6de6a7b957
Provide a way to reset an existing counter - this eases PAPI libraries around perfcounters. Similar to read() it doesn't collapse pending child counters. [ Impact: new perfcounter fd ioctl method to reset counters ] Suggested-by: Corey Ashford <cjashfor@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <20090505155437.022272933@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>