Re: [QUICKLIST 1/5] Quicklists for page table pages V3

[Christoph Lameter]

On Tue, 20 Mar 2007, Paul Mackerras wrote:

> Christoph Lameter writes:
> 
> > +static inline void *quicklist_alloc(int nr, gfp_t flags, void (*ctor)(void *))
> > +{
> 
> ...
> 
> > +	p = (void *)__get_free_page(flags | __GFP_ZERO);
> 
> This will cause problems on 64-bit powerpc, at least with 4k pages,
> since the pmd and pgd levels only use 1/4 of a page.

quicklists are only useful for page sized allocations. If you have smaller 
sizes then by all means continue the use of slab. You do not have a page 
struct for each pmd, pgd  to do bad things with (like i386) so everything 
is just fine.
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