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Subject[PATCH -tip v3 01/11] [BUGFIX] perf-probe: Fix to do exit call for symbol maps
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Date
Some perf-probe commands do symbol_init() but doesn't
do exit call. This fixes that to call symbol_exit()
and releases machine if needed.
This also merges init_vmlinux() and init_user_exec()
because both of them are doing similar things.
(init_user_exec() just skips init vmlinux related
symbol maps)

Changes from v2:
- Not to set symbol_conf.try_vmlinux_path in init_symbol_maps()
(Thanks to Namhyung Kim!)

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
tools/perf/util/probe-event.c | 104 ++++++++++++++++++++++-------------------
1 file changed, 56 insertions(+), 48 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d8b048c..9aa7783 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -73,31 +73,31 @@ static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
static int convert_name_to_addr(struct perf_probe_event *pev,
const char *exec);
static void clear_probe_trace_event(struct probe_trace_event *tev);
-static struct machine machine;
+static struct machine *host_machine;

/* Initialize symbol maps and path of vmlinux/modules */
-static int init_vmlinux(void)
+static int init_symbol_maps(bool user_only)
{
int ret;

symbol_conf.sort_by_name = true;
- if (symbol_conf.vmlinux_name == NULL)
- symbol_conf.try_vmlinux_path = true;
- else
- pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
ret = symbol__init();
if (ret < 0) {
pr_debug("Failed to init symbol map.\n");
goto out;
}

- ret = machine__init(&machine, "", HOST_KERNEL_ID);
- if (ret < 0)
- goto out;
+ if (host_machine || user_only) /* already initialized */
+ return 0;

- if (machine__create_kernel_maps(&machine) < 0) {
- pr_debug("machine__create_kernel_maps() failed.\n");
- goto out;
+ if (symbol_conf.vmlinux_name)
+ pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
+
+ host_machine = machine__new_host();
+ if (!host_machine) {
+ pr_debug("machine__new_host() failed.\n");
+ symbol__exit();
+ ret = -1;
}
out:
if (ret < 0)
@@ -105,21 +105,30 @@ out:
return ret;
}

+static void exit_symbol_maps(void)
+{
+ if (host_machine) {
+ machine__delete(host_machine);
+ host_machine = NULL;
+ }
+ symbol__exit();
+}
+
static struct symbol *__find_kernel_function_by_name(const char *name,
struct map **mapp)
{
- return machine__find_kernel_function_by_name(&machine, name, mapp,
+ return machine__find_kernel_function_by_name(host_machine, name, mapp,
NULL);
}

static struct map *kernel_get_module_map(const char *module)
{
struct rb_node *nd;
- struct map_groups *grp = &machine.kmaps;
+ struct map_groups *grp = &host_machine->kmaps;

/* A file path -- this is an offline module */
if (module && strchr(module, '/'))
- return machine__new_module(&machine, 0, module);
+ return machine__new_module(host_machine, 0, module);

if (!module)
module = "kernel";
@@ -141,7 +150,7 @@ static struct dso *kernel_get_module_dso(const char *module)
const char *vmlinux_name;

if (module) {
- list_for_each_entry(dso, &machine.kernel_dsos, node) {
+ list_for_each_entry(dso, &host_machine->kernel_dsos, node) {
if (strncmp(dso->short_name + 1, module,
dso->short_name_len - 2) == 0)
goto found;
@@ -150,7 +159,7 @@ static struct dso *kernel_get_module_dso(const char *module)
return NULL;
}

- map = machine.vmlinux_maps[MAP__FUNCTION];
+ map = host_machine->vmlinux_maps[MAP__FUNCTION];
dso = map->dso;

vmlinux_name = symbol_conf.vmlinux_name;
@@ -173,20 +182,6 @@ const char *kernel_get_module_path(const char *module)
return (dso) ? dso->long_name : NULL;
}

