OpenVMS VAX System Dump Analyzer Utility Manual

Updated: 11 December 1998

OpenVMS VAX System Dump Analyzer Utility Manual

Contents

Index

The SHOW LAN/FULL command in this example displays information for all LAN, LSB, and UCB data structures.

#6

SDA> SHOW LAN/TIMESTAMPS LAN Data Structures ------------------- -- LAN History Information 19-JUL-1993 14:27:38 -- 19-JUL 14:27:38.93 EZA Last receive 19-JUL 14:27:38.93 EZA Last fork scheduled 19-JUL 14:27:38.93 EZA Last fork time 19-JUL 14:27:36.05 EZA Last transmit 19-JUL 14:27:36.05 EZA1 DECNET Last transmit 19-JUL 14:23:54.41 EZA164 DIAG Last start completed 19-JUL 08:05:16.09 EZA Last excessive collision 19-JUL 06:40:22.94 EZA1 DECNET Last start completed 19-JUL 06:40:21.94 EZA Last DAT transmit

#6
SDA> SHOW LAN/TIMESTAMPS LAN Data Structures ------------------- -- LAN History Information 19-JUL-1993 14:27:38 -- 19-JUL 14:27:38.93 EZA Last receive 19-JUL 14:27:38.93 EZA Last fork scheduled 19-JUL 14:27:38.93 EZA Last fork time 19-JUL 14:27:36.05 EZA Last transmit 19-JUL 14:27:36.05 EZA1 DECNET Last transmit 19-JUL 14:23:54.41 EZA164 DIAG Last start completed 19-JUL 08:05:16.09 EZA Last excessive collision 19-JUL 06:40:22.94 EZA1 DECNET Last start completed 19-JUL 06:40:21.94 EZA Last DAT transmit

The SHOW LAN command displays LAN timestamp information.

SHOW LOCK

Displays information about all lock management locks in the system, cached locks, or a specified lock.

Format

SHOW LOCK {lock-id|/ALL|/CACHED|/NAME=resource-name}

Parameters

lock-id
Name of a specific lock. You cannot specify both a lock-id and a resource-name in the same command line.

Qualifiers

/ALL
Lists all locks that exist in the system. This is the default behavior of the SHOW LOCK command.
/CACHED
Shows only cached lock blocks (LKBs).
/NAME=resource-name
Displays information about the resource associated with the lock whose resource name begins with the specified resource-name. For case-sensitive names, enclose the resource-name in quotation marks. You cannot specify both a lock-id and resource-name in the same command line.

Description

The SHOW LOCK command displays the information described in Table SDA-15 for each lock management lock in the system or for the lock indicated by lock-id. (Use the SHOW SPINLOCK command to display information about spin locks.) You can obtain a similar display for the locks owned by a specific process by issuing the appropriate SHOW PROCESS/LOCKS command. See the OpenVMS System Services Reference Manual for additional discussion of the significance of this information.
You can display information about the resource to which a lock is queued by issuing the SHOW RESOURCE command and specifying the lock-id of the resource.

Table SDA-15 Contents of the SHOW LOCK and SHOW PROCESS/LOCKS Displays
Display Element Description

Process Index ¹ Index into the PCB array to a pointer to the process control block (PCB) of the process that owns the lock.

Name ¹ Name of the process that owns the lock.

Extended PID ¹ Clusterwide identification of the process that owns the lock.

Lock ID Identification of the lock.

PID Systemwide identification of the lock.

Flags Information specified in the request for the lock.

Par. ID Identification of the lock's parent lock.

Granted at Lock mode at which the lock was granted.

Sublocks Identification numbers of the locks that the lock owns.

LKB Address of the lock block (LKB). If a blocking AST has been enabled for this lock, the notation "BLKAST" appears next to the LKB address.

Resource Dump of the resource name. The two leftmost columns of the dump show its contents as hexadecimal values, the least significant byte being represented by the rightmost two digits. The rightmost column represents its contents as ASCII text, the least significant byte being represented by the leftmost character.

