Re: [PATCH -mm] vmscan: protect a fraction of file backed mappedpages from reclaim

[Rik van Riel]

Christoph Lameter wrote:
> On Tue, 12 May 2009, Rik van Riel wrote:
>
> > > Streaming I/O means access once?
> > Yeah, "used-once pages" would be a better criteria, since
> > you could go through a gigantic set of used-once pages without
> > doing linear IO.
>
> Can we see some load for which this patch has a beneficial effect?
> With some numbers?

How many do you want before you're satisfied that this
benefits a significant number of workloads?

How many numbers do you want to feel safe that no workloads
suffer badly from this patch?

Also, wow would you measure a concept as nebulous as desktop
interactivity?

Btw, the patch has gone into the Fedora kernel RPM to get
a good amount of user testing.  I'll let you know what the
users say (if anything).

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