Commit 5cd95c2d authored Jul 20, 2012 by David Ahern Committed by Arnaldo Carvalho de Melo Jul 25, 2012

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>

parent f51304d3

tools/perf/util/map.c

+16 −1

Original line number	Diff line number	Diff line
		@@ -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)

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