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    SubjectRe: slab: setup allocators earlier in the boot sequence
    On Fri, 2009-06-12 at 16:54 +0300, Pekka Enberg wrote:
    > 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.

    Hrm... I though I stuck my masking before the lockdep tests but maybe I
    missed some...

    Again, I'm not saying my patch is the best way to solve it. My point is
    more that the callers shouldn't have to bother. (And thus the WARN_ON
    isn't right :-)


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