linux-kernel - Re: [PATCH v2 1/4] sched/task: Add the put_task_struct_atomic

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Message-ID: <8632d9c6-7ec7-c3aa-f9e7-fa63cc82f6ae@redhat.com>
Date:   Fri, 17 Feb 2023 14:35:22 -0300
From:   Daniel Bristot de Oliveira <bristot@...hat.com>
To:     Wander Lairson Costa <wander@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Luca Abeni <luca.abeni@...tannapisa.it>
Cc:     Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Stafford Horne <shorne@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Andrei Vagin <avagin@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        Paul McKenney <paulmck@...nel.org>
Subject: Re: [PATCH v2 1/4] sched/task: Add the put_task_struct_atomic_safe
 function

On 1/30/23 08:49, Wander Lairson Costa wrote:
>> Another thing, if you look at release_task_stack(), it either caches the
>> outgoing stack for later use, or frees it via RCU (regardless of
>> PREEMPT_RT). Perhaps we could follow that and just always punt the freeing
>> of the task struct to RCU?
>>
> That's a point. Do you mean doing that even for !PREEMPT_RT?
> 

It seems that Luca Abeni (in Cc) is hitting the bug in the non-rt kernel
with SCHED_DEADLINE...

adding him to the thread.

-- Daniel