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    Subject[tip:perf/core] perf tools: Do not synthesize the treads of default guest.
    Commit-ID:  c239c25a82808ad2cbc795b69e621c4c24f154d6
    Gitweb: http://git.kernel.org/tip/c239c25a82808ad2cbc795b69e621c4c24f154d6
    Author: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
    AuthorDate: Fri, 20 Dec 2013 15:53:00 -0500
    Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
    CommitDate: Mon, 23 Dec 2013 16:49:51 -0300

    perf tools: Do not synthesize the treads of default guest.

    As the default guest is designed to handle orphan kernel symboles with
    --guestkallsysms and --guestmodules, it has no user space.

    So we should skip synthesizing threads if machine is default guest.

    Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Namhyung Kim <namhyung.kim@lge.com>
    Link: http://lkml.kernel.org/r/e9ddb5dac6f963169657218b12ceb3c2030f54e8.1387572416.git.yangds.fnst@cn.fujitsu.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/util/event.c | 9 +++++++++
    1 file changed, 9 insertions(+)

    diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
    index 2905771..45a76c6 100644
    --- a/tools/perf/util/event.c
    +++ b/tools/perf/util/event.c
    @@ -133,6 +133,9 @@ static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
    goto out;
    }

    + if (machine__is_default_guest(machine))
    + return 0;
    +
    snprintf(filename, sizeof(filename), "%s/proc/%d/task",
    machine->root_dir, pid);

    @@ -183,6 +186,9 @@ static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
    FILE *fp;
    int rc = 0;

    + if (machine__is_default_guest(machine))
    + return 0;
    +
    snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
    machine->root_dir, pid);

    @@ -409,6 +415,9 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
    if (mmap_event == NULL)
    goto out_free_comm;

    + if (machine__is_default_guest(machine))
    + return 0;
    +
    snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
    proc = opendir(proc_path);


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