> + /* > + * There are cases where, even though, the PEBS ovfl bit is set > in > + * GLOBAL_OVF_STATUS, the PEBS events may also have their > overflow bits > + * set for their counters. We must clear them here because they > have > + * been processed as exact samples in the drain_pebs() routine. > They > + * must not be processed again in the for_each_bit_set() loop > for > + * regular samples below. > + */ > + status &= ~cpuc->pebs_enabled; > + status &= x86_pmu.intel_ctrl | GLOBAL_STATUS_TRACE_TOPAPMI;
If you just clear the bits here they will not be acked and stay around forever in GLOBAL_STATUS, which causes other problems. You need a separate ack_status variable that contains all bits and is always acked. -Andi -- [email protected] -- Speaking for myself only
