Per Arena Page Table Data for OS/2 Warp V4.0 and OS/2 Warp V3.0

For PGDATA formats for other versions of OS/2 see:

PGDATA for OS/2 Warp 3.0 SMP

Pointers

For private arenas, ptda_ppgdata.

System Arena.

For private data, a PGDATA structure is imbedded in each process' PTDA at (ptda_pgdata +0x80).

For the Global Shared Region the PGDATA structure is located at public symbol _pgShrData.

For the System Arena the PGDATA structure is located at public symbol _pgData.

The tables of PTE counts pointed to by pd_pcalloc, pd_pcpresent and pd_pcresident are located as follows:

System arena:

pd_pcalloc
Located at public symbol _pgcPteAllocated
pd_pcpresent
Located at public symbol _pgcPtePresent
pd_pcresident
Located at public symbol _pgcPteResident
Global System Region:
pd_pcalloc
Located at public symbol _pgcShrPteAllocated
pd_pcpresent
Located at public symbol _pgcShrPtePresent
pd_pcresident
Located at public symbol _pgcShrPteResident
Private Data:
All three tables are imbedded contiguously within the PTDA at ptda_pgc.
Note: The tables pointed to by pd_ppde, pd_ppte, pd_pcalloc, pd_pcpresent and pd_pcresident are indexed relative to the base virtual page number (pd_base) of the region.
VM Owners.
ptda (0xffcb) os2krnl (0xffaa)

Format

PGDATA Per Arena Page Table Data.

┌────────────────┬────┬────────┬────┬────────────────────────────────────────┐│Field Name      │Off │Length  │Type│Description                             │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_ppte         │+0  │4       │D   │pointer to ptes                         │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_ppde         │+4  │4       │D   │pointer to pdes                         │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_pcalloc      │+8  │4       │D   │pointer to (word) counts of allocated   │
│                │    │        │    │ptes per pde                            │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_pcpresent    │+c  │4       │D   │pointer to (word) counts of present ptes│
│                │    │        │    │per pde                                 │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_pcresident   │+10 │4       │D   │pointer to (word) counts of             │
│                │    │        │    │locked/resident ptes                    │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_base         │+14 │4       │D   │base virtual page number                │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_pvdmalias    │+18 │4       │D   │base of vdm alias region                │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_maxpde       │+1c │2       │W   │max potential pdes for this arena       │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_cpdelow      │+1e │2       │W   │count of low in-use pdes                │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_cpdehigh     │+20 │2       │W   │count of high in-use pdes               │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_ptcontext    │+22 │2       │W   │page table context                      │
├────────────────┼────┼────────┼────┼────────────────────────────────────────┤
│pd_flags        │+24 │2       │W   │per-process page manager flags          │
└────────────────┴────┴────────┴────┴────────────────────────────────────────┘

pd_flags flag definitions:

┌──────────────┬────────┬──────────────────────────────┐
│Name          │Bit Mask│Description                   │
├──────────────┼────────┼──────────────────────────────┤
│PD_AGINGNEEDED│1       │process not aged in this sweep│
├──────────────┼────────┼──────────────────────────────┤
│PD_FREE       │2       │                              │
└──────────────┴────────┴──────────────────────────────┘

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