From: Kimberly Brown <[email protected]> Sent: Sunday, February 3, 2019 11:13 PM > > Counter values for per-channel interrupts and ring buffer full > conditions are useful for investigating performance. > > Expose counters in sysfs for 2 types of guest to host interrupts: > 1) Interrupts caused by the channel's outbound ring buffer transitioning > from empty to not empty > 2) Interrupts caused by the channel's inbound ring buffer transitioning > from full to not full while a packet is waiting for enough buffer space to > become available > > Expose 2 counters in sysfs for the number of times that write operations > encountered a full outbound ring buffer: > 1) The total number of write operations that encountered a full > condition > 2) The number of write operations that were the first to encounter a > full condition > > Increment the outbound full condition counters in the > hv_ringbuffer_write() function because, for most drivers, a full > outbound ring buffer is detected in that function. Also increment the > outbound full condition counters in the set_channel_pending_send_size() > function. In the hv_sock driver, a full outbound ring buffer is detected > and set_channel_pending_send_size() is called before > hv_ringbuffer_write() is called. > > I tested this patch by confirming that the sysfs files were created and > observing the counter values. The values seemed to increase by a > reasonable amount when the Hyper-v related drivers were in use. > > Signed-off-by: Kimberly Brown <[email protected]> > --- > Reviewed-by: Michael Kelley <[email protected]>
