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96039c7c52
The is_idle_sample() function actually does more than determining whether sample come from idle task. Split the callchain part into save_task_callchain() to make it clearer. Also checking prev_pid from trace data looks preferred than just checking sample->pid since it's possible, although rare, to have invalid 0 pid/tid on scheduling an exiting task. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: David Ahern <dsahern@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20161208144755.16673-2-namhyung@kernel.org [ Remove some needless () in some return statements ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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