Status Status of the lock, information used internally by the lock manager.

Length Length of the resource name.

--- Processor access mode of the name space in which the resource block (RSB) associated with the lock resides.

--- Owner of the resource. Certain resources owned by the operating system list "System" as the owner. Resources owned by a group have the number (in octal) of the owning group in this field.

--- Indication of whether the lock is mastered on the local system or is a process copy.

**Table SDA-15 Contents of the SHOW LOCK and SHOW PROCESS/LOCKS Displays**
Display Element	Description
Process Index ¹	Index into the PCB array to a pointer to the process control block (PCB) of the process that owns the lock.
Name ¹	Name of the process that owns the lock.
Extended PID ¹	Clusterwide identification of the process that owns the lock.
Lock ID	Identification of the lock.
PID	Systemwide identification of the lock.
Flags	Information specified in the request for the lock.
Par. ID	Identification of the lock's parent lock.
Granted at	Lock mode at which the lock was granted.
Sublocks	Identification numbers of the locks that the lock owns.
LKB	Address of the lock block (LKB). If a blocking AST has been enabled for this lock, the notation "BLKAST" appears next to the LKB address.
Resource	Dump of the resource name. The two leftmost columns of the dump show its contents as hexadecimal values, the least significant byte being represented by the rightmost two digits. The rightmost column represents its contents as ASCII text, the least significant byte being represented by the leftmost character.
Status	Status of the lock, information used internally by the lock manager.
Length	Length of the resource name.
---	Processor access mode of the name space in which the resource block (RSB) associated with the lock resides.
---	Owner of the resource. Certain resources owned by the operating system list "System" as the owner. Resources owned by a group have the number (in octal) of the owning group in this field.
---	Indication of whether the lock is mastered on the local system or is a process copy.

¹You produce this display element only by using the SHOW PROCESS/LOCKS command.

Examples

#1
SDA> SHOW LOCK Lock database ------------- Lock id: 00010001 PID: 00000000 Flags: NOQUEUE SYNCSTS SYSTEM Par. id: 00000000 Granted at EX CVTSYS Sublocks: 1 LKB: 80D0B8A0 Resource: 5F535953 24535953 SYS$SYS_ Status: NOQUOTA Length 16 00000000 4C774449 IDwL.... Exec. mode 00000000 00000000 ........ System 00000000 00000000 ........ Local copy Lock id: 00010004 PID: 00000000 Flags: CONVERT SYNCSTS CVTSYS Par. id: 00000000 Granted at CR Sublocks: 16 LKB: 80D091A0 BLKAST Resource: 4D567624 42313146 F11B$vVM Status: NOQUOTA Length 18 20204E41 4A353153 S15JAN Kernel mode 00000000 00002020 ...... System 00000000 00000000 ........ Local copy Lock id: 00280009 PID: 00000000 Flags: VALBLK CONVERT SYNCSTS Par. id: 00000000 Granted at CR NOQUOTA CVTSYS Sublocks: 0 LKB: 80CDA880 Resource: 52414B5F 24535953 SYS$_KAR Status: MSTCPY Length 17 30415544 24455441 ATE$DUA0 Kernel mode 00000000 0000003A :....... System 00000000 00000000 ........ Master copy of lock 001C00F5 on system 000100A1 . . . SDA> SHOW RESOURCE/LOCK=280009 Resource database ----------------- Address of RSB: 80BD2150 Group grant mode: CR Parent RSB: 00000000 Conversion grant mode: CR Sub-RSB count: 0 BLKAST count: 0 Value block: 00000000 00000000 00000000 00000019 Seq. #: 0000002D Resource: 52414B5F 24535953 SYS$_KAR Length 17 30415544 24455441 ATE$DUA0 CSID: 00000000 Kernel mode 00000000 0000003A :....... System 00000000 00000000 ........ Granted queue (Lock ID / Gr mode): 00DA1269 CR 00280009 CR 0094054D CR 00270B9F CR 00D70BFE CR 000D0F4F CR 000D1017 CR 00601418 CR 01131450 CR 000F1964 CR 000200DF CR Conversion queue (Lock ID / Gr/Rq mode): * EMPTY QUEUE * Waiting queue (Lock ID / Rq mode): * EMPTY QUEUE *

