linux-kernel - Re: [PATCH 2/2] sched_ext: Fix missing rq lock in scx_bpf_cpuperf

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Message-ID: <aAaW2qQDg4KXUWwl@slm.duckdns.org>
Date: Mon, 21 Apr 2025 09:04:58 -1000
From: Tejun Heo <tj@...nel.org>
To: Changwoo Min <changwoo@...lia.com>
Cc: Andrea Righi <arighi@...dia.com>, David Vernet <void@...ifault.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] sched_ext: Fix missing rq lock in
 scx_bpf_cpuperf_set()

On Mon, Apr 21, 2025 at 04:44:02PM +0900, Changwoo Min wrote:
> Considering almost all chext_ext ops hold an rq lock, the actual ops
> where scx_bpf_cpuperf_set() for a remote CPU is possible will be very
> limited. When there are more use cases for remote CPU kfuncs calls, I
> think we need to come up with some mechanism, for example, extending
> schedule_deferred() to cover more actions.

Oh yeah, the deferring mechanism was designed to host things like this. It
shouldn't be too difficult to expand to cover it.

Thanks.

-- 
tejun