Q: Is there a "swapped page dirty tag" already?
reason: if a page in mem had already been swapped out and is going
to be swapped out again and it has not been written to, the page
could just be deleted from mem. Is this a rare case?
Can we make it less rare? We could fill up swap with pages
which are unlikely to change and "remeber" them
there until swapspace is needed for new ones.
if we don't need to write to disk for a swap-out, it should be
a performance gain.
So, if we have a large swap space and we have at some time written
all pages to that space which are not subject to change regularly
(mostly program code I think), we can always free some page instantly
instead writing it to disk - because it's already there.
(maybe again this is just nonsense for some reason)
A. Newbie
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