SDA> SHOW LOCK
Lock database
-------------
  
Lock id:  00010001   PID:    00000000   Flags:   NOQUEUE SYNCSTS SYSTEM
Par. id:  00000000   Granted at    EX            CVTSYS
Sublocks:        1
LKB:      80D0B8A0
Resource:      5F535953 24535953    SYS$SYS_  Status:  NOQUOTA
 Length   16   00000000 4C774449    IDwL....
 Exec. mode    00000000 00000000    ........
 System        00000000 00000000    ........
Local copy
  
  
Lock id:  00010004   PID:    00000000   Flags:   CONVERT SYNCSTS CVTSYS
Par. id:  00000000   Granted at    CR
Sublocks:       16
LKB:      80D091A0   BLKAST
Resource:      4D567624 42313146    F11B$vVM  Status:  NOQUOTA
 Length   18   20204E41 4A353153    S15JAN
 Kernel mode   00000000 00002020      ......
 System        00000000 00000000    ........
Local copy
  
  
Lock id:  00280009   PID:    00000000   Flags:   VALBLK  CONVERT SYNCSTS
Par. id:  00000000   Granted at    CR            NOQUOTA CVTSYS
Sublocks:        0
LKB:      80CDA880
Resource:      52414B5F 24535953    SYS$_KAR  Status:  MSTCPY
 Length   17   30415544 24455441    ATE$DUA0
 Kernel mode   00000000 0000003A    :.......
 System        00000000 00000000    ........
Master copy of lock 001C00F5 on system 000100A1
   .
   .
   .
SDA>  SHOW RESOURCE/LOCK=280009
Resource database
-----------------
Address of RSB:  80BD2150  Group grant mode:       CR
Parent RSB:      00000000  Conversion grant mode:  CR
Sub-RSB count:          0  BLKAST count:            0
Value block:   00000000 00000000 00000000 00000019   Seq. #:  0000002D
Resource:      52414B5F 24535953    SYS$_KAR 
 Length   17   30415544 24455441    ATE$DUA0         CSID:  00000000
 Kernel mode   00000000 0000003A    :.......
 System        00000000 00000000    ........
  
Granted queue (Lock ID / Gr mode):
     00DA1269  CR       00280009  CR       0094054D  CR
     00270B9F  CR       00D70BFE  CR       000D0F4F  CR
     000D1017  CR       00601418  CR       01131450  CR
     000F1964  CR       000200DF  CR
  
Conversion queue (Lock ID / Gr/Rq mode):
     *** EMPTY QUEUE ***
 
Waiting queue (Lock ID / Rq mode):
     *** EMPTY QUEUE ***

This SDA session shows the output of the SHOW LOCK command for several locks. The SHOW RESOURCE command, executed for the last displayed lock, verifies that the lock is in the resource's granted queue, among many other locks given concurrent read (CR) access to the resource. (See Table SDA-21 for a full explanation of the contents of the display of the SHOW RESOURCE command.)

