From: "Jose Fernandez (Anthropic)" <jose.fernandez@linux.dev>
To: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <jstultz@google.com>,
stable@vger.kernel.org, linux-kernel@vger.kernel.org,
Sasha Levin <sashal@kernel.org>, Ingo Molnar <mingo@kernel.org>,
Janne Huttunen <janne.huttunen@nokia.com>,
Zicheng Qu <quzicheng@huawei.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
K Prateek Nayak <kprateek.nayak@amd.com>,
Shubhang Kaushik <shubhang@os.amperecomputing.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Xuewen Yan <xuewen.yan@unisoc.com>,
William Montaz <willymontaz@gmail.com>
Subject: Re: [PATCH 6.18] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag")
Date: Mon, 10 Aug 2026 23:31:34 +0000 [thread overview]
Message-ID: <anpfJp_tuKDuePJM@linux.dev> (raw)
In-Reply-To: <20260810073830.GC1642880@noisy.programming.kicks-ass.net>
On Mon, Aug 10, 2026 at 09:38:30AM +0200, Peter Zijlstra wrote:
> Yeah, this should be fine without 4823725d9d1d.
One heads up, our review tooling caught this after I sent the
Tested-by. The revert was written after commit 80390ead2080
("sched/fair: Separate se->vlag from se->vprot") took vlag and vprot
out of their union, and 6.18 still has the union. Without that split
first, the rel_vprot path in the new reweight_entity() scales vlag
twice and curr's vruntime comes out wrong.
next prev parent reply other threads:[~2026-08-10 23:32 UTC|newest]
Thread overview: 62+ 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
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) [this message]
2026-08-10 23:38 ` John Stultz
2026-08-10 23:57 ` Sasha Levin
2026-08-11 0:11 ` John Stultz
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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