On Tue, Mar 07, 2006 at 12:53:27PM +1100, Nick Piggin wrote:
> You can't do this because you can't test PageLRU like that.
>
> Have a look in the lkml archives a few months back, where I proposed
> a way to do this for __free_pages(). You can't do it for put_page.
Even if we know that we are the last user of the page (the count is 1)?
Who can bump the page's count then?
> BTW I have quite a large backlog of patches in -mm which should end
> up avoiding an atomic or two around these parts.
That certainly looks like it will help. Not taking the spinlock
unconditionally gets rid of quite a bit of the cost.
-ben
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