---
name: "struct_cmbdata"
section: "9"
platform: "linux"
package: "linux-manual-3.2"
version: "3.2.78-1"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/struct_cmbdata"
---

# struct\_cmbdata(9)

channel measurement block data for user space

## NAME

struct\_cmbdata - channel measurement block data for user space

## SYNOPSIS

```
struct cmbdata {
  __u64 size;
  __u64 elapsed_time;
  __u64 ssch_rsch_count;
  __u64 sample_count;
  __u64 device_connect_time;
  __u64 function_pending_time;
  __u64 device_disconnect_time;
  __u64 control_unit_queuing_time;
  __u64 device_active_only_time;
  __u64 device_busy_time;
  __u64 initial_command_response_time;
};
```

## MEMBERS

size

size of the stored data

elapsed\_time

time since last sampling

ssch\_rsch\_count

number of ssch and rsch

sample\_count

number of samples

device\_connect\_time

time of device connect

function\_pending\_time

time of function pending

device\_disconnect\_time

time of device disconnect

control\_unit\_queuing\_time

time of control unit queuing

device\_active\_only\_time

time of device active only

device\_busy\_time

time of device busy (ext. format)

initial\_command\_response\_time

initial command response time (ext. format)

## DESCRIPTION

All values are stored as 64 bit for simplicity, especially in 32 bit emulation mode. All time values are normalized to nanoseconds. Currently, two formats are known, which differ by the size of this structure, i.e. the last two members are only set when the extended channel measurement facility (first shipped in z990 machines) is activated. Potentially, more fields could be added, which would result in a new ioctl number.

## AUTHOR

**Cornelia Huck** \<cornelia.huck@de.ibm.com\>

Author.

## COPYRIGHT