PAGEFIX parameter
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Page-fix parameter string
Summary
- Default value
- X'00000000'
- Parameter type
- System
- Where set
- On User 0's parameter line
- Related products
- All
- Introduced
- Model 204 V2.1 or earlier
Description
PAGEFIX specifies the page fixing feature, indicative of which areas are to be fixed in storage.
PAGEFIX is not used under z/VM; it is used only under z/OS and z/VSE.
Valid settings of PAGEFIX are (options can be summed):
| Setting | Fixes... |
|---|---|
| X'04000000' | main C PDL (version 7.6 and higher) |
| X'02000000' | RESPAGE area. (version 7.6 and higher) |
| X'01000000' | Server non-swappable (NSA) area. (version 7.6 and higher) |
| X'00800000' | Open page buffers. (version 7.6 and higher) |
| X'00400000' | APSYPAGE area. (version 7.6 and higher) |
| X'00200000' | Checkpoint asynchronous buffers. (version 7.5 and higher) |
| X'00100000' | DBIDs. (version 7.6 and higher) |
| X'00080000' | Monitor real subtask work area. |
| X'00040000' | Record descriptions. |
| X'00020000' | Server areas. |
| X'00010000' | Record enqueuing table. |
| X'00008000' | Resource enqueuing table. |
| X'00004000' | User/file mode table. |
| X'00002000' | File save areas. |
| X'00001000' | DCB areas (DTF areas in VSE). |
| X'00000800' | LPM and DSL for CCATEMP. |
| X'00000400' | LPM and DSL for user files. |
| X'00000200' | Physical extent blocks for CCATEMP. |
| X'00000100' | Physical extent blocks for user files. |
| X'00000080' | Journal control blocks and buffers. |
| X'00000040' | Buffers. |
| X'00000020' | Buffer control blocks. |
| X'00000010' | Buffer hash field. |
| X'00000008' | STAT areas. |
| X'00000004' | SVIO work areas and Server swap pages. |
| X'00000002' | CWAIT work areas. |
| X'00000001' | KOMM. |
Timer PC requires KOMM to be pagefixed
Since the Timer PC disables interrupts but still needs to reference KOMM, the following error message informs you to pagefix KOMM. This prevents possible 0C4 and X'11' return codes (commonly known as Page Translation Exceptions):
M204.2447: KOMM MUST BE PAGE FIXED TO USE PCTIMER