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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>
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@ -7,6 +7,7 @@
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#include <stdio.h>
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#include <unistd.h>
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#include "map.h"
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#include "thread.h"
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const char *map_type__name[MAP__NR_TYPES] = {
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[MAP__FUNCTION] = "Functions",
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@ -585,7 +586,21 @@ int machine__init(struct machine *self, const char *root_dir, pid_t pid)
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self->kmaps.machine = self;
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self->pid = pid;
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self->root_dir = strdup(root_dir);
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return self->root_dir == NULL ? -ENOMEM : 0;
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if (self->root_dir == NULL)
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return -ENOMEM;
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if (pid != HOST_KERNEL_ID) {
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struct thread *thread = machine__findnew_thread(self, pid);
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char comm[64];
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if (thread == NULL)
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return -ENOMEM;
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snprintf(comm, sizeof(comm), "[guest/%d]", pid);
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thread__set_comm(thread, comm);
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}
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return 0;
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}
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static void dsos__delete(struct list_head *self)
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