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perf tools: Warn while running perf trace without sample
When a user runs perf trace using an input with logged counters without PERF_SAMPLE_RAW attribute, warn by giving a nice tip. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1250543271-8383-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -184,6 +184,10 @@ static int __cmd_trace(void)
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header = perf_header__read(input);
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sample_type = perf_header__sample_type(header);
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if (!(sample_type & PERF_SAMPLE_RAW))
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die("No trace sample to read. Did you call perf record "
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"without -R?");
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if (load_kernel() < 0) {
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perror("failed to load kernel symbols");
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return EXIT_FAILURE;
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