On 05/30/2011 05:10 PM, Ingo Molnar wrote:
> [...] Windows has a zeroing thread which causes all of RAM to be > committed shortly after boot, though. heh, maybe they read lkml and copied my ancient idea: http://people.redhat.com/mingo/clearpage-patches/clearpage-2.3.18-J1 An earlier version had a 'zerod' (page zeroing kernel thread). This was one of my more stupid ideas btw.
I think that with a dma engine it makes sense. We've got an extra resource, why not utilize it in the background? Some workloads generate a lot of demand for zero pages.
I agree that using the cpu to clear memory is not a good idea, it just causes cache pollution.
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