#2
SDA SHOW LOCK/CACHE Lock database ------------- Lock id: 6D000032 PID: 00010028 Flags: VALBLK SYNCSTS SYSTEM Par. id: 01000002 SUBLCKs: 0 NOQUOTA LKB: 80F67C00 BLKAST: 00000000 PRIORTY: 0000 Granted at PW 00000000-FFFFFFFF Resource: 00257324 42313146 F11B$s%. Status: NOQUOTA CACHED Length 10 00000000 00000000 ........ Kernel mode 00000000 00000000 ........ System 00000000 00000000 ........ Local copy Lock id: 7B00003B PID: 0001000B Flags: VALBLK SYNCSTS SYSTEM Par. id: 01000002 SUBLCKs: 0 NOQUOTA LKB: 80F51F80 BLKAST: 00000000 PRIORTY: 0000 Granted at PW 00000000-FFFFFFFF Resource: 08E97324 42313146 F11B$sé. Status: NOQUOTA CACHED Length 10 00000000 00000000 ........ Kernel mode 00000000 00000000 ........ System 00000000 00000000 ........ . . . Local copy

SDA SHOW LOCK/CACHE
Lock database 
------------- 
 
Lock id:  6D000032   PID:     00010028   Flags:   VALBLK  SYNCSTS SYSTEM  
Par. id:  01000002   SUBLCKs:        0            NOQUOTA                 
LKB:   80F67C00   BLKAST:  00000000                                   
PRIORTY:      0000                                                        
 
Granted at      PW   00000000-FFFFFFFF 
 
Resource:      00257324 42313146    F11B$s%.  Status:  NOQUOTA CACHED          
 Length   10   00000000 00000000    ........                                   
 Kernel mode   00000000 00000000    ........                                   
 System        00000000 00000000    ........                                   
 
Local copy  
 
Lock id:  7B00003B   PID:     0001000B   Flags:   VALBLK  SYNCSTS SYSTEM  
Par. id:  01000002   SUBLCKs:        0            NOQUOTA                 
LKB:   80F51F80   BLKAST:  00000000                                   
PRIORTY:      0000                                                        
 
Granted at      PW   00000000-FFFFFFFF 
 
Resource:      08E97324 42313146    F11B$sé.  Status:  NOQUOTA CACHED          
 Length   10   00000000 00000000    ........                                   
 Kernel mode   00000000 00000000    ........                                   
 System        00000000 00000000    ........                                   
 
   .
   .
   .
Local copy

This example of the SHOW LOCK/CACHE command displays the contents of cached lock blocks (LKBs).

SHOW LOGS

Displays information about transaction logs currently open for the node.

Format

SHOW LOGS [/qualifier[,...]]

Qualifier

/DISPLAY=(item [,...])
Specifies the type of information to be displayed. The argument to /DISPLAY can be either a single item or a list. The following items can be specified.

Item Description

ALL All transaction log control structure information. This is the default behavior.

OPENS Transaction log open requests.

READS Transaction log read requests.

WRITES Transaction log write requests.

Item	Description
ALL	All transaction log control structure information. This is the default behavior.
OPENS	Transaction log open requests.
READS	Transaction log read requests.
WRITES	Transaction log write requests.

Example


SDA> SHOW LOGS/DISPLAY=(OPENS, WRITES)

The SHOW LOGS command displays the log open request and log write request information for all open transaction logs for the node.

SHOW PAGE_TABLE

Displays a range of system page table entries, the entire system page table, or the entire global page table.

Format

SHOW PAGE_TABLE [/qualifier[,...]] [range]

Parameter

range
Range of virtual addresses for which SDA is to display page table entries. You can express a range using the following format:

m:n Range of virtual addresses from m to n

m;n Range of virtual addresses starting at m and continuing for n bytes

Qualifiers

/GLOBAL
Lists the global page table.
/SYSTEM
Lists the system page table.
/ALL
Lists both the global and system page tables. This is the default behavior of SHOW PAGE_TABLE.

Description

For each virtual address displayed by the SHOW PAGE_TABLE command, the first six columns of the listing provide the associated page table entry and describe its location, characteristics, and contents (see Table SDA-16). SDA obtains this information from the system page table.
If the virtual page has been mapped to a physical page, the last nine columns of the listing include information from the page frame number (PFN) database (see Table SDA-17). Otherwise, the section is left blank.
SDA indicates pages are inaccessible by displaying the following message:
-------- n NULL PAGES
Here, n indicates the number of inaccessible pages.
Table SDA-16 Virtual Page Information in the SHOW PAGE_TABLE Display
Value Meaning

ADDRESS System virtual address that marks the base of the virtual page.

