From: Tejun Heo <tj@kernel.org>
To: Andrea Righi <arighi@nvidia.com>
Cc: David Vernet <void@manifault.com>,
Changwoo Min <changwoo@igalia.com>,
John Stultz <jstultz@google.com>, Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
K Prateek Nayak <kprateek.nayak@amd.com>,
Christian Loehle <christian.loehle@arm.com>,
David Dai <david.dai@linux.dev>, Koba Ko <kobak@nvidia.com>,
Aiqun Yu <aiqun.yu@oss.qualcomm.com>,
sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 14/17] sched_ext: Delegate proxy donor admission to BPF schedulers
Date: Mon, 17 Aug 2026 10:24:29 -1000 [thread overview]
Message-ID: <aoNt_Rhdwl0NCFOJ@slm.duckdns.org> (raw)
In-Reply-To: <aoNawphy4OVGU4ex@gpd4>
Hello,
On Mon, Aug 17, 2026 at 09:02:26PM +0200, Andrea Righi wrote:
...
> So there are 3 cases:
> - task_proxy_move_active() prevents moving a donor that is currently running or
> donating,
> - task_cpu(D) != D->wake_cpu prevents moving an inactive donor whose scheduling
> context has already been moved to its owner's CPU by proxy exec,
> - an inactive donor that has not yet been proxy-migrated remains under BPF
> placement control.
I think this mostly stems from my not understanding the full picture, so
while proxy execution is in progress - the donor's context is running the
owner - the execution cannot leave the owner's last CPU? That *seems* to be
the behavior assumed by the core code. It's a bit odd that the owner becomes
essentially CPU-pinned.
Thanks.
--
tejun
next prev parent reply other threads:[~2026-08-17 20:24 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-16 17:34 [PATCHSET v12 sched_ext/for-7.3] sched: Make proxy execution compatible with sched_ext Andrea Righi
2026-08-16 17:34 ` [PATCH 01/17] sched/core: Drop mutex locks before proxy rescheduling Andrea Righi
2026-08-16 17:35 ` [PATCH 02/17] sched/core: Dequeue waking proxy donors before reset Andrea Righi
2026-08-16 20:20 ` Tejun Heo
2026-08-16 21:56 ` [PATCH v2] " Andrea Righi
2026-08-16 17:35 ` [PATCH 03/17] sched: Make NOHZ CFS bandwidth checks follow proxy donor Andrea Righi
2026-08-16 17:35 ` [PATCH 04/17] sched/core: Avoid false migration warning for proxy donors Andrea Righi
2026-08-16 17:35 ` [PATCH 05/17] sched: Pass next class to sched_change_begin() Andrea Righi
2026-08-16 17:35 ` [PATCH 06/17] sched: Add helper to block retained proxy donors Andrea Righi
2026-08-16 17:35 ` [PATCH 07/17] sched: Add sched_ext hooks for proxy execution Andrea Righi
2026-08-16 17:35 ` [PATCH 08/17] sched_ext: Block proxy donors across scheduler transitions Andrea Righi
2026-08-16 21:32 ` Tejun Heo
2026-08-16 22:06 ` Andrea Righi
2026-08-16 17:35 ` [PATCH 09/17] sched_ext: Fix ops.running/stopping() pairing for proxy-exec donors Andrea Righi
2026-08-16 22:10 ` Tejun Heo
2026-08-16 22:21 ` Andrea Righi
2026-08-16 22:29 ` [PATCH v2] " Andrea Righi
2026-08-16 17:35 ` [PATCH 10/17] sched_ext: Move reject DSQ draining into core Andrea Righi
2026-08-16 17:35 ` [PATCH 11/17] sched_ext: Generalize the reject DSQ reenqueue path Andrea Righi
2026-08-16 22:45 ` Tejun Heo
2026-08-17 6:29 ` Andrea Righi
2026-08-16 17:35 ` [PATCH 12/17] sched_ext: Handle proxy-exec races in remote DSQ transfers Andrea Righi
2026-08-16 23:54 ` Tejun Heo
2026-08-17 7:15 ` Andrea Righi
2026-08-17 17:17 ` Tejun Heo
2026-08-17 19:32 ` Andrea Righi
2026-08-17 19:49 ` Tejun Heo
2026-08-16 17:35 ` [PATCH 13/17] sched_ext: Split curr|donor references properly Andrea Righi
2026-08-16 17:35 ` [PATCH 14/17] sched_ext: Delegate proxy donor admission to BPF schedulers Andrea Righi
2026-08-17 3:02 ` Tejun Heo
2026-08-17 19:02 ` Andrea Righi
2026-08-17 20:24 ` Tejun Heo [this message]
2026-08-16 17:35 ` [PATCH 15/17] sched_ext: Add selftest for blocked donor admission Andrea Righi
2026-08-16 17:35 ` [PATCH 16/17] sched_ext: scx_qmap: Add proxy execution support Andrea Righi
2026-08-16 17:35 ` [PATCH 17/17] sched: Allow enabling proxy exec with sched_ext Andrea Righi
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