From: Peter Zijlstra <peterz@infradead.org>
To: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: John Stultz <jstultz@google.com>,
LKML <linux-kernel@vger.kernel.org>,
Joel Fernandes <joelagnelf@nvidia.com>,
Qais Yousef <qyousef@layalina.io>, Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Valentin Schneider <vschneid@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>,
Zimuzo Ezeozue <zezeozue@google.com>,
Mel Gorman <mgorman@suse.de>, Will Deacon <will@kernel.org>,
Waiman Long <longman@redhat.com>,
Boqun Feng <boqun.feng@gmail.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Metin Kaya <Metin.Kaya@arm.com>,
Xuewen Yan <xuewen.yan94@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Suleiman Souhlal <suleiman@google.com>,
kuyo chang <kuyo.chang@mediatek.com>, hupu <hupu.gm@gmail.com>,
kernel-team@android.com
Subject: Re: [PATCH v26 00/10] Simple Donor Migration for Proxy Execution
Date: Fri, 3 Apr 2026 23:08:04 +0200 [thread overview]
Message-ID: <20260403210804.GE2872@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <0f5b0dd9-ef6e-462b-ac89-6f37c4261241@amd.com>
On Fri, Apr 03, 2026 at 09:09:31PM +0530, K Prateek Nayak wrote:
> > + /*
> > + * We're being taken off the runqueue, cannot still be blocked_on
> > + * anything. This also means that delay_dequeue can not have
> > + * blocked_on.
> > + */
> > + clear_task_blocked_on(p, NULL);
> > +
>
> Oh! I remember why we couldn't do this - if we clear the
> "blocked_on" via proxy_deactivate(), we might be delayed on
> the owner's CPU *outside* of the task's affinity.
>
> In that case, we don't want to re-enqueue it there since it'll
> violate affinity and the "blocked_on" relation forces it down
> the sched_proxy_exec() path in ttwu_runnable() which will fix
> it via a full wakeup.
Ah indeed.
next prev parent reply other threads:[~2026-04-03 21:08 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-24 19:13 [PATCH v26 00/10] Simple Donor Migration for Proxy Execution John Stultz
2026-03-24 19:13 ` [PATCH v26 01/10] sched: Make class_schedulers avoid pushing current, and get rid of proxy_tag_curr() John Stultz
2026-04-03 12:30 ` [tip: sched/core] " tip-bot2 for John Stultz
2026-03-24 19:13 ` [PATCH v26 02/10] sched: Minimise repeated sched_proxy_exec() checking John Stultz
2026-04-03 12:30 ` [tip: sched/core] " tip-bot2 for John Stultz
2026-03-24 19:13 ` [PATCH v26 03/10] sched: Fix potentially missing balancing with Proxy Exec John Stultz
2026-04-03 12:30 ` [tip: sched/core] " tip-bot2 for John Stultz
2026-03-24 19:13 ` [PATCH v26 04/10] locking: Add task::blocked_lock to serialize blocked_on state John Stultz
2026-04-03 12:30 ` [tip: sched/core] " tip-bot2 for John Stultz
2026-03-24 19:13 ` [PATCH v26 05/10] sched: Fix modifying donor->blocked on without proper locking John Stultz
2026-03-26 21:45 ` Steven Rostedt
2026-04-03 12:30 ` [tip: sched/core] " tip-bot2 for John Stultz
2026-03-24 19:13 ` [PATCH v26 06/10] sched/locking: Add special p->blocked_on==PROXY_WAKING value for proxy return-migration John Stultz
2026-04-03 12:30 ` [tip: sched/core] " tip-bot2 for John Stultz
2026-03-24 19:13 ` [PATCH v26 07/10] sched: Add assert_balance_callbacks_empty helper John Stultz
2026-04-03 12:30 ` [tip: sched/core] " tip-bot2 for John Stultz
2026-03-24 19:13 ` [PATCH v26 08/10] sched: Add logic to zap balance callbacks if we pick again John Stultz
2026-04-03 12:30 ` [tip: sched/core] " tip-bot2 for John Stultz
2026-03-24 19:13 ` [PATCH v26 09/10] sched: Move attach_one_task and attach_task helpers to sched.h John Stultz
2026-04-03 12:30 ` [tip: sched/core] " tip-bot2 for John Stultz
2026-03-24 19:13 ` [PATCH v26 10/10] sched: Handle blocked-waiter migration (and return migration) John Stultz
2026-03-26 22:52 ` Steven Rostedt
2026-03-27 4:47 ` K Prateek Nayak
2026-03-27 12:47 ` Peter Zijlstra
2026-04-02 14:43 ` Peter Zijlstra
2026-04-02 15:08 ` Peter Zijlstra
2026-04-02 17:43 ` John Stultz
2026-04-02 17:34 ` John Stultz
2026-04-03 12:30 ` [tip: sched/core] " tip-bot2 for John Stultz
2026-03-25 10:52 ` [PATCH v26 00/10] Simple Donor Migration for Proxy Execution K Prateek Nayak
2026-03-27 11:48 ` Peter Zijlstra
2026-03-27 13:33 ` K Prateek Nayak
2026-03-27 15:20 ` Peter Zijlstra
2026-03-27 15:41 ` Peter Zijlstra
2026-03-27 16:00 ` Peter Zijlstra
2026-03-27 16:57 ` K Prateek Nayak
2026-04-02 15:50 ` Peter Zijlstra
2026-04-02 18:31 ` John Stultz
2026-04-02 21:04 ` John Stultz
2026-04-03 6:09 ` K Prateek Nayak
2026-04-03 9:52 ` Peter Zijlstra
2026-04-03 10:25 ` K Prateek Nayak
2026-04-03 11:28 ` Peter Zijlstra
2026-04-03 13:43 ` K Prateek Nayak
2026-04-03 14:38 ` Peter Zijlstra
2026-04-03 15:39 ` K Prateek Nayak
2026-04-03 21:08 ` Peter Zijlstra [this message]
2026-04-04 0:26 ` John Stultz
2026-04-04 5:49 ` K Prateek Nayak
2026-04-04 6:07 ` John Stultz
2026-04-06 2:40 ` K Prateek Nayak
2026-04-03 12:54 ` Peter Zijlstra
2026-04-03 9:18 ` Peter Zijlstra
2026-03-27 19:15 ` John Stultz
2026-03-27 19:10 ` John Stultz
2026-03-28 4:53 ` K Prateek Nayak
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