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authorBob Picco <bob.picco@hp.com>2005-09-03 15:54:28 -0700
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 00:05:38 -0700
commit3e347261a80b57df792ab9464b5f0ed59add53a8 (patch)
tree047b35e0f9ec82b3beeff882a9af6292a500097c /include/asm-um
parent802f192e4a600f7ef84ca25c8b818c8830acef5a (diff)
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[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>
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