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    SubjectRe: slab: setup allocators earlier in the boot sequence
    Hi Christoph,

    On Fri, 2009-06-12 at 09:49 -0400, Christoph Lameter wrote:
    > Best thing to do is to recognize the fact that we are still in early boot
    > in the allocators. Derived allocators (such as slab and vmalloc) mask bits
    > using GFP_RECLAIM_MASK and when doing allocations through the page
    > allocator. You could make GFP_RECLAIM_MASK a variable. During boot
    > __GFP_WAIT would not be set in GFP_RECLAIM_MASK.

    Ben's patch does something like that and I have patches that do that
    floating around too.

    The problem here is that it's not enough that we make GFP_RECLAIM_MASK a
    variable. There are various _debugging checks_ that happen much earlier
    than that. We need to mask out those too which adds overhead to
    kmalloc() fastpath, for example.


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