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From: Tejun Heo <tj@kernel.org>
To: Christian Loehle <christian.loehle@arm.com>
Cc: sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org, void@manifault.com,
	arighi@nvidia.com, changwoo@igalia.com, mingo@redhat.com,
	peterz@infradead.org, shuah@kernel.org, dietmar.eggemann@arm.com,
	emil@etsalapatis.com
Subject: Re: [PATCH 1/2] sched_ext: Prevent SCX_KICK_WAIT deadlock by serialization
Date: Sat, 28 Mar 2026 14:20:42 -1000	[thread overview]
Message-ID: <cf8ef7e34ed7748699a9af01f9122bf1@kernel.org> (raw)
In-Reply-To: <20260316100249.1651641-1-christian.loehle@arm.com>

Hello,

I posted an alternative fix here:

  https://lore.kernel.org/r/20260329001856.835643-1-tj@kernel.org

Instead of serializing the kicks, it defers the wait to a balance callback
which can drop the rq lock and enable IRQs, avoiding the deadlock while
preserving the concurrent kick_wait semantics.

Thanks.

--
tejun

      parent reply	other threads:[~2026-03-29  0:20 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-16 10:02 [PATCH 0/2] sched_ext: Fix SCX_KICK_WAIT cycle deadlock Christian Loehle
2026-03-16 10:02 ` [PATCH 1/2] sched_ext: Prevent SCX_KICK_WAIT deadlock by serialization Christian Loehle
2026-03-16 10:49   ` Andrea Righi
2026-03-16 11:12     ` Christian Loehle
2026-03-16 14:42       ` Andrea Righi
2026-03-16 17:46   ` Tejun Heo
2026-03-16 22:26     ` Christian Loehle
2026-03-17  8:23       ` Christian Loehle
2026-03-17  9:15         ` Christian Loehle
2026-03-16 10:02 ` [PATCH 2/2] sched_ext/selftests: Add SCX_KICK_WAIT cycle tests Christian Loehle
2026-03-29  0:20 ` Tejun Heo [this message]

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