diff options
| author | Dexuan Cui <decui@microsoft.com> | 2015-08-05 10:52:43 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-05 21:44:29 +0300 |
| commit | 042ab0313bbb7e776e9510da3f07fb300d08a8ba (patch) | |
| tree | 8411c0ed72dbcb259277a7b1d5eb718e83ed52a8 /drivers/hv/vmbus_drv.c | |
| parent | ca9357bd26c2f8e7b909321eedd651f52cc30d04 (diff) | |
| download | linux-042ab0313bbb7e776e9510da3f07fb300d08a8ba.tar.xz | |
Drivers: hv: vmbus: add a sysfs attr to show the binding of channel/VP
This is useful to analyze performance issue.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/vmbus_drv.c')
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 8c3eaee8c54c..45d6d7a0ed89 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -441,6 +441,43 @@ static ssize_t in_write_bytes_avail_show(struct device *dev, } static DEVICE_ATTR_RO(in_write_bytes_avail); +static ssize_t channel_vp_mapping_show(struct device *dev, + struct device_attribute *dev_attr, + char *buf) +{ + struct hv_device *hv_dev = device_to_hv_device(dev); + struct vmbus_channel *channel = hv_dev->channel, *cur_sc; + unsigned long flags; + int buf_size = PAGE_SIZE, n_written, tot_written; + struct list_head *cur; + + if (!channel) + return -ENODEV; + + tot_written = snprintf(buf, buf_size, "%u:%u\n", + channel->offermsg.child_relid, channel->target_cpu); + + spin_lock_irqsave(&channel->lock, flags); + + list_for_each(cur, &channel->sc_list) { + if (tot_written >= buf_size - 1) + break; + + cur_sc = list_entry(cur, struct vmbus_channel, sc_list); + n_written = scnprintf(buf + tot_written, + buf_size - tot_written, + "%u:%u\n", + cur_sc->offermsg.child_relid, + cur_sc->target_cpu); + tot_written += n_written; + } + + spin_unlock_irqrestore(&channel->lock, flags); + + return tot_written; +} +static DEVICE_ATTR_RO(channel_vp_mapping); + /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ static struct attribute *vmbus_attrs[] = { &dev_attr_id.attr, @@ -465,6 +502,7 @@ static struct attribute *vmbus_attrs[] = { &dev_attr_in_write_index.attr, &dev_attr_in_read_bytes_avail.attr, &dev_attr_in_write_bytes_avail.attr, + &dev_attr_channel_vp_mapping.attr, NULL, }; ATTRIBUTE_GROUPS(vmbus); |