On Mon, 5 Mar 2001, Mike Galbraith wrote:
> On Sun, 4 Mar 2001, Ulrich Kunitz wrote:
>
> > patch-uk2 makes use of the pgd, pmd and pte quicklists for x86 too;
> > risky: there might be a reason that 2.4.x doesn't use the
> > quicklists.
>
> I remember these being taken out (long ago), but not why. Anyone?
They probably wasted too much memory ...
Having _2_ quicklists per CPU (on SMP) is probably the way
to go: one with zeroed pages and one with non-zeroed pages.
This should avoid cache contention in __alloc_pages() and
also avoid unneeded zeroing of pages (when we put away a
zeroed page, eg. an freed pagetable page).
On UP we probably want a (smaller) freelist with zeroed
pages only, since that means we can keep more pages on the
inactive_clean list.
regards,
Rik
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