Drivers: hv: vmbus: Expose per-channel interrupts and events counters
When investigating performance, it is useful to be able to look at the number of host and guest events per-channel. This is equivalent to per-device interrupt statistics. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -61,39 +61,53 @@ Date: September. 2017
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KernelVersion: 4.14
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Contact: Stephen Hemminger <sthemmin@microsoft.com>
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Description: Inbound channel signaling state
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Users: Debuggig tools
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Users: Debugging tools
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What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/latency
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Date: September. 2017
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KernelVersion: 4.14
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Contact: Stephen Hemminger <sthemmin@microsoft.com>
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Description: Channel signaling latency
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Users: Debuggig tools
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Users: Debugging tools
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What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/out_mask
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Date: September. 2017
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KernelVersion: 4.14
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Contact: Stephen Hemminger <sthemmin@microsoft.com>
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Description: Outbound channel signaling state
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Users: Debuggig tools
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Users: Debugging tools
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What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/pending
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Date: September. 2017
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KernelVersion: 4.14
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Contact: Stephen Hemminger <sthemmin@microsoft.com>
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Description: Channel interrupt pending state
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Users: Debuggig tools
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Users: Debugging tools
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What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/read_avail
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Date: September. 2017
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KernelVersion: 4.14
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Contact: Stephen Hemminger <sthemmin@microsoft.com>
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Description: Bytes availabble to read
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Users: Debuggig tools
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Users: Debugging tools
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What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/write_avail
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Date: September. 2017
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KernelVersion: 4.14
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Contact: Stephen Hemminger <sthemmin@microsoft.com>
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Description: Bytes availabble to write
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Users: Debuggig tools
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Users: Debugging tools
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What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/events
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Date: September. 2017
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KernelVersion: 4.14
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Contact: Stephen Hemminger <sthemmin@microsoft.com>
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Description: Number of times we have signaled the host
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Users: Debugging tools
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What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/interrupts
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Date: September. 2017
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KernelVersion: 4.14
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Contact: Stephen Hemminger <sthemmin@microsoft.com>
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Description: Number of times we have taken an interrupt (incoming)
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Users: Debugging tools
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@ -409,6 +409,8 @@ void vmbus_set_event(struct vmbus_channel *channel)
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if (!channel->is_dedicated_interrupt)
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vmbus_send_interrupt(child_relid);
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++channel->sig_events;
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hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event);
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}
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EXPORT_SYMBOL_GPL(vmbus_set_event);
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@ -944,6 +944,8 @@ static void vmbus_chan_sched(struct hv_per_cpu_context *hv_cpu)
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if (channel->rescind)
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continue;
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++channel->interrupts;
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switch (channel->callback_mode) {
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case HV_CALL_ISR:
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vmbus_channel_isr(channel);
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@ -1237,6 +1239,18 @@ static ssize_t channel_latency_show(const struct vmbus_channel *channel,
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}
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VMBUS_CHAN_ATTR(latency, S_IRUGO, channel_latency_show, NULL);
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static ssize_t channel_interrupts_show(const struct vmbus_channel *channel, char *buf)
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{
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return sprintf(buf, "%llu\n", channel->interrupts);
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}
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VMBUS_CHAN_ATTR(interrupts, S_IRUGO, channel_interrupts_show, NULL);
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static ssize_t channel_events_show(const struct vmbus_channel *channel, char *buf)
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{
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return sprintf(buf, "%llu\n", channel->sig_events);
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}
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VMBUS_CHAN_ATTR(events, S_IRUGO, channel_events_show, NULL);
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static struct attribute *vmbus_chan_attrs[] = {
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&chan_attr_out_mask.attr,
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&chan_attr_in_mask.attr,
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@ -1245,6 +1259,8 @@ static struct attribute *vmbus_chan_attrs[] = {
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&chan_attr_cpu.attr,
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&chan_attr_pending.attr,
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&chan_attr_latency.attr,
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&chan_attr_interrupts.attr,
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&chan_attr_events.attr,
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NULL
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};
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@ -719,6 +719,10 @@ struct vmbus_channel {
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struct vmbus_close_msg close_msg;
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/* Statistics */
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u64 interrupts; /* Host to Guest interrupts */
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u64 sig_events; /* Guest to Host events */
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/* Channel callback's invoked in softirq context */
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struct tasklet_struct callback_event;
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void (*onchannel_callback)(void *context);
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