Messages in this thread | | | Subject | Re: slab: setup allocators earlier in the boot sequence | From | Pekka Enberg <> | Date | Fri, 12 Jun 2009 16:54:12 +0300 |
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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.
Pekka
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