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

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Message-ID: <17911.14998.938879.432788@cargo.ozlabs.ibm.com>
Date:	Wed, 14 Mar 2007 10:58:14 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>, clameter@....com,
	linux-mm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [QUICKLIST 0/4] Arch independent quicklists V2

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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