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Diffstat (limited to 'tools/perf/util/vdso.c')
-rw-r--r--tools/perf/util/vdso.c96
1 files changed, 76 insertions, 20 deletions
diff --git a/tools/perf/util/vdso.c b/tools/perf/util/vdso.c
index 290582452da3..adca69384fcc 100644
--- a/tools/perf/util/vdso.c
+++ b/tools/perf/util/vdso.c
@@ -11,11 +11,34 @@
#include "vdso.h"
#include "util.h"
#include "symbol.h"
+#include "machine.h"
#include "linux/string.h"
#include "debug.h"
-static bool vdso_found;
-static char vdso_file[] = "/tmp/perf-vdso.so-XXXXXX";
+#define VDSO__TEMP_FILE_NAME "/tmp/perf-vdso.so-XXXXXX"
+
+struct vdso_file {
+ bool found;
+ bool error;
+ char temp_file_name[sizeof(VDSO__TEMP_FILE_NAME)];
+ const char *dso_name;
+};
+
+struct vdso_info {
+ struct vdso_file vdso;
+};
+
+static struct vdso_info *vdso_info__new(void)
+{
+ static const struct vdso_info vdso_info_init = {
+ .vdso = {
+ .temp_file_name = VDSO__TEMP_FILE_NAME,
+ .dso_name = DSO__NAME_VDSO,
+ },
+ };
+
+ return memdup(&vdso_info_init, sizeof(vdso_info_init));
+}
static int find_vdso_map(void **start, void **end)
{
@@ -48,7 +71,7 @@ static int find_vdso_map(void **start, void **end)
return !found;
}
-static char *get_file(void)
+static char *get_file(struct vdso_file *vdso_file)
{
char *vdso = NULL;
char *buf = NULL;
@@ -56,10 +79,10 @@ static char *get_file(void)
size_t size;
int fd;
- if (vdso_found)
- return vdso_file;
+ if (vdso_file->found)
+ return vdso_file->temp_file_name;
- if (find_vdso_map(&start, &end))
+ if (vdso_file->error || find_vdso_map(&start, &end))
return NULL;
size = end - start;
@@ -68,45 +91,78 @@ static char *get_file(void)
if (!buf)
return NULL;
- fd = mkstemp(vdso_file);
+ fd = mkstemp(vdso_file->temp_file_name);
if (fd < 0)
goto out;
if (size == (size_t) write(fd, buf, size))
- vdso = vdso_file;
+ vdso = vdso_file->temp_file_name;
close(fd);
out:
free(buf);
- vdso_found = (vdso != NULL);
+ vdso_file->found = (vdso != NULL);
+ vdso_file->error = !vdso_file->found;
return vdso;
}
-void vdso__exit(void)
+void vdso__exit(struct machine *machine)
{
- if (vdso_found)
- unlink(vdso_file);
+ struct vdso_info *vdso_info = machine->vdso_info;
+
+ if (!vdso_info)
+ return;
+
+ if (vdso_info->vdso.found)
+ unlink(vdso_info->vdso.temp_file_name);
+
+ zfree(&machine->vdso_info);
}
-struct dso *vdso__dso_findnew(struct list_head *head)
+static struct dso *vdso__new(struct machine *machine, const char *short_name,
+ const char *long_name)
{
- struct dso *dso = dsos__find(head, VDSO__MAP_NAME, true);
+ struct dso *dso;
+ dso = dso__new(short_name);
+ if (dso != NULL) {
+ dsos__add(&machine->user_dsos, dso);
+ dso__set_long_name(dso, long_name, false);
+ }
+
+ return dso;
+}
+
+struct dso *vdso__dso_findnew(struct machine *machine,
+ struct thread *thread __maybe_unused)
+{
+ struct vdso_info *vdso_info;
+ struct dso *dso;
+
+ if (!machine->vdso_info)
+ machine->vdso_info = vdso_info__new();
+
+ vdso_info = machine->vdso_info;
+ if (!vdso_info)
+ return NULL;
+
+ dso = dsos__find(&machine->user_dsos, DSO__NAME_VDSO, true);
if (!dso) {
char *file;
- file = get_file();
+ file = get_file(&vdso_info->vdso);
if (!file)
return NULL;
- dso = dso__new(VDSO__MAP_NAME);
- if (dso != NULL) {
- dsos__add(head, dso);
- dso__set_long_name(dso, file, false);
- }
+ dso = vdso__new(machine, DSO__NAME_VDSO, file);
}
return dso;
}
+
+bool dso__is_vdso(struct dso *dso)
+{
+ return !strcmp(dso->short_name, DSO__NAME_VDSO);
+}