SVAPTE System virtual address of the page table entry that maps the virtual page.

PTE Contents of the page table entry, a longword that describes a system virtual page.

Type Type of virtual page. There are the following eight types:

VALID
Valid page (in main memory).
TRANS
Transitional page (between main memory and page lists).
DZERO
Demand-allocated, zero-filled page.
PGFIL
Page within a paging file.
STX
Section table's index page.
GPTX
Index page for a global page table.
IOPAG
Page in I/O address space.
NXMEM
Page not represented in physical memory. The page frame number (PFN) of this page is not mapped by any of the system's memory controllers. This indicates an error condition.

PROT Protection code, derived from bits in the PTE, that designates the type of access (read or write, or both) granted to processor access modes (kernel, executive, supervisor, or user).

Bits Letters that represent the setting of a bit or a combination of bits in the PTE. These bits indicate attributes of a page. The following codes are listed:

M
Page has been modified.
L
Page is locked into a working set.
K
Owner can access the page in kernel mode.
E
Owner can access the page in executive mode.
S
Owner can access the page in supervisor mode.
U
Owner can access the page in user mode.

Table SDA-17 Physical Page Information in the SHOW PAGE_TABLE Display
Category Meaning

PAGTYP Type of physical page. One of the following six types:

PROCESS
Page is part of process space.
SYSTEM
Page is part of system space.
GLOBAL
Page is part of a global section.
PPGTBL
Page is part of a process's page table.
GPGTBL
Page is part of a global page table.
GBLWRT
Page is part of a global, writable section.

LOC Location of the page within the system. One of the following eight locations:

ACTIVE
Page is in a working set.
MDFYLST
Page is in the modified page list.
FREELST
Page is in the free page list.
BADLST
Page is in the bad page list.
RELPEND
Release of the page is pending.
RDERROR
Page has had an error during an attempted read operation.
PAGEOUT
Page is being written into a paging file.
PAGEIN
Page is being brought into memory from a paging file.

STATE Byte that describes the state of the physical page.

TYPE Byte that describes the type of virtual page. The types in this column are the hexadecimal codes that stand for the page types that appear in column PAGTYP of this display, described previously.

REFCOUNT Count of the processes that are referencing this PFN. If the value of REFCOUNT is nonzero, the page is used in at least one working set. If the value is zero, the page is not used in any working set.

BAK Address of the backing store; location on a disk device to which pages can be written.

SVAPTE Virtual address associated with this page frame. The two SVAPTEs indicate a valid link between physical and virtual address space.

FLINK Forward link within PFN database that points to the next virtual page. This longword also acts as the count of the number of processes that are sharing this global section.

BLINK Backward link within PFN database. Also acts as an index into the working set list.

**Table SDA-16 Virtual Page Information in the SHOW PAGE_TABLE Display**
Value	Meaning
ADDRESS	System virtual address that marks the base of the virtual page.
SVAPTE	System virtual address of the page table entry that maps the virtual page.
PTE	Contents of the page table entry, a longword that describes a system virtual page.
Type	Type of virtual page. There are the following eight types: VALID Valid page (in main memory). TRANS Transitional page (between main memory and page lists). DZERO Demand-allocated, zero-filled page. PGFIL Page within a paging file. STX Section table's index page. GPTX Index page for a global page table. IOPAG Page in I/O address space. NXMEM Page not represented in physical memory. The page frame number (PFN) of this page is not mapped by any of the system's memory controllers. This indicates an error condition.
PROT	Protection code, derived from bits in the PTE, that designates the type of access (read or write, or both) granted to processor access modes (kernel, executive, supervisor, or user).
Bits	Letters that represent the setting of a bit or a combination of bits in the PTE. These bits indicate attributes of a page. The following codes are listed: M Page has been modified. L Page is locked into a working set. K Owner can access the page in kernel mode. E Owner can access the page in executive mode. S Owner can access the page in supervisor mode. U Owner can access the page in user mode.

