Re: VM Requirement Document - v0.0

From: Daniel Phillips (
Date: Thu Jul 05 2001 - 10:04:00 EST

On Thursday 05 July 2001 16:00, Xavier Bestel wrote:
> On 05 Jul 2001 15:02:51 +0200, Daniel Phillips wrote:
> > Here's an idea I just came up with while I was composing this... along
> > the lines of using unused bandwidth for something that at least has a
> > chance of being useful. Suppose we come to the end of a period of
> > activity, the general 'temperature' starts to drop and disks fall idle.
> > At this point we could consult a history of which currently running
> > processes have been historically active and grow their working sets by
> > reading in from disk. Otherwise, the memory and the disk bandwidth is
> > just wasted, right? This we can do inside the kernel and not require
> > coders to mess up their apps with hints. Of course, they should still
> > take the time to reengineer them to reduce the cache footprint.
> Well, on a laptop memory and disk bandwith are rarely wasted - they cost
> battery life.

Let me comment on this again, having spent a couple of minutes more
thinking about it. Would you be happy paying 1% of your battery life to get
80% less sluggish response after a memory pig exits?

Also, notice that the scenario we were originally discussing, the off-hours
updatedb, doesn't normally happen on laptops because they tend to be
suspended at that time.

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This archive was generated by hypermail 2b29 : Sat Jul 07 2001 - 21:00:16 EST