From: K Prateek Nayak <kprateek.nayak@amd.com>
To: Peter Zijlstra <peterz@infradead.org>
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 22:32:35 +0530 [thread overview]
Message-ID: <75446011-1612-4c6e-8141-7fc83d1df582@amd.com> (raw)
In-Reply-To: <20260331161443.GA134305@noisy.programming.kicks-ass.net>
On 3/31/2026 9:44 PM, Peter Zijlstra wrote:
> @@ -925,6 +926,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
> if (last)
> right_vruntime = last->vruntime;
> zero_vruntime = cfs_rq->zero_vruntime;
> + avruntime = avg_vruntime(cfs_rq);
> raw_spin_rq_unlock_irqrestore(rq, flags);
Ah! Didn't notice we dropped the lock as soon as we are done reading the
necessary values. Makes sense why reading the debugfs under heavy load
crashed.
Ran 100 loops of reading the debug file while running stress-ng
+ sched-messaging and I haven't see any crashes yet so feel free to
include:
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
>
> SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_deadline",
--
Thanks and Regards,
Prateek
next prev parent reply other threads:[~2026-03-31 17:03 UTC|newest]
Thread overview: 63+ 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
2026-03-31 12:20 ` Peter Zijlstra
2026-03-31 16:14 ` Peter Zijlstra
2026-03-31 17:02 ` K Prateek Nayak [this message]
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
2026-04-15 21:10 ` [PATCH 6.18] " John Stultz
2026-08-10 1:44 ` Jose Fernandez
2026-08-10 7:38 ` Peter Zijlstra
2026-08-10 23:31 ` Jose Fernandez (Anthropic)
2026-08-10 23:38 ` John Stultz
2026-08-10 23:57 ` Sasha Levin
2026-08-11 0:11 ` John Stultz
2026-08-11 18:55 ` Sasha Levin
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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