From: Peter Zijlstra <peterz@infradead.org>
To: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: John Stultz <jstultz@google.com>,
mingo@kernel.org, juri.lelli@redhat.com,
vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
vschneid@redhat.com, linux-kernel@vger.kernel.org,
wangtao554@huawei.com, quzicheng@huawei.com, dsmythies@telus.net,
shubhang@os.amperecomputing.com,
Suleiman Souhlal <suleiman@google.com>
Subject: Re: [PATCH v2 1/7] sched/fair: Fix zero_vruntime tracking
Date: Tue, 31 Mar 2026 11:29:09 +0200 [thread overview]
Message-ID: <20260331092909.GQ3738010@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <19667aac-99c4-40cf-bc0a-b1e6b9d32ede@amd.com>
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.
next prev parent reply other threads:[~2026-03-31 9:29 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-19 7:58 [PATCH v2 0/7] sched: Various reweight_entity() fixes Peter Zijlstra
2026-02-19 7:58 ` [PATCH v2 1/7] sched/fair: Fix zero_vruntime tracking Peter Zijlstra
2026-02-23 10:56 ` Vincent Guittot
2026-02-23 13:09 ` Dietmar Eggemann
2026-02-23 14:15 ` Peter Zijlstra
2026-02-24 8:53 ` Dietmar Eggemann
2026-02-24 9:02 ` Peter Zijlstra
2026-03-28 5:44 ` John Stultz
2026-03-28 17:04 ` Steven Rostedt
2026-03-30 17:58 ` John Stultz
2026-03-30 18:27 ` Steven Rostedt
2026-03-30 9:43 ` Peter Zijlstra
2026-03-30 17:49 ` John Stultz
2026-03-30 10:10 ` Peter Zijlstra
2026-03-30 14:37 ` K Prateek Nayak
2026-03-30 14:40 ` Peter Zijlstra
2026-03-30 15:50 ` K Prateek Nayak
2026-03-30 19:11 ` Peter Zijlstra
2026-03-31 0:38 ` K Prateek Nayak
2026-03-31 4:58 ` K Prateek Nayak
2026-03-31 7:08 ` Peter Zijlstra
2026-03-31 7:14 ` Peter Zijlstra
2026-03-31 8:49 ` K Prateek Nayak
2026-03-31 9:29 ` Peter Zijlstra [this message]
2026-03-31 12:20 ` Peter Zijlstra
2026-03-31 16:14 ` Peter Zijlstra
2026-03-31 17:02 ` K Prateek Nayak
2026-03-31 22:40 ` John Stultz
2026-03-30 19:40 ` John Stultz
2026-03-30 19:43 ` Peter Zijlstra
2026-03-30 21:45 ` John Stultz
2026-02-19 7:58 ` [PATCH v2 2/7] sched/fair: Only set slice protection at pick time Peter Zijlstra
2026-02-19 7:58 ` [PATCH v2 3/7] sched/eevdf: Update se->vprot in reweight_entity() Peter Zijlstra
2026-02-19 7:58 ` [PATCH v2 4/7] sched/fair: Fix lag clamp Peter Zijlstra
2026-02-23 10:23 ` Dietmar Eggemann
2026-02-23 10:57 ` Vincent Guittot
2026-02-19 7:58 ` [PATCH v2 5/7] sched/fair: Increase weight bits for avg_vruntime Peter Zijlstra
2026-02-23 10:56 ` Vincent Guittot
2026-02-23 11:51 ` Peter Zijlstra
2026-02-23 12:36 ` Peter Zijlstra
2026-02-23 13:06 ` Vincent Guittot
2026-03-30 7:55 ` K Prateek Nayak
2026-03-30 9:27 ` Peter Zijlstra
2026-04-02 5:28 ` K Prateek Nayak
2026-04-02 10:22 ` Peter Zijlstra
2026-04-02 10:56 ` K Prateek Nayak
2026-04-03 4:02 ` K Prateek Nayak
2026-04-07 12:00 ` Peter Zijlstra
2026-04-07 13:42 ` [tip: sched/core] sched/fair: Avoid overflow in enqueue_entity() tip-bot2 for K Prateek Nayak
2026-02-19 7:58 ` [PATCH v2 6/7] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag") Peter Zijlstra
2026-02-23 10:57 ` Vincent Guittot
2026-03-24 10:01 ` William Montaz
2026-04-07 13:45 ` Peter Zijlstra
2026-02-19 7:58 ` [PATCH v2 7/7] sched/fair: Use full weight to __calc_delta() Peter Zijlstra
2026-02-23 10:57 ` Vincent Guittot
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