linux-kernel - Re: [QUICKLIST 0/6] Arch independent quicklists V1

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Message-Id: <20070315.003118.41650094.davem@davemloft.net>
Date:	Thu, 15 Mar 2007 00:31:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	akpm@...ux-foundation.org
Cc:	paulus@...ba.org, clameter@....com, linux-kernel@...r.kernel.org,
	ak@...e.com, holt@....com, linux-ia64@...r.kernel.org,
	mpm@...enic.com
Subject: Re: [QUICKLIST 0/6] Arch independent quicklists V1

From: Andrew Morton <akpm@...ux-foundation.org>
Date: Thu, 15 Mar 2007 00:22:49 -0800

> So...  what would happen if sparc64 were to use neither quicklists nor
> slab?  Just grab these pages from the page allocator and clear them?

The page table allocator is heavier weight than the quicklists,
although obviously not as heavy weight as SLAB.

I know special purpose allocation lists suck, but they really help in
this case in my opinion.

And for the x86 cases it's not going to help to have GFP_ZERO stuff
via the page allocator for page tables, they have to have specific
bits in the pre-initialized areas for the kernel PGDs, not just zero.
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