Reserved page flaging of 2.4 kernel memory changed recently?

From: Michael Frank
Date: Wed Feb 04 2004 - 21:12:10 EST

The question is related to saving the kernel with swsusp.

Looking at 2.4.24 x86 kernel page flags, kernel memory is flaged reserved
the same way as video, BIOS pages.

Is this a recent change since using the aa vm and should it be like that?

If so, should hardware related reserved pages i.e video, BIOS be flaged
PG_nosave upon init?

What about iomemory?

Michael

Note: (Flags & 0x4000) == PG_reserved

# crash vmlinux
crash 3.7-5.2
Copyright (C) 2002, 2003 Red Hat, Inc.
Copyright (C) 1998-2003 Hewlett-Packard Co
Copyright (C) 1999, 2002 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions. Enter "help copying" to see the conditions.
This program has absolutely no warranty. Enter "help warranty" for details.

GNU gdb Red Hat Linux (5.3post-0.20021129.36rh)
Copyright 2003 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu"...

6c 14
WARNING: net_init: unknown device type for net device KERNEL: vmlinux
DUMPFILE: /dev/mem
CPUS: 1
DATE: Thu Feb 5 09:36:36 2004
UPTIME: 00:57:01
LOAD AVERAGE: 0.08, 0.02, 0.01
TASKS: 76
NODENAME: mhfl4
RELEASE: 2.4.24-mhf169
VERSION: #2 Sat Jan 31 16:03:07 HKT 2004
MACHINE: i686 (2399 Mhz)
MEMORY: 496 MB
PID: 1872
COMMAND: "crash"
TASK: cec66000
CPU: 0
STATE: TASK_RUNNING (ACTIVE)

crash> kmem -p
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
c100001c 0 0 0 0 4000
c1000048 1000 0 0 0 4000
c1000074 2000 0 0 0 4000
c10000a0 3000 0 0 0 4000
c10000cc 4000 0 0 0 0
c10000f8 5000 0 0 0 0
c1000124 6000 0 0 0 0
c1000150 7000 0 0 0 0
c100017c 8000 0 0 0 0
c10001a8 9000 0 0 0 0
c10001d4 a000 0 0 0 0
c1000200 b000 0 0 0 0
[]
c1001b70 9f000 0 0 0 4000
c1001b9c a0000 0 0 0 4000
c1001bc8 a1000 0 0 0 4000
c1001bf4 a2000 0 0 0 4000
c1001c20 a3000 0 0 0 4000
c1001c4c a4000 0 0 0 4000
c1001c78 a5000 0 0 0 4000
c1001ca4 a6000 0 0 0 4000
c1001cd0 a7000 0 0 0 4000
c1001cfc a8000 0 0 0 4000
c1001d28 a9000 0 0 0 4000
c1001d54 aa000 0 0 0 4000
c1001d80 ab000 0 0 0 4000
c1001dac ac000 0 0 0 4000
c1001dd8 ad000 0 0 0 4000
c1001e04 ae000 0 0 0 4000
[]
c1002b98 fd000 0 0 0 4000
c1002bc4 fe000 0 0 0 4000
c1002bf0 ff000 0 0 0 4000
c1002c1c 100000 0 0 0 4000
c1002c48 101000 0 0 0 4000
c1002c74 102000 0 0 0 4000
c1002ca0 103000 0 0 0 4000
c1002ccc 104000 0 0 1425 4000
c1002cf8 105000 0 0 0 4000
c1002d24 106000 0 0 0 4000
c1002d50 107000 0 0 0 4000
c1002d7c 108000 0 0 0 4000
c1002da8 109000 0 0 0 4000
[]
c100b2b0 40f000 0 0 0 4000
c100b2dc 410000 0 0 0 4000
c100b308 411000 0 0 0 4000
c100b334 412000 0 0 0 0
c100b360 413000 0 0 0 0
c100b38c 414000 0 0 0 0
c100b3b8 415000 0 0 0 0
c100b3e4 416000 0 0 0 0
c100b410 417000 0 0 0 0
c100b43c 418000 0 0 0 0
c100b468 419000 0 0 0 0
c100b494 41a000 0 0 0 0
c100b4c0 41b000 0 0 0 0
c100b4ec 41c000 0 0 0 0
c100b518 41d000 0 0 0 0
c100b544 41e000 0 0 0 0
c100b570 41f000 0 0 0 0
c100b59c 420000 0 0 0 0
c100b5c8 421000 0 0 0 0
c100b5f4 422000 0 0 0 0
c100b620 423000 0 0 0 0
c100b64c 424000 0 0 0 0
c100b678 425000 0 0 0 0
c100b6a4 426000 0 0 0 0
c100b6d0 427000 0 0 0 0
c100b6fc 428000 0 0 0 0
c100b728 429000 0 0 0 0
c100b754 42a000 0 0 0 0
c100b780 42b000 0 0 0 0
c100b7ac 42c000 0 0 0 0
c100b7d8 42d000 0 0 0 0
c100b804 42e000 0 0 0 0
c100b830 42f000 0 0 0 0
c100b85c 430000 0 0 0 4000
c100b888 431000 0 0 0 4000
c100b8b4 432000 0 0 0 4000
c100b8e0 433000 0 0 0 4000
c100b90c 434000 0 0 0 4000
c100b938 435000 0 0 0 4000
c100b964 436000 0 0 0 4000
c100b990 437000 0 0 0 4000
c100b9bc 438000 0 0 0 4000
c100b9e8 439000 0 0 0 4000
c100ba14 43a000 0 0 0 4000
[]
c100c6a0 483000 0 0 0 4000
c100c6cc 484000 0 0 0 4000
c100c6f8 485000 0 0 0 4000
c100c724 486000 0 0 0 4000
c100c750 487000 0 0 0 4000
c100c77c 488000 0 0 0 4000
c100c7a8 489000 0 0 0 0
c100c7d4 48a000 0 0 0 0
c100c800 48b000 0 0 0 0
c100c82c 48c000 0 0 0 0
c100c858 48d000 0 0 0 4000
c100c884 48e000 0 0 0 0
c100c8b0 48f000 0 0 0 0
c100c8dc 490000 0 0 0 0
c100c908 491000 0 0 0 0
c100c934 492000 0 0 0 0
c100c960 493000 0 0 0 0
c100c98c 494000 0 0 0 0
c100c9b8 495000 0 0 0 0
c100c9e4 496000 0 0 0 0
c100ca10 497000 0 0 0 0
c100ca3c 498000 0 0 0 0
c100ca68 499000 0 0 0 0
c100ca94 49a000 0 0 0 0
c100cac0 49b000 0 0 0 0




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