Re: [PATCH] swapin readahead and fixes

[Billy Harvey <Billy.Harvey@thrillseeker.net>]

Rik van Riel wrote:
> 
> On Mon, 7 Dec 1998, Billy Harvey wrote:
> 
> > Has anyone ever looked at the following concept?  In addition to a
> > swap-in read-ahead, have a swap-out write-ahead.  The idea is to use
> > all the avaialble swap space as a mirror of memory.
> 
> We do something a bit like this in 2.1.130+. Writing out all
> pages to swap will use far too much I/O bandwidth though, so
> we will never do that...
> 
Rik,

That's my point though about not taking I/O time away from other tasks. 
Only mirror pages to swap if there's nothing else blocked for I/O - put
any free time to work, and mirror pages if swap memory allows in
anticipation that it may be swapped out later.  I suppose a
least-recently-used approach on the pages would have the highest
payback.  I realize the CPU may be used a little more, but other than
rc5des it's idle a good bit of the time anyway - perhaps this could be
one step above an idle task.

Billy
-- 
Billy.Harvey@thrillseeker.net
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