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authorBob Picco <bob.picco@hp.com>2005-09-04 02:54:28 +0400
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 11:05:38 +0400
commit3e347261a80b57df792ab9464b5f0ed59add53a8 (patch)
tree047b35e0f9ec82b3beeff882a9af6292a500097c /arch
parent802f192e4a600f7ef84ca25c8b818c8830acef5a (diff)
downloadlinux-3e347261a80b57df792ab9464b5f0ed59add53a8.tar.xz
[PATCH] sparsemem extreme implementation
With cleanups from Dave Hansen <haveblue@us.ibm.com> SPARSEMEM_EXTREME makes mem_section a one dimensional array of pointers to mem_sections. This two level layout scheme is able to achieve smaller memory requirements for SPARSEMEM with the tradeoff of an additional shift and load when fetching the memory section. The current SPARSEMEM implementation is a one dimensional array of mem_sections which is the default SPARSEMEM configuration. The patch attempts isolates the implementation details of the physical layout of the sparsemem section array. SPARSEMEM_EXTREME requires bootmem to be functioning at the time of memory_present() calls. This is not always feasible, so architectures which do not need it may allocate everything statically by using SPARSEMEM_STATIC. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Bob Picco <bob.picco@hp.com> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/i386/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 619d843ba231..dcb0ad098c60 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -754,6 +754,7 @@ config NUMA
depends on SMP && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI))
default n if X86_PC
default y if (X86_NUMAQ || X86_SUMMIT)
+ select SPARSEMEM_STATIC
# Need comments to help the hapless user trying to turn on NUMA support
comment "NUMA (NUMA-Q) requires SMP, 64GB highmem support"