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    Subject[PATCH 5.12 123/178] tracing: Do not stop recording cmdlines when tracing is off
    Date
    From: Steven Rostedt (VMware) <rostedt@goodmis.org>

    commit 85550c83da421fb12dc1816c45012e1e638d2b38 upstream.

    The saved_cmdlines is used to map pids to the task name, such that the
    output of the tracing does not just show pids, but also gives a human
    readable name for the task.

    If the name is not mapped, the output looks like this:

    <...>-1316 [005] ...2 132.044039: ...

    Instead of this:

    gnome-shell-1316 [005] ...2 132.044039: ...

    The names are updated when tracing is running, but are skipped if tracing
    is stopped. Unfortunately, this stops the recording of the names if the
    top level tracer is stopped, and not if there's other tracers active.

    The recording of a name only happens when a new event is written into a
    ring buffer, so there is no need to test if tracing is on or not. If
    tracing is off, then no event is written and no need to test if tracing is
    off or not.

    Remove the check, as it hides the names of tasks for events in the
    instance buffers.

    Cc: stable@vger.kernel.org
    Fixes: 7ffbd48d5cab2 ("tracing: Cache comms only after an event occurred")
    Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    kernel/trace/trace.c | 2 --
    1 file changed, 2 deletions(-)

    --- a/kernel/trace/trace.c
    +++ b/kernel/trace/trace.c
    @@ -2486,8 +2486,6 @@ static bool tracing_record_taskinfo_skip
    {
    if (unlikely(!(flags & (TRACE_RECORD_CMDLINE | TRACE_RECORD_TGID))))
    return true;
    - if (atomic_read(&trace_record_taskinfo_disabled) || !tracing_is_on())
    - return true;
    if (!__this_cpu_read(trace_taskinfo_save))
    return true;
    return false;

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