On Fri, Feb 14, 2014 at 04:44:08PM -0800, Andi Kleen wrote: > > Make intel_pmu_handle_irq() take the full exit path when returning early.
This reminds me of the late-ack stuff; The way I understand interrupts to work is that when you raise the interrupt it gets latched, when you ACK you drop the latch. Then when it gets re-raised while its still in progress, it gets latched again and the irq-enable at the end of the running handler will get it to trigger again. So by late-ACK-ing the PMI we can miss PMIs that happen between enabling the PMU and ACKing the PMI. We should either re-check the overflow mask after the ACK or do the ACK while the PMU is disabled. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
