On Fri, Jul 20, 2012 at 05:25:47PM -0600, David Ahern wrote:
> 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 <jo...@redhat.com>
>
> Signed-off-by: David Ahern <dsah...@gmail.com>
> Cc: Arnaldo Carvalho de Melo <a...@ghostprotocols.net>
> Cc: Ingo Molnar <mi...@kernel.org>
> Cc: Jiri Olsa <jo...@redhat.com>
> Cc: Namhyung Kim <namhy...@kernel.org>
> 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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