Hi Tim,
On Wed, 2007-07-11 at 15:37 -0700, Tim Pepper wrote:On 7/9/07, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:Use the read-ahead code to provide hints to page reclaim.Interesting...
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.
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.