From 5cd95c2db479aa7a66f6fa572dfa410c6314c78e Mon Sep 17 00:00:00 2001 From: David Ahern Date: Fri, 20 Jul 2012 17:25:47 -0600 Subject: [PATCH] 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 Signed-off-by: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1342826756-64663-3-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- 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 a1f4e366914..8668569d4b2 100644 --- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -7,6 +7,7 @@ #include #include #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)