Re: [bug-report] possible s64 overflow in max_vruntime()

[Peter Zijlstra]

On Thu, Jan 26, 2023 at 07:31:02PM +0100, Roman Kagan wrote:

> > All that only matters for small sleeps anyway.
> > 
> > Something like:
> > 
> >         sleep_time = U64_MAX;
> >         if (se->avg.last_update_time)
> >           sleep_time = cfs_rq_clock_pelt(cfs_rq) - se->avg.last_update_time;
> 
> Interesting, why not rq_clock_task(rq_of(cfs_rq)) - se->exec_start, as
> others were suggesting?  It appears to better match the notion of sleep
> wall-time, no?

Should also work I suppose. cfs_rq_clock takes throttling into account,
but that should hopefully also not be *that* long, so either should
work.