On Tue, 1 Feb 2005, Mel Gorman wrote:

quoted

Would it not be better to zero the global 2^MAX_ORDER pages by the scrub
daemon and have a global zeroed page list? That way you may avoid zeroing
when splitting pages?

Maybe, but right now when there are no 2^MAX_ORDER pages, the scrub daemon
is going to be doing nothing which is why I think it needs to look at the
free pages of lower orders.

That is solveable though in one of two ways. One, the scrub daemon can
zero pages from the global list and then add them to the USERZERO pool. It
has the advantage of requiring no more memory and is simple. The second is
to create a second global list. However, I think it only makes sense to
have this as part of the scrub daemon patch (I can write it if thats a
problem) rather than a standalone patch from me.

Approach one is fine and I will do an update the remaining prezero patches
to do just that. When will your patches be in Linus tree? ;-)


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