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

[Rik van Riel]

KOSAKI Motohiro wrote:

> > > > The percentage of file backed pages protected is set via
> > > > /proc/sys/vm/file_mapped_ratio. This defaults to 20%.
> > > Why do you think typical mapped ratio is less than 20% on desktop machine?
> > Observation of the typical mapped size of Firefox under KDE.
>
> My point is, desktop people have very various mapped ratio.
> Do you oppose this?

I suspect that the mapped ratio could be much higher
on my system.  I have only 2GB of RAM dedicated to my
dom0 (which is also my desktop) and the amount of page
cache often goes down to about 150MB.

At the moment nr_mapped is 26400 and the amount of
memory taken up by buffer and page cache together is
a little over 300MB.  That's close to 50%.

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