Re: 2.6.9-rc1: page_referenced_one() CPU consumption

[Nick Piggin]

Hugh Dickins wrote:
> On Fri, 10 Sep 2004, Hugh Dickins wrote:
>
> > I'm quite content to go back to a trylock in page_referenced_one - and
> > in try_to_unmap_one?  But yours is the first report of an issue there,
> > so I'm inclined to wait for more reports (which should come flooding in
> > now you mention it!), and input from those with a better grasp than I
> > of how vmscan pans out in practice (Andrew, Nick, Con spring to mind).
>
>
> Just want to add, that there'd be little point in changing that back
> to a trylock, if vmscan ends up cycling hopelessly around a larger
> loop - though if the larger loop is more preemptible, that's a plus.

Yeah - I'm not sure why a trylock would perform better. If it is just
one big address space, and memory needs to be freed, presumably the
scanner will just choose a different page, and try the lock again.

Feel like doing a few more quick tests Nikita? ;)
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