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From: Tejun Heo <tj@kernel.org>
To: Christian Loehle <christian.loehle@arm.com>
Cc: arighi@nvidia.com, void@manifault.com,
	linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev,
	changwoo@igalia.com, hodgesd@meta.com, mingo@redhat.com,
	peterz@infradead.org
Subject: Re: [PATCH v3 2/3] sched_ext: Provide scx_bpf_task_acquire_remote_curr()
Date: Sat, 9 Aug 2025 09:01:18 -1000	[thread overview]
Message-ID: <aJea_sEq9pRWgShm@slm.duckdns.org> (raw)
In-Reply-To: <20250805111036.130121-3-christian.loehle@arm.com>

On Tue, Aug 05, 2025 at 12:10:35PM +0100, Christian Loehle wrote:
> Provide scx_bpf_task_acquire_remote_curr() as a way for scx schedulers
> to check the curr task of a remote rq without assuming its lock is
> held.
> 
> Many scx schedulers make use of scx_bpf_cpu_rq() to check a remote curr
> (e.g. to see if it should be preempted). This is problematic because
> scx_bpf_cpu_rq() provides access to all fields of struct rq, most of
> which aren't safe to use without holding the associated rq lock.
> 
> Signed-off-by: Christian Loehle <christian.loehle@arm.com>

Applied 1-2 to sched_ext/for-6.17-fixes.

Thanks.

-- 
tejun

  reply	other threads:[~2025-08-09 19:01 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-05 11:10 [PATCH v3 0/3] sched_ext: Harden scx_bpf_cpu_rq() Christian Loehle
2025-08-05 11:10 ` [PATCH v3 1/3] sched_ext: Mark scx_bpf_cpu_rq as NULL returnable Christian Loehle
2025-08-05 11:10 ` [PATCH v3 2/3] sched_ext: Provide scx_bpf_task_acquire_remote_curr() Christian Loehle
2025-08-09 19:01   ` Tejun Heo [this message]
2025-08-11 17:08     ` Tejun Heo
2025-08-05 11:10 ` [PATCH v3 3/3] sched_ext: Guarantee rq lock on scx_bpf_cpu_rq() Christian Loehle
2025-08-09 19:03   ` Tejun Heo
2025-08-10 10:52     ` Andrea Righi
2025-08-10 22:18       ` Christian Loehle
2025-08-11 16:52         ` Tejun Heo
2025-08-11 14:35       ` Jake Hillion
2025-08-11 16:51         ` Tejun Heo
2025-08-12 13:31         ` Andrea Righi
2025-08-05 14:33 ` [PATCH v3 0/3] sched_ext: Harden scx_bpf_cpu_rq() Andrea Righi

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