Re: [QUICKLIST 0/4] Arch independent quicklists V2

[Paul Mackerras]

Andrew Morton writes:

> Plus, we can get in a situation where take a cache-cold, known-zero page
> from the pte quicklist when there is a cache-hot, non-zero page sitting in
> the page allocator.  I suspect that zeroing the cache-hot page would take a
> similar amount of time to a single miss agains the cache-cold page.

That is certainly the case on powerpc.

> I'm not saying that I _know_ that the quicklists are pointless, but I don't
> think it's established that they are pointful.

I don't see much point to them.  For powerpc, I would rather grab an
arbitrary page and zero it than get a page off a quicklist.

> Maybe, dunno.  It was apparently a win on powerpc many years ago.  I had a

My recollection was that it wasn't a win, but it was a long time ago...

Paul.
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