[PATCH v4] KVM: PPC Use clockevent multiplier and shifter for decrementer

[Alexander Graf]

On 18.04.2012, at 18:01, Bharat Bhushan wrote:

> Time for which the hrtimer is started for decrementer emulation is calculated using tb_ticks_per_usec. While hrtimer uses the clockevent for DEC reprogramming (if needed) and which calculate timebase ticks using the multiplier and shifter mechanism implemented within clockevent layer. It was observed that this conversion (timebase->time->timebase) are not correct because the mechanism are not consistent. In our setup it adds 2% jitter.
> 
> With this patch clockevent multiplier and shifter mechanism are used when starting hrtimer for decrementer emulation. Now the jitter is < 0.5%.
> 
> Signed-off-by: Bharat Bhushan <bharat.bhushan at freescale.com>

Thanks, applied to kvm-ppc-next with fixed commit message and fixed trailing whitespace :).


Alex