-static int init_user_exec(void)
-{
- int ret = 0;
-
- symbol_conf.try_vmlinux_path = false;
- symbol_conf.sort_by_name = true;
- ret = symbol__init();
-
- if (ret < 0)
- pr_debug("Failed to init symbol map.\n");
-
- return ret;
-}
-
static int convert_exec_to_group(const char *exec, char **result)
{
char *ptr1, *ptr2, *exec_copy;
@@ -563,7 +558,7 @@ static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
* Show line-range always requires debuginfo to find source file and
* line number.
*/
-int show_line_range(struct line_range *lr, const char *module)
+static int __show_line_range(struct line_range *lr, const char *module)
{
int l = 1;
struct line_node *ln;
@@ -573,10 +568,6 @@ int show_line_range(struct line_range *lr, const char *module)
char *tmp;

/* Search a line range */
- ret = init_vmlinux();
- if (ret < 0)
- return ret;
-
dinfo = open_debuginfo(module);
if (!dinfo) {
pr_warning("Failed to open debuginfo file.\n");
@@ -646,6 +637,19 @@ end:
return ret;
}

+int show_line_range(struct line_range *lr, const char *module)
+{
+ int ret;
+
+ ret = init_symbol_maps(false);
+ if (ret < 0)
+ return ret;
+ ret = __show_line_range(lr, module);
+ exit_symbol_maps();
+
+ return ret;
+}
+
static int show_available_vars_at(struct debuginfo *dinfo,
struct perf_probe_event *pev,
int max_vls, struct strfilter *_filter,
@@ -707,14 +711,15 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
int i, ret = 0;
struct debuginfo *dinfo;

- ret = init_vmlinux();
+ ret = init_symbol_maps(false);
if (ret < 0)
return ret;

dinfo = open_debuginfo(module);
if (!dinfo) {
pr_warning("Failed to open debuginfo file.\n");
- return -ENOENT;
+ ret = -ENOENT;
+ goto out;
}

setup_pager();
@@ -724,6 +729,8 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
externs);

debuginfo__delete(dinfo);
+out:
+ exit_symbol_maps();
return ret;
}

@@ -1807,7 +1814,7 @@ int show_perf_probe_events(void)
if (fd < 0)
return fd;

- ret = init_vmlinux();
+ ret = init_symbol_maps(false);
if (ret < 0)
return ret;

@@ -1820,6 +1827,7 @@ int show_perf_probe_events(void)
close(fd);
}

+ exit_symbol_maps();
return ret;
}

@@ -2135,12 +2143,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
if (pkgs == NULL)
return -ENOMEM;

- if (!pevs->uprobes)
- /* Init vmlinux path */
- ret = init_vmlinux();
- else
- ret = init_user_exec();
-
+ ret = init_symbol_maps(pevs->uprobes);
if (ret < 0) {
free(pkgs);
return ret;
@@ -2174,6 +2177,7 @@ end:
zfree(&pkgs[i].tevs);
}
free(pkgs);
+ exit_symbol_maps();

return ret;
}
@@ -2347,7 +2351,7 @@ static int available_kernel_funcs(const char *module)
struct map *map;
int ret;

- ret = init_vmlinux();
+ ret = init_symbol_maps(false);
if (ret < 0)
return ret;

@@ -2356,7 +2360,10 @@ static int available_kernel_funcs(const char *module)
pr_err("Failed to find %s map.\n", (module) ? : "kernel");
return -EINVAL;
}
- return __show_available_funcs(map);
+ ret = __show_available_funcs(map);
+ exit_symbol_maps();
+
+ return ret;
}

static int available_user_funcs(const char *target)
@@ -2364,7 +2371,7 @@ static int available_user_funcs(const char *target)
struct map *map;
int ret;

- ret = init_user_exec();
+ ret = init_symbol_maps(true);
if (ret < 0)
return ret;

@@ -2372,6 +2379,7 @@ static int available_user_funcs(const char *target)
ret = __show_available_funcs(map);
dso__delete(map->dso);
map__delete(map);
+ exit_symbol_maps();
return ret;
}




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