perf: 'perf kvm' tool for monitoring guest performance from host

Here is the patch of userspace perf tool.

Signed-off-by: Zhang Yanmin <yanmin_zhang@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 513aa8a55db6..db474bbf3322 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -351,6 +351,7 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
                            int n_lines, int is_caller)
 {
         struct rb_node *next;
+        struct kernel_info *kerninfo;
 
         printf("%.102s\n", graph_dotted_line);
         printf(" %-34s |",  is_caller ? "Callsite": "Alloc Ptr");
@@ -359,10 +360,16 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
 
         next = rb_first(root);
 
+        kerninfo = kerninfo__findhost(&session->kerninfo_root);
+        if (!kerninfo) {
+                pr_err("__print_result: couldn't find kernel information\n");
+                return;
+        }
         while (next && n_lines--) {
                 struct alloc_stat *data = rb_entry(next, struct alloc_stat,
                                                    node);
                 struct symbol *sym = NULL;
+                struct map_groups *kmaps = &kerninfo->kmaps;
                 struct map *map;
                 char buf[BUFSIZ];
                 u64 addr;
@@ -370,8 +377,8 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
                 if (is_caller) {
                         addr = data->call_site;
                         if (!raw_ip)
-                                sym = map_groups__find_function(&session->kmaps,
-                                                                addr, &map, NULL);
+                                sym = map_groups__find_function(kmaps, addr,
+                                                                &map, NULL);
                 } else
                         addr = data->ptr;