Re: [Qemu-devel] [PATCH] Timer/clock for Linux

[Paul Brook]

On Wednesday 26 April 2006 14:01, Jamie Lokier wrote:
> Paul Brook wrote:
> > One solution (which is also desirable for other reasons) is to
> > implement some form of guest cycle counting based on the
> > instructions actually executed.  Then use that as the high-precision
> > timesource, and use some for of adaptive method to keep host and
> > guest clocks in sync.
>
> That's what I meant, expressed more clearly, except that I meant to
> count guest time based on the real time spent executing guest code,
> rather than counting individual instructions.  Thanks!

How do you propose doing that? It implies you have some way of interrupting 
the guest after it has executed a small amount of guest code, where "small" 
is less than the resolution+latency of host timer interrupts.

Paul