Arnaldo Carvalho de Melo 084ab9f862 perf stat: Better report failure to collect system wide stats ... Before: [acme@doppio linux-2.6-tip]$ perf stat -a sleep 1s Performance counter stats for 'sleep 1s': <not counted> task-clock-msecs <not counted> context-switches <not counted> CPU-migrations <not counted> page-faults <not counted> cycles <not counted> instructions <not counted> branches <not counted> branch-misses <not counted> cache-references <not counted> cache-misses 1.016998463 seconds time elapsed [acme@doppio linux-2.6-tip]$ Now: [acme@doppio linux-2.6-tip]$ perf stat -a sleep 1s No permission to collect system-wide stats. Consider tweaking /proc/sys/kernel/perf_event_paranoid. [acme@doppio linux-2.6-tip]$ Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1269274229-20442-4-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2010-03-22 18:47:35 +01:00
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perf	perf stat: Better report failure to collect system wide stats	2010-03-22 18:47:35 +01:00