struct cmbdata(9)
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.