]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
[PATCH] sparsemem extreme implementation
authorBob Picco <bob.picco@hp.com>
Sat, 3 Sep 2005 22:54:28 +0000 (15:54 -0700)
committerLinus Torvalds <torvalds@evo.osdl.org>
Mon, 5 Sep 2005 07:05:38 +0000 (00:05 -0700)
commit3e347261a80b57df792ab9464b5f0ed59add53a8
tree047b35e0f9ec82b3beeff882a9af6292a500097c
parent802f192e4a600f7ef84ca25c8b818c8830acef5a
[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>
arch/i386/Kconfig
include/linux/mmzone.h
mm/Kconfig
mm/sparse.c