.MP - Format Memory Page Frame Structures (PFs)

Display memory Page Frame Structures (PFs).

Syntax:

                     ┌─────────┐
                              │
────.MP ──┬───────┬─┬───────┬┴┬────────────────────────────┬────
            └── B ──┘ ├── F ──┤ └─┬── frame ──┬─┬─────────┬──┘
                      ├── I ──┤   └── laddr ──┘ └── Ln ───┘
                      ├── L ──┤
                      └── R ──┘

Parameters:

B

Display in-use (busy) Page Frame Structures in sequential order.

Note: In-Use PFs are signified by the PF_FREE flag being reset and not by the PF_BUSY flag being set.

F
Display free Page Frame Structures.
I
Display idle Page Frame Structures. (This option was introduced at fix pack 29 of Warp V3 and base Warp V4.)
L
Follow left (forward) chain pointer. This is only of relevance to Free and Idle Page Frame Structures since these are linked in a double linked chain.

Warning: Both the Dump Formatter and the Kernel Debugger may fail to recognise the chain pointers correctly. In particular the 2 high order digits of the frame number are truncated. Use this option advisedly! This is fixed from fix pack 29 for Warp V3 and base Warp V4. See Free Page Frame Structures or Idle Page Frame Structures for information on locating Idle and Free PF chains.


R
Follow right (backward) chain pointer. This is only of relevance to Free and Idle Page Frame Structures since these are linked in a double linked chain.

Warning: Both the Dump Formatter and the Kernel Debugger may fail to recognise the chain pointers correctly. In particular the 2 high order digits of the frame number are truncated. Use this option advisedly! This is fixed from fix pack 29 for Warp V3 and base Warp V4. See Free Page Frame Structures or Idle Page Frame Structures for information on locating idle and free PF chains.


laddr
Specifies the linear address of a specific Page Frame Structure to be formatted.

An address expression may be specified.

Ln
Specifies the number of Page Frame Structures to display from the starting criterion.
frame
Specifies a physical storage page frame number. This will cause the Page Frame Structure corresponding to that frame to be displayed except for UVIRT storage. PFs corresponding to UVIRT storage are zeroed unless aliased by non-UVIRT storage. In the former case .MP will display then next non-UVIRT PF. In the latter it will display the aliasing non-UVIRT PF. See DP command for related information.

Results & Notes:

Page Frame Structures are allocated in contiguous storage from the address given by global variable:

 _pft

Output from the .MP. command appears in one of three formats.

In-use Page Frame Structure
Idle Page Frame Structure.
Free Page Frame Structure.

For a description of the fields formatted by .MP select .MP Output Field Descriptions

For more examples using of the .M family of commands see: Exploring Memory Management.

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