Re: A scrub daemon (prezeroing)

[Robin Holt]

On Thu, Jan 27, 2005 at 12:15:24PM +0000, David Woodhouse wrote:
> 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?

An earlier proposal that Christoph pushed would have used the BTE on
sn2 for this.  Are you thinking of using the BTE on sn0/sn1 mips?

Robin
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