Re: [RFC] Changing COW detection to be memory hotplug friendly

[Andrea Arcangeli]

> By the way, while we're talking of remove_exclusive_swap_page:
> a more functional issue I sometimes wonder about, why don't we
> remove_exclusive_swap_page on write fault?  Keeping the swap slot
> is valuable if read fault, but once the page is dirtied, wouldn't
> it usually be better to free that slot and allocate another later?

Avoiding swap fragmentation is one reason to leave it allocated. So you
can swapin/swapout/swapin/swapout always in the same place on disk as
long as there's plenty of swap still available. I'm not sure how much
speedup this provides, but certainly it makes sense.
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