perf tools: Make 'trace' or 'trace_fields' sort key default for tracepoint events
When an evlist contains tracepoint events only, use 'trace' sort key as default. If --raw-trace option was given, use 'trace_fields' instead. This will make users more convenient to see trace result. Suggested-and-Acked-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1450804030-29193-14-git-send-email-namhyung@kernel.org [ Check evlist in get_default_sort_order() fixing a segfault in 'perf test hists' reported by Jiri Olsa ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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