Re: [PATCH v2 1/7] sched/fair: Fix zero_vruntime tracking

[Peter Zijlstra]

On Tue, Mar 31, 2026 at 02:19:54PM +0530, K Prateek Nayak wrote:
> On 3/31/2026 12:44 PM, Peter Zijlstra wrote:
> > On Tue, Mar 31, 2026 at 09:08:23AM +0200, Peter Zijlstra wrote:
> >> On Tue, Mar 31, 2026 at 06:08:27AM +0530, K Prateek Nayak wrote:
> >>
> >>> The above doesn't recover after a avg_vruntime(). Btw I'm running:
> >>>
> >>>     nice -n 19 stress-ng --yield 32 -t 1000000s&
> >>>     while true; do perf bench sched messaging -p -t -l 100000 -g 16; done
> >>
> >> And you're running that on a 16 cpu machine / vm ?
> > 
> > W00t, it went b00m. Ok, let me go add some tracing.
> 
> I could only repro it on baremetal after few hours but good to know it
> exploded effortlessly on your end! Was this a 16vCPU VM with the same
> recipe?

Yep. It almost insta triggers. Trying to make sense of the traces now.