Commit 6981fbf3 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Greg Kroah-Hartman
Browse files

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: default avatarStephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6fbf248a

Documentation/ABI/stable/sysfs-bus-vmbus

+20 −6
Original line number Diff line number Diff line
@@ -61,39 +61,53 @@ Date: September. 2017 
KernelVersion:	4.14

Contact:	Stephen Hemminger <sthemmin@microsoft.com>

Description:	Inbound channel signaling state

Users:		Debuggig tools

Users:		Debugging tools



What:		/sys/bus/vmbus/devices/vmbus_*/channels/relid/latency

Date:		September. 2017

KernelVersion:	4.14

Contact:	Stephen Hemminger <sthemmin@microsoft.com>

Description:	Channel signaling latency

Users:		Debuggig tools

Users:		Debugging tools



What:		/sys/bus/vmbus/devices/vmbus_*/channels/relid/out_mask

Date:		September. 2017

KernelVersion:	4.14

Contact:	Stephen Hemminger <sthemmin@microsoft.com>

Description:	Outbound channel signaling state

Users:		Debuggig tools

Users:		Debugging tools



What:		/sys/bus/vmbus/devices/vmbus_*/channels/relid/pending

Date:		September. 2017

KernelVersion:	4.14

Contact:	Stephen Hemminger <sthemmin@microsoft.com>

Description:	Channel interrupt pending state

Users:		Debuggig tools

Users:		Debugging tools



What:		/sys/bus/vmbus/devices/vmbus_*/channels/relid/read_avail

Date:		September. 2017

KernelVersion:	4.14

Contact:	Stephen Hemminger <sthemmin@microsoft.com>

Description:	Bytes availabble to read

Users:		Debuggig tools

Users:		Debugging tools



What:		/sys/bus/vmbus/devices/vmbus_*/channels/relid/write_avail

Date:		September. 2017

KernelVersion:	4.14

Contact:	Stephen Hemminger <sthemmin@microsoft.com>

Description:	Bytes availabble to write

Users:		Debuggig tools
 
Users:		Debugging tools



What:		/sys/bus/vmbus/devices/vmbus_*/channels/relid/events

Date:		September. 2017

KernelVersion:	4.14

Contact:	Stephen Hemminger <sthemmin@microsoft.com>

Description:	Number of times we have signaled the host

Users:		Debugging tools



What:		/sys/bus/vmbus/devices/vmbus_*/channels/relid/interrupts

Date:		September. 2017

KernelVersion:	4.14

Contact:	Stephen Hemminger <sthemmin@microsoft.com>

Description:	Number of times we have taken an interrupt (incoming)

Users:		Debugging tools

drivers/hv/connection.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

drivers/hv/vmbus_drv.c

+16 −0
Original line number Diff line number Diff line
@@ -944,6 +944,8 @@ 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);
@@ -1237,6 +1239,18 @@ 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, "%llu\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, "%llu\n", channel->sig_events);

}

VMBUS_CHAN_ATTR(events, S_IRUGO, channel_events_show, NULL);



static struct attribute *vmbus_chan_attrs[] = {

	&chan_attr_out_mask.attr,

	&chan_attr_in_mask.attr,
@@ -1245,6 +1259,8 @@ 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

};

include/linux/hyperv.h

+4 −0
Original line number Diff line number Diff line
@@ -719,6 +719,10 @@ struct vmbus_channel { 


	struct vmbus_close_msg close_msg;



	/* Statistics */

	u64	interrupts;	/* Host to Guest interrupts */

	u64	sig_events;	/* Guest to Host events */



	/* Channel callback's invoked in softirq context */

	struct tasklet_struct callback_event;

	void (*onchannel_callback)(void *context);