perf kvm: Set name for VM process in guest machine

COMM events are not generated in the context of a guest machine, so the
thread name is never set for the VMM process. For example, the qemu-kvm
name applies to the process in the host machine, not the guest machine.
So, samples for guest machines are currently displayed as:

    99.67%     :5671  [unknown]         [g] 0xffffffff81366b41

where 5671 is the pid of the VMM. With this patch the samples in the guest
machine are shown as:

    18.43%  [guest/5671]  [unknown]           [g] 0xffffffff810d68b7

Tested-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1342826756-64663-3-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 16 insertions, 1 deletions

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index a1f4e3669142..8668569d4b2a 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <unistd.h>
 #include "map.h"
+#include "thread.h"
 
 const char *map_type__name[MAP__NR_TYPES] = {
         [MAP__FUNCTION] = "Functions",
@@ -585,7 +586,21 @@ int machine__init(struct machine *self, const char *root_dir, pid_t pid)
         self->kmaps.machine = self;
         self->pid           = pid;
         self->root_dir      = strdup(root_dir);
-        return self->root_dir == NULL ? -ENOMEM : 0;
+        if (self->root_dir == NULL)
+                return -ENOMEM;
+
+        if (pid != HOST_KERNEL_ID) {
+                struct thread *thread = machine__findnew_thread(self, pid);
+                char comm[64];
+
+                if (thread == NULL)
+                        return -ENOMEM;
+
+                snprintf(comm, sizeof(comm), "[guest/%d]", pid);
+                thread__set_comm(thread, comm);
+        }
+
+        return 0;
 }
 
 static void dsos__delete(struct list_head *self)