5 files changed, 37 insertions, 13 deletions

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index a25f3ee..65269b8 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -8,6 +8,7 @@
 #include "sort.h"
 #include "strlist.h"
 #include "thread.h"
+#include "vdso.h"
 #include <stdbool.h>
 #include <symbol/kallsyms.h>
 #include "unwind.h"
@@ -23,6 +24,8 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
 	INIT_LIST_HEAD(&machine->dead_threads);
 	machine->last_match = NULL;
 
+	machine->vdso_info = NULL;
+
 	machine->kmaps.machine = machine;
 	machine->pid = pid;
 
@@ -105,6 +108,7 @@ void machine__exit(struct machine *machine)
 	map_groups__exit(&machine->kmaps);
 	dsos__delete(&machine->user_dsos);
 	dsos__delete(&machine->kernel_dsos);
+	vdso__exit(machine);
 	zfree(&machine->root_dir);
 	zfree(&machine->current_tid);
 }
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 8771d0c..b972824 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -20,6 +20,8 @@ union perf_event;
 
 extern const char *ref_reloc_sym_names[];
 
+struct vdso_info;
+
 struct machine {
 	struct rb_node	  rb_node;
 	pid_t		  pid;
@@ -28,6 +30,7 @@ struct machine {
 	struct rb_root	  threads;
 	struct list_head  dead_threads;
 	struct thread	  *last_match;
+	struct vdso_info  *vdso_info;
 	struct list_head  user_dsos;
 	struct list_head  kernel_dsos;
 	struct map_groups kmaps;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index d3da105..fab5838 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -14,7 +14,6 @@
 #include "util.h"
 #include "cpumap.h"
 #include "perf_regs.h"
-#include "vdso.h"
 
 static int perf_session__open(struct perf_session *session)
 {
@@ -156,7 +155,6 @@ void perf_session__delete(struct perf_session *session)
 	if (session->file)
 		perf_data_file__close(session->file);
 	free(session);
-	vdso__exit();
 }
 
 static int process_event_synth_tracing_data_stub(struct perf_tool *tool
diff --git a/tools/perf/util/vdso.c b/tools/perf/util/vdso.c
index 75245f0..fdaccaf 100644
--- a/tools/perf/util/vdso.c
+++ b/tools/perf/util/vdso.c
@@ -28,14 +28,17 @@ struct vdso_info {
 	struct vdso_file vdso;
 };
 
-static struct vdso_info vdso_info_ = {
-	.vdso = {
-		.temp_file_name = VDSO__TEMP_FILE_NAME,
-		.dso_name = VDSO__MAP_NAME,
-	},
-};
-
-static struct vdso_info *vdso_info = &vdso_info_;
+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 = VDSO__MAP_NAME,
+		},
+	};
+
+	return memdup(&vdso_info_init, sizeof(vdso_info_init));
+}
 
 static int find_vdso_map(void **start, void **end)
 {
@@ -105,16 +108,32 @@ static char *get_file(struct vdso_file *vdso_file)
 	return vdso;
 }
 
-void vdso__exit(void)
+void vdso__exit(struct machine *machine)
 {
+	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 machine *machine)
 {
-	struct dso *dso = dsos__find(&machine->user_dsos, VDSO__MAP_NAME, true);
+	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, VDSO__MAP_NAME, true);
 	if (!dso) {
 		char *file;
 
diff --git a/tools/perf/util/vdso.h b/tools/perf/util/vdso.h
index 9ab0738..7cf1576 100644
--- a/tools/perf/util/vdso.h
+++ b/tools/perf/util/vdso.h
@@ -15,6 +15,6 @@ static inline bool is_vdso_map(const char *filename)
 struct machine;
 
 struct dso *vdso__dso_findnew(struct machine *machine);
-void vdso__exit(void);
+void vdso__exit(struct machine *machine);
 
 #endif /* __PERF_VDSO__ */