From: Andrea Righi <arighi@nvidia.com>
To: Tejun Heo <tj@kernel.org>
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>,
Shuah Khan <shuah@kernel.org>,
sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 14/15] sched_ext: scx_qmap: Add proxy execution support
Date: Thu, 6 Aug 2026 09:28:12 +0200 [thread overview]
Message-ID: <anQ3jK53Pb0JFoc8@gpd4> (raw)
In-Reply-To: <anEUoyw_JnTpUQZZ@slm.duckdns.org>
On Mon, Aug 03, 2026 at 12:22:27PM -1000, Tejun Heo wrote:
> On Tue, Jul 28, 2026 at 05:43:32PM +0200, Andrea Righi wrote:
> > + * A blocked donor rejected by a local DSQ must not be dispatched back
> > + * to the same DSQ immediately. Move it to the global DSQ so another CPU
> > + * can pick it up and kick an idle cid to accelerate its consumption.
>
> My mental picture isn't complete. Can you expand on why this block is
> necessary?
This was intended to support SCX_OPS_ALWAYS_ENQ_IMMED. A blocked donor is
inserted into a local DSQ, but if the donor can't run immediately, it goes back
to ops.enqueue() when ENQ_IMMED is set. Maybe we can move this condition in the
main SCX_ENQ_REENQ block at the top (explaining this special case with proxy
exec)?
-Andrea
next prev parent reply other threads:[~2026-08-06 7:28 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-28 15:43 [PATCHSET v10 sched_ext/for-7.3] sched: Make proxy execution compatible with sched_ext Andrea Righi
2026-07-28 15:43 ` [PATCH 01/15] sched/core: Avoid false migration warning for proxy donors Andrea Righi
2026-07-28 15:43 ` [PATCH 02/15] sched: Make NOHZ CFS bandwidth checks follow proxy donor Andrea Righi
2026-07-28 15:43 ` [PATCH 03/15] sched: Add helper to block retained proxy donors Andrea Righi
2026-07-28 15:43 ` [PATCH 04/15] sched: Skip class callbacks with SCHED_FLAG_KEEP_PARAMS Andrea Righi
2026-07-28 16:03 ` sashiko-bot
2026-07-28 15:43 ` [PATCH 05/15] sched: Add prepare_switch() class callback Andrea Righi
2026-07-28 15:43 ` [PATCH 06/15] sched: Add sched_ext hooks for proxy execution Andrea Righi
2026-07-28 15:43 ` [PATCH 07/15] sched_ext: Block proxy donors across scheduler transitions Andrea Righi
2026-08-03 20:36 ` Tejun Heo
2026-08-05 7:02 ` Andrea Righi
2026-08-06 9:07 ` Andrea Righi
2026-07-28 15:43 ` [PATCH 08/15] sched_ext: Fix ops.running/stopping() pairing for proxy-exec donors Andrea Righi
2026-07-28 15:43 ` [PATCH 09/15] sched_ext: Generalize the reject DSQ reenqueue path Andrea Righi
2026-07-28 16:00 ` sashiko-bot
2026-08-03 20:35 ` Tejun Heo
2026-08-03 20:38 ` Tejun Heo
2026-08-05 8:50 ` Andrea Righi
2026-07-28 15:43 ` [PATCH 10/15] sched_ext: Handle proxy-exec races in remote DSQ transfers Andrea Righi
2026-08-03 21:36 ` Tejun Heo
2026-08-05 16:44 ` Andrea Righi
2026-07-28 15:43 ` [PATCH 11/15] sched_ext: Split curr|donor references properly Andrea Righi
2026-07-28 16:25 ` sashiko-bot
2026-07-28 15:43 ` [PATCH 12/15] sched_ext: Delegate proxy donor admission to BPF schedulers Andrea Righi
2026-08-03 22:18 ` Tejun Heo
2026-08-06 6:10 ` Andrea Righi
2026-07-28 15:43 ` [PATCH 13/15] sched_ext: Add selftest for blocked donor admission Andrea Righi
2026-07-28 15:43 ` [PATCH 14/15] sched_ext: scx_qmap: Add proxy execution support Andrea Righi
2026-08-03 22:22 ` Tejun Heo
2026-08-06 7:28 ` Andrea Righi [this message]
2026-07-28 15:43 ` [PATCH 15/15] sched: Allow enabling proxy exec with sched_ext Andrea Righi
2026-08-03 22:19 ` Tejun Heo
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