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Drivers: hv: vmbus: Expose per-channel interrupts and events counters

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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>
This commit is contained in:
Stephen Hemminger 2017-10-29 11:33:40 -07:00 committed by Greg Kroah-Hartman
parent 6fbf248a20
commit 6981fbf378
4 changed files with 42 additions and 6 deletions
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26
Documentation/ABI/stable/sysfs-bus-vmbus
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@ -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

2
drivers/hv/connection.c
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@ -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);

16
drivers/hv/vmbus_drv.c
View File

@ -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
};

4
include/linux/hyperv.h
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@ -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);