COMM events are 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. Samples for guest mode are
currently displayed as:
99.67% :5671 [unknown] [g] 0xffffffff81366b41
where 5671 is the pid of the VMM. With this patch the samples in
guest mode are shown as:
18.43% [guest/5671] [unknown] [g] 0xffffffff810d68b7
Signed-off-by: David Ahern <dsah...@gmail.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Namhyung Kim <namhy...@gmail.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Peter Zijlstra <pet...@infradead.org>
---
tools/perf/util/map.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index a1f4e36..8668569 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)
--
1.7.10.1
--
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