Re: [bug] SLUB + mm/slab.c boot crash in -rc9

On Tue, 15 Apr 2008, Linus Torvalds wrote:

On Tue, 15 Apr 2008, Ingo Molnar wrote:

btw., now with a second full day spent on this regression, i have
figured out a workaround the hard way: increasing SECTION_SIZE_BITS in
include/asm-x86/sparsemem.h from 26 to 27 makes it go away.

Interesting.

Hmmmm. SECTION_SIZE_BITS == 26 means SECTIONS_SHIFT == 6.
Increasing SECTION_SIZE_BITS to 27 reduces SECTION_SHIFT to 5. Thereby
the number of sparsemem sections (NR_MEM_SECTIONS) is reduced to half (64
to 32).
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