Re: [PATCH 00/35] Cleanup and optimise the page allocator V3

[Nick Piggin]

On Mon, Mar 16, 2009 at 09:45:55AM +0000, Mel Gorman wrote:
> Here is V3 of an attempt to cleanup and optimise the page allocator and should
> be ready for general testing. The page allocator is now faster (16%
> reduced time overall for kernbench on one machine) and it has a smaller cache
> footprint (16.5% less L1 cache misses and 19.5% less L2 cache misses for
> kernbench on one machine). The text footprint has unfortunately increased,
> largely due to the introduction of a form of lazy buddy merging mechanism
> that avoids cache misses by postponing buddy merging until a high-order
> allocation needs it.

You!? You want to do lazy buddy? ;) That's wonderful, but it would
significantly increase the fragmentation problem, wouldn't it?
(although pcp lists are conceptually a form of lazy buddy already)

No objections from me of course, if it is making significant
speedups. I assume you mean overall time on kernbench is overall sys
time?

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