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Currently numcpus is determined in pid_put_sample which is only called on sched_switch/sched_wakeup sample processing. On a machine with a lot cpus I often saw the last cpu missing. Check for (max) numcpus on every event happening and in the beginning. -> fixes the issue for me. Signed-off-by: Thomas Renninger <[email protected]> Cc: Arjan van de Ven <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: [email protected] LKML-Reference: <[email protected]> Signed-off-by: Ingo Molnar <[email protected]>