**Table SDA-17 Physical Page Information in the SHOW PAGE_TABLE Display**
Category	Meaning
PAGTYP	Type of physical page. One of the following six types: PROCESS Page is part of process space. SYSTEM Page is part of system space. GLOBAL Page is part of a global section. PPGTBL Page is part of a process's page table. GPGTBL Page is part of a global page table. GBLWRT Page is part of a global, writable section.
LOC	Location of the page within the system. One of the following eight locations: ACTIVE Page is in a working set. MDFYLST Page is in the modified page list. FREELST Page is in the free page list. BADLST Page is in the bad page list. RELPEND Release of the page is pending. RDERROR Page has had an error during an attempted read operation. PAGEOUT Page is being written into a paging file. PAGEIN Page is being brought into memory from a paging file.
STATE	Byte that describes the state of the physical page.
TYPE	Byte that describes the type of virtual page. The types in this column are the hexadecimal codes that stand for the page types that appear in column PAGTYP of this display, described previously.
REFCOUNT	Count of the processes that are referencing this PFN. If the value of REFCOUNT is nonzero, the page is used in at least one working set. If the value is zero, the page is not used in any working set.
BAK	Address of the backing store; location on a disk device to which pages can be written.
SVAPTE	Virtual address associated with this page frame. The two SVAPTEs indicate a valid link between physical and virtual address space.
FLINK	Forward link within PFN database that points to the next virtual page. This longword also acts as the count of the number of processes that are sharing this global section.
BLINK	Backward link within PFN database. Also acts as an index into the working set list.

Example


SDA>SHOW PAGE_TABLE System page table ----------------- ADDRESS SVAPTE PTE TYPE PROT BITS PAGTYP LOC STATE TYPE REFCNT BAK SVAPTE FLINK BLINK . . . 8014B000 8AD22E00 F8020725 VALID UR K 8014B200 8AD22E04 F8020726 VALID UR K 8014B400 8AD22E08 F8020727 VALID UR K 8014B600 8AD22E0C F8020728 VALID UR K 8014B800 8AD22E10 F8020729 VALID UR K 8014BA00 8AD22E14 EC02072A VALID UREW M K 8014BC00 8AD22E18 F402072B VALID URKW M K . . . 8014BE00 8AD22FEC F801F10E VALID UR K SYSTEM ACTIVE 07 01 1 0040FFF8 8AD22FEC 00000000 00000258 8014C000 8AD22FF0 F801F10F VALID UR K SYSTEM ACTIVE 07 01 1 0040FFF8 8AD22FF0 00000000 00000257 8014C200 8AD22FF4 F801F173 VALID UR K SYSTEM ACTIVE 07 01 1 0040FFF8 8AD22FF4 00000000 000004B1 8014C400 8AD22FF8 F801F172 VALID UR K SYSTEM ACTIVE 07 01 1 0040FFF8 8AD22FF8 00000000 00000301 8014C600 8AD22FFC F801F17F VALID UR K SYSTEM ACTIVE 07 01 1 0040FFF8 8AD22FFC 00000000 000000F5 8014C800 8AD23000 F801F17E VALID UR K SYSTEM ACTIVE 07 01 1 0040FFF8 8AD23000 00000000 00000174 8014CA00 8AD23004 7801EBC6 TRANS UR K SYSTEM FREELST 00 01 0 0040FFF8 8AD23004 0000D38B 0001EBC7 . . .

