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authorPeter Zijlstra <peterz@infradead.org>2010-01-29 03:04:26 -0500
committerIngo Molnar <mingo@elte.hu>2010-01-29 03:15:26 -0500
commit75c9f3284a7ff957829f44baace82406a6354ceb (patch)
tree8e8903b75bbecbee85f0a30743f049e39b08d15d /tools
parent18c01f8abff51e4910cc5ffb4b710e8c6eea60c9 (diff)
perf_events: Fix sample_period transfer on inherit
One problem with frequency driven counters is that we cannot predict the rate at which they trigger, therefore we have to start them at period=1, this causes a ramp up effect. However, if we fail to propagate the stable state on fork each new child will have to ramp up again. This can lead to significant artifacts in sample data. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: eranian@google.com Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1264752266.4283.2121.camel@laptop> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
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