Programming Interface Information:
The Monitor Records are intended Programming Interfaces that
allow the customer to write programs to obtain services of z/VM.

MRIODTON

Prolog
Control Block Contents
Storage Layout
Cross Reference

MRIODTON Prolog

 DSECT NAME - IODTON
 FUNCTION - Map a Monitor record.
 LOCATED BY -
      Through the Monitor Control Area
 REFERENCED CONTROL BLOCKS -
      MRRECHDR    Monitor Record Header
 NAME - MRIODTON
 DESCRIPTIVE NAME - Monitor Event Record
                  Domain  6 - I/O Domain
                  Record 18 - Set Throttle Rate
 DESCRIPTION - Indicates that a throttle rate has been set
             for a device.


MRIODTON Control Block Contents

Offsets
Dec Hex  Type       Len  Name (Dim)         Description
 
  0   0  Structure   40  IODTON              Start of monitor record
  0   0  Character    0  IODTON_MRHDR        Record header. See MRRECHDR for
                                             details.
  0   0  Character   20  MRHDR               
  0   0  Unsigned     2  MRHDRLEN            record length in bytes
  2   2  Unsigned     2  MRHDRZER            field of zeros
  4   4  Unsigned     1  MRHDRDM             domain identifier
  5   5  Unsigned     1  *                   
  6   6  Unsigned     2  MRHDRRC             record identifier
  8   8  Character    8  MRHDRTOD            Time at which this record was
                                             built. In time-of-day (TOD) clock
                                             format. See IBM System 370 XA
                                             Principle of Operation for
                                             explanation of format.
 16  10  Character    4  *                   
 20  14  Character    0  MRHDR_END           End of header
 20  14  Unsigned     4  IODTON_RDEVSID      Host subchannel I.D. number
                                             defined at initialization
 24  18  Unsigned     2  IODTON_RDEVDEV      Device number
 26  1A  Unsigned     2  *                   Reserved and available for IBM
                                             use
 28  1C  Unsigned     4  IODTON_THRDLYS      Cummulative count of I/O
                                             requests that were delayed. This
                                             count may be non-zero if we are
                                             changing the rate of a device that
                                             is already in the throttle set.
 32  20  Character    8  IODTON_THRIORTE     I/O rate expressed as the TOD
                                             clock increment between I/O
                                             operations.
 40  28  Character    0  IODTON_END          

MRIODTON Cross Reference

                      Hex           Hex
Name                 Offset Length Value
 
IODTON                  0     40
IODTON_END             28      0
IODTON_MRHDR            0      0
IODTON_RDEVDEV         18      2
IODTON_RDEVSID         14      4
IODTON_THRDLYS         1C      4
IODTON_THRIORTE        20      8
MRHDR                   0     20
MRHDR_END              14      0
MRHDRDM                 4      1
MRHDRLEN                0      2
MRHDRRC                 6      2
MRHDRTOD                8      8
MRHDRZER                2      2

This information is based on z/VM V4R2.0.
Last updated on 15 Oct 2001 at 08:04:23.
Copyright IBM Corporation, 1990, 2001