Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Mon, 12 Dec 2022 12:13:31 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Tejun Heo <tj@kernel.org>
Cc:     torvalds@linux-foundation.org, mingo@redhat.com,
        juri.lelli@redhat.com, vincent.guittot@linaro.org,
        dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com,
        mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com,
        ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
        martin.lau@kernel.org, joshdon@google.com, brho@google.com,
        pjt@google.com, derkling@google.com, haoluo@google.com,
        dvernet@meta.com, dschatzberg@meta.com, dskarlat@cs.cmu.edu,
        riel@surriel.com, linux-kernel@vger.kernel.org,
        bpf@vger.kernel.org, kernel-team@meta.com
Subject: Re: [PATCH 04/31] sched: Allow sched_cgroup_fork() to fail and
 introduce sched_cancel_fork()
Message-ID: <Y5cM24M4007WcPod@hirez.programming.kicks-ass.net>
References: <20221130082313.3241517-1-tj@kernel.org>
 <20221130082313.3241517-5-tj@kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20221130082313.3241517-5-tj@kernel.org>
Precedence: bulk

On Tue, Nov 29, 2022 at 10:22:46PM -1000, Tejun Heo wrote:
> A new sched_clas needs a bit more control over forking. This patch makes the
                 ^
                 (insufficient s's)

> following changes:
> 
> * Add sched_cancel_fork() which is called if fork fails after sched_fork()
>   succeeds so that the preparation can be undone.
> 
> * Allow sched_cgroup_fork() to fail.
> 
> Neither is used yet and this patch shouldn't cause any behavior changes.

Fails to explain why this would be needed and why that would be a good
thing. IOW, total lack of justification.