Messages in this thread | | | Date | Thu, 14 May 2009 16:14:31 -0400 (EDT) | From | Christoph Lameter <> | Subject | Re: [PATCH -mm] vmscan: protect a fraction of file backed mapped pages from reclaim |
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On Wed, 13 May 2009, KOSAKI Motohiro wrote:
> > All these expiration modifications do not take into account that a desktop > > may sit idle for hours while some other things run in the background (like > > backups at night or updatedb and other maintenance things). This still > > means that the desktop will be usuable in the morning. > > Have you seen this phenomenom? > I always use linux desktop for development. but I haven't seen it. > perhaps I have no luck. I really want to know reproduce way. > > Please let me know reproduce way.
Run a backup (or rsync) over a few hundred GB.
> > 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.
> key point is access-once vs access-many.
Nothing against it if it works.
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