The patch titled
x86: enable VMSPLIT for highmem kernels
has been added to the -mm tree. Its filename is
x86-enable-vmsplit-for-highmem-kernels.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: x86: enable VMSPLIT for highmem kernels
From: Dave Hansen <haveblue@xxxxxxxxxx>
The current VMSPLIT Kconfig option is disabled whenever highmem is on.
This is a bit screwy because the people who need to change VMSPLIT the most
tend to be the ones with highmem and constrained lowmem.
So, remove the highmem dependency. But, re-include the dependency for the
"full 1GB of lowmem" option. You can't have the full 1GB of lowmem and
highmem because of the need for the vmalloc(), kmap(), etc... areas.
I thought there would be at least a bit of tweaking to do to
get it to work, but everything seems OK.
Boot tested on a 4GB x86 machine, and a 12GB 3-node NUMA-Q:
elm3b82:~# cat /proc/meminfo
MemTotal: 3695412 kB
MemFree: 3659540 kB
...
LowTotal: 2909008 kB
LowFree: 2892324 kB
...
elm3b82:~# zgrep PAE /proc/config.gz
CONFIG_X86_PAE=y
larry:~# cat /proc/meminfo
MemTotal: 11845900 kB
MemFree: 11786748 kB
...
LowTotal: 2855180 kB
LowFree: 2830092 kB
Signed-off-by: Dave Hansen <haveblue@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
diff -puN arch/i386/Kconfig~x86-enable-vmsplit-for-highmem-kernels arch/i386/Kconfig
--- a/arch/i386/Kconfig~x86-enable-vmsplit-for-highmem-kernels
+++ a/arch/i386/Kconfig
@@ -492,7 +492,7 @@ config HIGHMEM64G
endchoice
choice
- depends on EXPERIMENTAL && !X86_PAE
+ depends on EXPERIMENTAL
prompt "Memory split" if EMBEDDED
default VMSPLIT_3G
help
@@ -514,6 +514,7 @@ choice
config VMSPLIT_3G
bool "3G/1G user/kernel split"
config VMSPLIT_3G_OPT
+ depends on !HIGHMEM
bool "3G/1G user/kernel split (for full 1G low memory)"
config VMSPLIT_2G
bool "2G/2G user/kernel split"
_
Patches currently in -mm which might be from haveblue@xxxxxxxxxx are
bootmem-remove-useless-__init-in-header-file.patch
bootmem-mark-link_bootmem-as-part-of-the-__init-section.patch
bootmem-remove-useless-parentheses-in-bootmem-header.patch
bootmem-limit-to-80-columns-width.patch
bootmem-remove-useless-headers-inclusions.patch
bootmem-use-pfn-page-conversion-macros.patch
bootmem-miscellaneous-coding-style-fixes.patch
avr32-kill-config_discontigmem-support-completely.patch
x86-enable-vmsplit-for-highmem-kernels.patch
kthread-drivers-base-firmware_classc.patch
page-owner-tracking-leak-detector.patch
x86-e820-debugging.patch
-
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