Re: [PATCH v2 4/6] KVM-GST: KVM Steal time registration

Peter Zijlstra
2011-02-01T16:16:17Z

On Tue, 2011-02-01 at 13:53 -0200, Glauber Costa wrote:
>
> And since the granularity of the cpu accounting is too coarse, we end up
> with much more steal time than we should, because things that are less
> than 1 unity of cputime, are often rounded up to 1 unity of cputime.

See, that! is the problem, don't round up like that.

What you can do is: steal_ticks = steal_time_clock() / TICK_NSEC, or
simply keep a steal time delta and every time it overflows
cputime_one_jiffy insert a steal-time tick.

Venki might have created some infrastructure for doing this with the
IRQ_TIME accounting mess, but irqtime_account_process_tick() still gives
me a head-ache.