On Thu, Oct 05, 2017 at 05:35:04PM -0700, k...@exchange.microsoft.com wrote:
> From: Stephen Hemminger <step...@networkplumber.org>
>
> 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 <sthem...@microsoft.com>
> Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
> ---
> Documentation/ABI/stable/sysfs-bus-vmbus | 14 ++++++++++++++
> drivers/hv/connection.c | 2 ++
> drivers/hv/vmbus_drv.c | 18 ++++++++++++++++++
> include/linux/hyperv.h | 4 ++++
> 4 files changed, 38 insertions(+)
>
> diff --git a/Documentation/ABI/stable/sysfs-bus-vmbus
> b/Documentation/ABI/stable/sysfs-bus-vmbus
> index 0ebd8a1537a0..d4eca1717adb 100644
> --- a/Documentation/ABI/stable/sysfs-bus-vmbus
> +++ b/Documentation/ABI/stable/sysfs-bus-vmbus
> @@ -97,3 +97,17 @@ KernelVersion: 4.14
> Contact: Stephen Hemminger <sthem...@microsoft.com>
> Description: Bytes availabble to write
> Users: Debuggig tools
> +
> +What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/events
> +Date: September. 2017
> +KernelVersion: 4.14
> +Contact: Stephen Hemminger <sthem...@microsoft.com>
> +Description: Number of times we have signaled the host
> +Users: Debuggig tools
Odd spelling :)
> +
> +What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/interrupts
> +Date: September. 2017
> +KernelVersion: 4.14
> +Contact: Stephen Hemminger <sthem...@microsoft.com>
> +Description: Number of times we have taken an interrupt (incoming)
> +Users: Debuggig tools
Same odd spelling :(
> diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
> index f41901f80b64..b06a6b796819 100644
> --- a/drivers/hv/connection.c
> +++ b/drivers/hv/connection.c
> @@ -409,6 +409,8 @@ void vmbus_set_event(struct vmbus_channel *channel)
> if (!channel->is_dedicated_interrupt)
> vmbus_send_interrupt(child_relid);
>
> + ++channel->sig_events;
> +
> hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event);
> }
> EXPORT_SYMBOL_GPL(vmbus_set_event);
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index a209527b09f5..e8cd19095212 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -945,6 +945,8 @@ static void vmbus_chan_sched(struct hv_per_cpu_context
> *hv_cpu)
> if (channel->rescind)
> continue;
>
> + ++channel->interrupts;
> +
> switch (channel->callback_mode) {
> case HV_CALL_ISR:
> vmbus_channel_isr(channel);
> @@ -1238,6 +1240,20 @@ static ssize_t channel_latency_show(const struct
> vmbus_channel *channel,
> }
> VMBUS_CHAN_ATTR(latency, S_IRUGO, channel_latency_show, NULL);
>
> +static ssize_t channel_interrupts_show(const struct vmbus_channel *channel,
> char *buf)
> +{
> + return sprintf(buf, "%u\n", channel->interrupts);
> +}
> +VMBUS_CHAN_ATTR(interrupts, S_IRUGO, channel_interrupts_show, NULL);
> +
> +static ssize_t channel_events_show(const struct vmbus_channel *channel, char
> *buf)
> +{
> + return sprintf(buf, "%u\n", channel->sig_events);
> +}
> +VMBUS_CHAN_ATTR(events, S_IRUGO, channel_events_show, NULL);
> +
> +
> +
Why so many blank lines?
> static struct attribute *vmbus_chan_attrs[] = {
> &chan_attr_out_mask.attr,
> &chan_attr_in_mask.attr,
> @@ -1246,6 +1262,8 @@ static struct attribute *vmbus_chan_attrs[] = {
> &chan_attr_cpu.attr,
> &chan_attr_pending.attr,
> &chan_attr_latency.attr,
> + &chan_attr_interrupts.attr,
> + &chan_attr_events.attr,
> NULL
> };
>
> diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
> index ef16ee039850..1b7e15d22f58 100644
> --- a/include/linux/hyperv.h
> +++ b/include/linux/hyperv.h
> @@ -719,6 +719,10 @@ struct vmbus_channel {
>
> struct vmbus_close_msg close_msg;
>
> + /* Statistics */
> + unsigned int interrupts; /* Host to Guest interrupts */
> + unsigned int sig_events; /* Guest to Host events */
u32 or u64 here? How is userspace going to handle these overflowing?
thanks,
greg k-h
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