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authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2006-10-11 01:21:42 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-11 11:14:21 -0700
commitc21be1c9c1ab42fe285a74f184e1acbc37ee084b (patch)
treed9f7b20e39ed9cd0fa1cbb3694bbc21be8e3b5de /arch/um/Kconfig.i386
parent[PATCH] uml: deprecate CONFIG_MODE_TT (diff)
downloadlinux-dev-c21be1c9c1ab42fe285a74f184e1acbc37ee084b.tar.xz
linux-dev-c21be1c9c1ab42fe285a74f184e1acbc37ee084b.zip
[PATCH] uml: allow finer tuning for host VMSPLIT setting
Now that various memory splits are enabled, add a config option allowing the user to compile UML for its need - HOST_2G_2G allowed to choose either 3G/1G or 2G/2G, and enabling it reduced the usable virtual memory. Detecting this at run time should be implemented in the future, but we must make the stop-gap measure work well enough (this is valid in _many_ cases). Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to '')
-rw-r--r--arch/um/Kconfig.i38649
1 files changed, 34 insertions, 15 deletions
diff --git a/arch/um/Kconfig.i386 b/arch/um/Kconfig.i386
index f6eb72d117b9..f191a550a079 100644
--- a/arch/um/Kconfig.i386
+++ b/arch/um/Kconfig.i386
@@ -16,23 +16,42 @@ config SEMAPHORE_SLEEPERS
bool
default y
-config HOST_2G_2G
- bool "2G/2G host address space split"
- default n
- help
- This is needed when the host on which you run has a 2G/2G memory
- split, instead of the customary 3G/1G.
-
- Note that to enable such a host
- configuration, which makes sense only in some cases, you need special
- host patches.
-
- So, if you do not know what to do here, say 'N'.
+choice
+ prompt "Host memory split"
+ default HOST_VMSPLIT_3G
+ ---help---
+ This is needed when the host kernel on which you run has a non-default
+ (like 2G/2G) memory split, instead of the customary 3G/1G. If you did
+ not recompile your own kernel but use the default distro's one, you can
+ safely accept the "Default split" option.
+
+ It can be enabled on recent (>=2.6.16-rc2) vanilla kernels via
+ CONFIG_VM_SPLIT_*, or on previous kernels with special patches (-ck
+ patchset by Con Kolivas, or other ones) - option names match closely the
+ host CONFIG_VM_SPLIT_* ones.
+
+ A lower setting (where 1G/3G is lowest and 3G/1G is higher) will
+ tolerate even more "normal" host kernels, but an higher setting will be
+ stricter.
+
+ So, if you do not know what to do here, say 'Default split'.
+
+ config HOST_VMSPLIT_3G
+ bool "Default split (3G/1G user/kernel host split)"
+ config HOST_VMSPLIT_3G_OPT
+ bool "3G/1G user/kernel host split (for full 1G low memory)"
+ config HOST_VMSPLIT_2G
+ bool "2G/2G user/kernel host split"
+ config HOST_VMSPLIT_1G
+ bool "1G/3G user/kernel host split"
+endchoice
config TOP_ADDR
- hex
- default 0xc0000000 if !HOST_2G_2G
- default 0x80000000 if HOST_2G_2G
+ hex
+ default 0xB0000000 if HOST_VMSPLIT_3G_OPT
+ default 0x78000000 if HOST_VMSPLIT_2G
+ default 0x40000000 if HOST_VMSPLIT_1G
+ default 0xC0000000
config 3_LEVEL_PGTABLES
bool "Three-level pagetables (EXPERIMENTAL)"