"Paul Clements wrote:"
> "Peter T. Breuer" wrote:
> > Curiously enough, I'm slightly more nonplussed by the problem of
> > kfreeing the bitmap pages when their dirty count drops to zero.
> > What should I do? Maintain a how-many-times-we-have-wanted-to-free-this
> > page count and only free it on the 10th attempt?
>
> hmm...perhaps an LRU approach? you could store a timestamp (jiffies?),
> so that you never deallocate a page unless it hasn't been used in X
> amount of time...might be too heavyweight for what you're trying to do
This is not silly, but is too heavyweight to do each time a bit is set.
The best thing to do is probably either or both of
a) put the notionally freed pages on a free list and allocate from
that list first when we want a new page
b) do a periodic sweep for clean pages and free them.
Peter
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