The patch titled
uml: allow finer tuning for host VMSPLIT setting
has been added to the -mm tree. Its filename is
uml-allow-finer-tuning-for-host-vmsplit-setting.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: uml: allow finer tuning for host VMSPLIT setting
From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>
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@xxxxxxxx>
Cc: Jeff Dike <jdike@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/um/Kconfig.i386 | 49 ++++++++++++++++++++++++++++-------------
1 files changed, 34 insertions(+), 15 deletions(-)
diff -puN arch/um/Kconfig.i386~uml-allow-finer-tuning-for-host-vmsplit-setting arch/um/Kconfig.i386
--- a/arch/um/Kconfig.i386~uml-allow-finer-tuning-for-host-vmsplit-setting
+++ a/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)"
_
Patches currently in -mm which might be from blaisorblade@xxxxxxxx are
uml-fix-compilation-options-for-user_objs.patch
uml-revert-wrong-patch.patch
uml-correct-removal-of-pte_mkexec.patch
uml-readd-forgot-prototype.patch
uml-make-tt-mode-compile-after-setjmp-related-changes.patch
uml-make-uml_setjmp-always-safe.patch
uml-fix-processor-selection-to-exclude-unsupported-processors-and-features.patch
uml-fix-uname-under-setarch-i386.patch
uml-declare-in-kconfig-our-partial-lockdep-support.patch
uml-allow-using-again-x86-x86_64-crypto-code.patch
uml-asm-offsets-duplication-removal.patch
uml-remove-duplicate-export.patch
uml-deprecate-config_mode_tt.patch
uml-allow-finer-tuning-for-host-vmsplit-setting.patch
-
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