {
pr_err("failed to create kernel maps for symbol resolution\b");
return -1;
}
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 4145049..5d8aeae 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -291,7 +291,7 @@ static int read_events(void)
register_idle_thread();
register_perf_file_handler(&file_handler);
- return mmap_dispatch_perf_file(&header, input_name, 0, 0,
+ return mmap_dispatch_perf_file(&header, input_name, NULL, false, 0, 0,
&cwdlen, &cwd);
}
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 7e690f7..fe474b7 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -52,6 +52,7 @@ static char *pretty_printing_style = default_pretty_printing_style;
static int exclude_other = 1;
static char callchain_default_opt[] = "fractal,0.5";
+const char *vmlinux_name;
static char *cwd;
static int cwdlen;
@@ -925,8 +926,9 @@ static int __cmd_report(void)
register_perf_file_handler(&file_handler);
- ret = mmap_dispatch_perf_file(&header, input_name, force, full_paths,
- &cwdlen, &cwd);
+ ret = mmap_dispatch_perf_file(&header, input_name, vmlinux_name,
+ !vmlinux_name, force,
+ full_paths, &cwdlen, &cwd);
if (ret)
return ret;
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index df44b75..260f57a 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1718,7 +1718,8 @@ static int read_events(void)
register_idle_thread();
register_perf_file_handler(&file_handler);
- return mmap_dispatch_perf_file(&header, input_name, 0, 0, &cwdlen, &cwd);
+ return mmap_dispatch_perf_file(&header, input_name, NULL, false, 0, 0,
+ &cwdlen, &cwd);
}
static void print_bad_events(void)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index ea49c2e..eef9caa 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -79,6 +79,7 @@ static int dump_symtab = 0;
static bool hide_kernel_symbols = false;
static bool hide_user_symbols = false;
static struct winsize winsize;
+const char *vmlinux_name;
static const char *graph_line =
"_____________________________________________________________________"
"_____________________________________________________________________";
@@ -1341,7 +1342,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
if (delay_secs < 1)
delay_secs = 1;
- err = kernel_maps__init(true);
+ err = kernel_maps__init(vmlinux_name, !vmlinux_name, true);
if (err < 0)
return err;
parse_source(sym_filter_entry);
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d042d65..b71198e 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -131,7 +131,8 @@ static int __cmd_trace(void)
register_idle_thread();
register_perf_file_handler(&file_handler);
- return mmap_dispatch_perf_file(&header, input_name, 0, 0, &cwdlen, &cwd);
+ return mmap_dispatch_perf_file(&header, input_name, NULL, false,
+ 0, 0, &cwdlen, &cwd);
}
static const char * const annotate_usage[] = {
diff --git a/tools/perf/util/data_map.c b/tools/perf/util/data_map.c
index e7b6c2b..f318d19 100644
--- a/tools/perf/util/data_map.c
+++ b/tools/perf/util/data_map.c
@@ -101,6 +101,8 @@ out:
int mmap_dispatch_perf_file(struct perf_header **pheader,
const char *input_name,
+ const char *vmlinux_name,
+ bool try_vmlinux_path,
int force,
int full_paths,
int *cwdlen,
@@ -171,7 +173,7 @@ int mmap_dispatch_perf_file(struct perf_header **pheader,
goto out_delete;
err = -ENOMEM;
- if (kernel_maps__init(true) < 0) {
+ if (kernel_maps__init(vmlinux_name, try_vmlinux_path, true) < 0) {
pr_err("failed to setup the kernel maps to resolve symbols\n");
goto out_delete;
}
diff --git a/tools/perf/util/data_map.h b/tools/perf/util/data_map.h
index ae036ec..3f0d21b 100644
--- a/tools/perf/util/data_map.h
+++ b/tools/perf/util/data_map.h
@@ -23,6 +23,8 @@ struct perf_file_handler {
void register_perf_file_handler(struct perf_file_handler *handler);
int mmap_dispatch_perf_file(struct perf_header **pheader,
const char *input_name,
+ const char *vmlinux_name,
+ bool try_vmlinux_path,
int force,
int full_paths,
int *cwdlen,
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index ac3410b..1332f8e 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -257,7 +257,7 @@ static int perf_header__adds_write(struct perf_header *self, int fd)
* Read the kernel buildid nad the list of loaded modules with
* its build_ids:
*/
- kernel_maps__init(true);
+ kernel_maps__init(NULL, false, true);
/* Write build-ids */
buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
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 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 int vmlinux_path__nr_entries;
+static char **vmlinux_path;
static struct rb_root kernel_maps;
@@ -1386,15 +1388,43 @@ static int dso__load_vmlinux(struct dso *self, struct map *map,
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 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
}
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 @@ size_t dsos__fprintf_buildid(FILE *fp)
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 @@ static int kernel_maps__create_kernel_map(void)
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 @@ out_delete_kernel_dso:
return -1;
}
-int kernel_maps__init(bool use_modules)
+static void vmlinux_path__exit(void)
+{
+ 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 (kernel_maps__create_kernel_map() < 0)
+ 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");
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 7a12904..8c4d026 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -93,7 +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);
-int kernel_maps__init(bool use_modules);
+int kernel_maps__init(const char *vmlinux_name, bool try_vmlinux_path,
+ bool use_modules);
size_t kernel_maps__fprintf(FILE *fp);
void symbol__init(unsigned int priv_size);
@@ -101,5 +102,4 @@ void symbol__init(unsigned int priv_size);
extern struct list_head dsos;
extern struct map *kernel_map;
extern struct dso *vdso;
-extern const char *vmlinux_name;
#endif /* __PERF_SYMBOL */
--
1.6.2.5
--
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