On Wednesday 19 September 2007 03:44, Andrew Morton wrote:

On Tue, 18 Sep 2007 11:29:50 +1000 Nick Piggin [off-list ref] 

wrote:

quoted

It would be interesting to test -mm kernels. They have a patch which
reduces zone lock contention quite a lot.

They do?  Which patch?

Hmm... mm-buffered-write-cleanup.patch.

quoted

I think your patch is a nice idea, and with less zone lock contention in
other areas, it is possible that it might produce a relatively larger
improvement.

I'm a bit wobbly about this patch - it adds additional single-cpu overhead
to reduce multiple-cpu overhead and latency.

Yeah, that's true. Although maybe it gets significantly more after the
patch in -mm.

Possibly other page batching sites have similar issues on UP... I wonder
if a type of pagevec that turns into a noop on UP would be interesting...
probably totally unmeasurable and not worth the cost of code
maintenance ;)

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