Messages in this thread | | | Subject | Re: [PATCH 2/6] lguest tsc fix | From | Rusty Russell <> | Date | Wed, 06 Jun 2007 10:25:49 +1000 |
| |
On Tue, 2007-06-05 at 20:15 +0200, Andi Kleen wrote: > On Wed, Jun 06, 2007 at 12:56:36AM +1000, Rusty Russell wrote: > > In recent -mm kernels, the TSC capability cannot be disabled, > > resulting in a divide by zero error in the normal sched_clock. > > That will hopefully change. I hope hpa will just undo this. > > > > > The correct fix is to have a special lguest sched_clock > > implementation: this is as simple as it gets. > > But gettimeofday might still use it. Is that ok for you?
Yes, I don't think it will be any worse than before. Basically the guest uses a dumb jiffies-based clock. The TSC patch later in this same series changes it back to use the native sched_clock, and overrides tsc_khz instead (based on information from the host).
Thanks, Rusty.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |