linux-kernel - Re: [PATCH tip/core/rcu 03/17] rcu/tree: Skip entry into the page allocator for PREEMPT

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Date:   Tue, 7 Jul 2020 11:27:07 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Uladzislau Rezki <urezki@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com
Subject: Re: [PATCH tip/core/rcu 03/17] rcu/tree: Skip entry into the page
 allocator for PREEMPT_RT

On 2020-07-06 16:29:49 [-0400], Joel Fernandes wrote:
> Anyway, I think as we discussed on IRC, your proposal will work for both
> kernels while allowing us to keep the internal lock as raw.

Why can't we use the migrate_disable() and spinlock_t?

> thanks,
> 
>  - Joel

Sebastian