Re: [PATCH 01/16] slab: correct pfmemalloc check

[Christoph Lameter]

On Thu, 22 Aug 2013, Joonsoo Kim wrote:

> And, therefore we should check pfmemalloc in page flag of first page,
> but current implementation don't do that. virt_to_head_page(obj) just
> return 'struct page' of that object, not one of first page, since the SLAB
> don't use __GFP_COMP when CONFIG_MMU. To get 'struct page' of first page,
> we first get a slab and try to get it via virt_to_head_page(slab->s_mem).

Maybe using __GFP_COMP would make it consistent across all allocators and
avoid the issue? We then do only have to set the flags on the first page.
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