From: Tejun Heo <tj@kernel.org>
To: Radu Toader <radu.m.toader@gmail.com>
Cc: peterz@infradead.org, mingo@redhat.com, tglx@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,
kprateek.nayak@amd.com, void@manifault.com, arighi@nvidia.com,
changwoo@igalia.com, frederic@kernel.org,
anna-maria@linutronix.de, bigeasy@linutronix.de,
joshdon@google.com, haoluo@google.com, brho@google.com,
linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev,
bpf@vger.kernel.org
Subject: Re: [PATCH 1/2] sched_ext: Add scx_tickbug, a scheduler that holds a task on an idle CPU
Date: Fri, 6 Nov 2026 06:59:50 -1000 [thread overview]
Message-ID: <au4HhnJoKvJ6GPJT@slm.duckdns.org> (raw)
In-Reply-To: <20261106094343.174905-2-radu.m.toader@gmail.com>
Hello,
On Fri, Nov 06, 2026 at 09:43:42AM +0000, Radu Toader wrote:
...
> This scheduler is the same thing with the kick removed: a tagged task
> is parked on the target CPU's run queue and released only by a timer
> pinned to another CPU, so the window is as wide as -H says. Untagged
> tasks go through a shared DSQ and per-CPU kthreads keep their local DSQ
> and preemption, so the machine stays usable and the timer's softirq
> cannot be starved.
Thanks for catching the bug. However, this scheduler is more of an one-off
debug code and I'm not sure we want to carry this in tree. Maybe put it in a
github gist or sth and point to it from the fix patch?
Thanks.
--
tejun
next prev parent reply other threads:[~2026-11-06 16:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-06 9:43 [PATCH 0/2] softirq: fix idle accounting for an interrupted idle task Radu Toader
2026-11-06 9:43 ` [PATCH 1/2] sched_ext: Add scx_tickbug, a scheduler that holds a task on an idle CPU Radu Toader
2026-11-06 16:59 ` Tejun Heo [this message]
2026-11-06 20:10 ` bot+bpf-ci
2026-11-06 9:43 ` [PATCH 2/2] softirq: Treat an interrupted idle task as idle in tick_irq_exit() Radu Toader
2026-11-06 10:23 ` Peter Zijlstra
2026-11-06 19:55 ` bot+bpf-ci
-- strict thread matches above, loose matches on Subject: below --
2026-11-05 20:02 [PATCH 0/2] softirq: fix idle accounting for an interrupted idle task Radu Toader
2026-11-05 20:02 ` [PATCH 1/2] sched_ext: Add scx_tickbug, a scheduler that holds a task on an idle CPU Radu Toader
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