linux-kernel - Re: [PATCH v3 2/3] sched_ext: Provide scx_bpf_task_acquire_remote

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Message-ID: <aJea_sEq9pRWgShm@slm.duckdns.org>
Date: Sat, 9 Aug 2025 09:01:18 -1000
From: Tejun Heo <tj@...nel.org>
To: Christian Loehle <christian.loehle@....com>
Cc: arighi@...dia.com, void@...ifault.com, linux-kernel@...r.kernel.org,
	sched-ext@...ts.linux.dev, changwoo@...lia.com, hodgesd@...a.com,
	mingo@...hat.com, peterz@...radead.org
Subject: Re: [PATCH v3 2/3] sched_ext: Provide
 scx_bpf_task_acquire_remote_curr()

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@....com>

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

Thanks.

-- 
tejun