Re: quicklists confuse meminfo

[Hugh Dickins]

On Mon, 10 Mar 2008, Andi Kleen wrote:
> Christoph Lameter <clameter@xxxxxxx> writes:
> > 
> > Zeroed pages however will not address the issue of having initialized pgd 
> > (which seems to be what i386 needs).
> 
> pgd is tiny on i386 PAE (4 * 16 bytes). Are you sure reinitializing that
> is a serious issue? ...

It used to be tiny (32 aligned bytes), then 2.6.22's quicklist enlarged
that to a whole (lowmem) page.  I think we were all too busy with other
stuff to protest loudly enough about that bloat.

If the quicklists are going, it'd be good for PAE to go back to a
kmem_cache of 32-byte entries as in 2.6.21 - I think Ingo's patch is
still using a whole page there.

Or have sl?b alignment changes, or virtualization issues (locking
per underlying struct page?), made a kmem_cache awkward there now?

Hugh
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