linux-kernel - Re: [RFC patch 00/19] bpf: Make BPF and PREEMPT

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Date:   Fri, 14 Feb 2020 09:53:03 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        bigeasy@...utronix.de, peterz@...radead.org, williams@...hat.com,
        rostedt@...dmis.org, juri.lelli@...hat.com, mingo@...nel.org
Subject: Re: [RFC patch 00/19] bpf: Make BPF and PREEMPT_RT co-exist

From: Thomas Gleixner <tglx@...utronix.de>
Date: Fri, 14 Feb 2020 14:39:17 +0100

> This is a follow up to the initial patch series which David posted a
> while ago:
> 
>  https://lore.kernel.org/bpf/20191207.160357.828344895192682546.davem@davemloft.net/
> 
> which was (while non-functional on RT) a good starting point for further
> investigations.

This looks really good after a cursory review, thanks for doing this week.

I was personally unaware of the pre-allocation rules for MAPs used by
tracing et al.  And that definitely shapes how this should be handled.