SDA>SHOW PAGE_TABLE
System page table 
----------------- 
 
ADDRESS  SVAPTE   PTE      TYPE  PROT  BITS PAGTYP LOC  STATE TYPE REFCNT BAK     SVAPTE    FLINK      BLINK 
   .
   .
   .
8014B000 8AD22E00 F8020725 VALID UR       K 
8014B200 8AD22E04 F8020726 VALID UR       K 
8014B400 8AD22E08 F8020727 VALID UR       K 
8014B600 8AD22E0C F8020728 VALID UR       K 
8014B800 8AD22E10 F8020729 VALID UR       K 
8014BA00 8AD22E14 EC02072A VALID UREW  M  K 
8014BC00 8AD22E18 F402072B VALID URKW  M  K 
   .
   .
   .
8014BE00 8AD22FEC F801F10E VALID UR       K SYSTEM ACTIVE  07  01   1 0040FFF8   8AD22FEC  00000000  00000258 
8014C000 8AD22FF0 F801F10F VALID UR       K SYSTEM ACTIVE  07  01   1 0040FFF8   8AD22FF0  00000000  00000257 
8014C200 8AD22FF4 F801F173 VALID UR       K SYSTEM ACTIVE  07  01   1 0040FFF8   8AD22FF4  00000000  000004B1 
8014C400 8AD22FF8 F801F172 VALID UR       K SYSTEM ACTIVE  07  01   1 0040FFF8   8AD22FF8  00000000  00000301 
8014C600 8AD22FFC F801F17F VALID UR       K SYSTEM ACTIVE  07  01   1 0040FFF8   8AD22FFC  00000000  000000F5 
8014C800 8AD23000 F801F17E VALID UR       K SYSTEM ACTIVE  07  01   1 0040FFF8   8AD23000  00000000  00000174 
8014CA00 8AD23004 7801EBC6 TRANS UR       K SYSTEM FREELST 00  01   0 0040FFF8   8AD23004  0000D38B  0001EBC7 
   .
   .
   .

SHOW PFN_DATA

Displays information that is contained in the page lists and PFN database.

Format

SHOW PFN_DATA [pfn] [/qualifier]

Parameter

pfn
Page frame number (PFN) of the physical page for which information is to be displayed.

Qualifiers

/ALL
Displays the free page list, modified page list, and bad page list. This is the default behavior of the SHOW PFN_DATA command. SDA precedes each list with a count of the pages it contains and its low and high limits.
/BAD
Displays the bad page list. SDA precedes the list with a count of the pages it contains, its low limit, and its high limit.
/FREE
Displays the free page list. SDA precedes the list with a count of the pages it contains, its low limit, and its high limit.
/MODIFIED
Displays the modified page list. SDA precedes the list with a count of the pages it contains, its low limit, and its high limit.
/SYSTEM
Displays the entire PFN database in order by page frame number, starting at PFN 0000.

Description

For each page frame number it displays, the SHOW PFN_DATA command lists information used in translating physical page addresses to virtual page addresses. Table SDA-18 lists the contents of the display.

Table SDA-18 Page Frame Number Information in the SHOW PFN_DATA Display
Item Contents

PFN Page frame number

PTE ADDRESS System virtual address of the page table entry that describes the virtual page mapped into this physical page

BAK Place to find context, as information about this page when all links to this PTE are broken: either an index into a process section table or the number of a virtual block in the paging file

REFCNT Number of references being made to this page

FLINK Address of the next page in the list in which this virtual page currently resides

BLINK Address of the previous page in the list in which this virtual page currently resides

TYPE Type of virtual page; one of the following:

00
Process page
01
System page
02
Global, read-only page
03
Global, read/write page
04
Process page-table page
05
Global page-table page

STATE State of the virtual page, the low nibble of which can be one of the following:

0
Page is on the free page list.
1
Page is on the modified page list.
2
Page is on the bad page list.
3
Release of the page to the free or modified page list is pending.
4
Error occurred as the page was being read from the disk.
5
Modified page writer is currently writing the page to the disk.
6
Page fault handler is currently reading the page from the disk.
7
Page is active and valid.

