Hi Tim,
On Wed, 2007-07-11 at 15:37 -0700, Tim Pepper wrote:
> On 7/9/07, Peter Zijlstra <[email protected]> wrote:
> > Use the read-ahead code to provide hints to page reclaim.
> >
> > This patch has the potential to solve the streaming-IO trashes my
> > desktop problem.
> >
> > It tries to aggressively reclaim pages that were loaded in a strong
> > sequential pattern and have been consumed. Thereby limiting the damage
> > to the current resident set.
>
> Interesting...
>
> Would it make sense to tie this into (finally) making
> POSIX_FADV_NOREUSE something more than a noop?
We talked about that, but the thing is, if we make the functionality
conditional, nobody will ever use it :-/
So, yes, in a perfect world that would indeed make sense. However since
nobody ever uses these [fm]advise calls,..
So the big question is, does this functionally hurt any workload? If it
turns out it does (which I still doubt) then we might hide it behind
knobs, otherwise I'd like to keep it always on.
Peter
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