On Fri, 2005-01-21 at 12:29 -0800, Christoph Lameter wrote:

Adds management of ZEROED and NOT_ZEROED pages and a background daemon
called scrubd. scrubd is disabled by default but can be enabled
by writing an order number to /proc/sys/vm/scrub_start. If a page
is coalesced of that order or higher then the scrub daemon will
start zeroing until all pages of order /proc/sys/vm/scrub_stop and
higher are zeroed and then go back to sleep.

Some architectures tend to have spare DMA engines lying around. There's
no need to use the CPU for zeroing pages. How feasible would it be for
scrubd to use these?

-- 
dwmw2

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