1STRUCT CMBDATA(9)                 The ccw bus                STRUCT CMBDATA(9)
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NAME

6       struct_cmbdata - channel measurement block data for user space
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SYNOPSIS

9       struct cmbdata {
10         __u64 size;
11         __u64 elapsed_time;
12         __u64 ssch_rsch_count;
13         __u64 sample_count;
14         __u64 device_connect_time;
15         __u64 function_pending_time;
16         __u64 device_disconnect_time;
17         __u64 control_unit_queuing_time;
18         __u64 device_active_only_time;
19         __u64 device_busy_time;
20         __u64 initial_command_response_time;
21       };
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MEMBERS

24       size
25           size of the stored data
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27       elapsed_time
28           time since last sampling
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30       ssch_rsch_count
31           number of ssch and rsch
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33       sample_count
34           number of samples
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36       device_connect_time
37           time of device connect
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39       function_pending_time
40           time of function pending
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42       device_disconnect_time
43           time of device disconnect
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45       control_unit_queuing_time
46           time of control unit queuing
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48       device_active_only_time
49           time of device active only
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51       device_busy_time
52           time of device busy (ext. format)
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54       initial_command_response_time
55           initial command response time (ext. format)
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DESCRIPTION

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

67       Cornelia Huck <cornelia.huck@de.ibm.com>
68           Author.
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71Kernel Hackers Manual 2.6.         June 2019                 STRUCT CMBDATA(9)
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