Messages in this thread Patch in this message | | | From | David Ahern <> | Subject | [PATCH 1/4] perf kvm: set name for VM process in guest machine | Date | Tue, 10 Jul 2012 15:48:11 -0600 |
| |
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 <dsahern@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@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
| |