perf record: Properly synchronize child creation
Remove that ugly usleep and provide proper serialization between parent and child just like perf-stat does. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: fweisbec@gmail.com Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <20091216165904.908184135@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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