**Table SDA-18 Page Frame Number Information in the SHOW PFN_DATA Display**
Item	Contents
PFN	Page frame number
PTE ADDRESS	System virtual address of the page table entry that describes the virtual page mapped into this physical page
BAK	Place to find context, as information about this page when all links to this PTE are broken: either an index into a process section table or the number of a virtual block in the paging file
REFCNT	Number of references being made to this page
FLINK	Address of the next page in the list in which this virtual page currently resides
BLINK	Address of the previous page in the list in which this virtual page currently resides
TYPE	Type of virtual page; one of the following: 00 Process page 01 System page 02 Global, read-only page 03 Global, read/write page 04 Process page-table page 05 Global page-table page
STATE	State of the virtual page, the low nibble of which can be one of the following: 0 Page is on the free page list. 1 Page is on the modified page list. 2 Page is on the bad page list. 3 Release of the page to the free or modified page list is pending. 4 Error occurred as the page was being read from the disk. 5 Modified page writer is currently writing the page to the disk. 6 Page fault handler is currently reading the page from the disk. 7 Page is active and valid.

Example


SDA>SHOW PFN_DATA Free page list -------------- Count: 225 Low limit: 57 High limit: 1073741824 PFN PTE ADDRESS BAK REFCNT FLINK BLINK TYPE STATE ---- ----------- -------- ------ ----- ----- ---------- ---------- 1329 8047AF3C 03002A83 0 1963 0000 00 PROCESS 00 FREELST 1963 8047AB10 03002A43 0 017C 1329 00 PROCESS 00 FREELST 017C 8047B3F8 03002A84 0 14B4 1963 00 PROCESS 00 FREELST 14B4 8047B464 03002A85 0 1529 017C 00 PROCESS 00 FREELST 1529 8047AA34 03002A87 0 1485 14B4 00 PROCESS 00 FREELST 1485 8047AC80 030010B3 0 1707 1529 00 PROCESS 00 FREELST . . .

SDA>SHOW PFN_DATA
Free page list
--------------
Count:             225
Low limit:          57
High limit: 1073741824
PFN   PTE ADDRESS   BAK     REFCNT FLINK BLINK    TYPE        STATE
----  ----------- --------  ------ ----- -----  ----------  ----------
1329    8047AF3C  03002A83      0   1963 0000   00 PROCESS  00 FREELST
1963    8047AB10  03002A43      0   017C 1329   00 PROCESS  00 FREELST
017C    8047B3F8  03002A84      0   14B4 1963   00 PROCESS  00 FREELST
14B4    8047B464  03002A85      0   1529 017C   00 PROCESS  00 FREELST
1529    8047AA34  03002A87      0   1485 14B4   00 PROCESS  00 FREELST
1485    8047AC80  030010B3      0   1707 1529   00 PROCESS  00 FREELST
   .
   .
   .

In this example, the SHOW PFN_DATA command displays the information for the free page list, the modified page list, and the bad page list, and then all of the PFN database, including the first three lists.

Contents

Index

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m:n	Range of virtual addresses from m to n
m;n	Range of virtual addresses starting at m and continuing for n bytes

OpenVMS VAX System Dump Analyzer Utility Manual

SHOW LOCK

Format

SHOW LOCK {lock-id|/ALL|/CACHED|/NAME=resource-name}

Parameters

lock-id

Qualifiers

/ALL

/CACHED

/NAME=resource-name

Description

Examples

SHOW LOGS

Format

SHOW LOGS [/qualifier[,...]]

Qualifier

/DISPLAY=(item [,...])

Example

SHOW PAGE_TABLE

Format

SHOW PAGE_TABLE [/qualifier[,...]] [range]

Parameter

range

Qualifiers

/GLOBAL

/SYSTEM

/ALL

Description

Example

SHOW PFN_DATA

Format

SHOW PFN_DATA [pfn] [/qualifier]

Parameter

pfn

Qualifiers

/ALL

/BAD

/FREE

/MODIFIED

/SYSTEM

Description

Example