Re: [RFC patch 09/19] bpf: Use BPF_PROG_RUN_PIN_ON_CPU() at simple call sites.

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Subject: Re: [RFC patch 09/19] bpf: Use BPF_PROG_RUN_PIN_ON_CPU() at simple call sites.
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Fri, 21 Feb 2020 15:05:12 +0100
Cc: Kees Cook <keescook@xxxxxxxxxxxx>, Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, David Miller <davem@xxxxxxxxxxxxx>, bpf@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, Alexei Starovoitov <ast@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, Sebastian Sewior <bigeasy@xxxxxxxxxxxxx>, Clark Williams <williams@xxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Juri Lelli <juri.lelli@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Will Drewry <wad@xxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>
In-reply-to: <87lfownip5.fsf@nanos.tec.linutronix.de>
User-agent: Mutt/1.10.1 (2018-07-13)

On Fri, Feb 21, 2020 at 03:00:54PM +0100, Thomas Gleixner wrote:
> Of course not. If we'd run the same thread on multiple CPUs in parallel
> the ordering of your BPF programs would be the least of your worries.

Been there, done that. It goes sideways *REALLY* fast :-)

References:
- [RFC patch 00/19] bpf: Make BPF and PREEMPT_RT co-exist
  - From: Thomas Gleixner
- [RFC patch 09/19] bpf: Use BPF_PROG_RUN_PIN_ON_CPU() at simple call sites.
  - From: Thomas Gleixner
- Re: [RFC patch 09/19] bpf: Use BPF_PROG_RUN_PIN_ON_CPU() at simple call sites.
  - From: Vinicius Costa Gomes
- Re: [RFC patch 09/19] bpf: Use BPF_PROG_RUN_PIN_ON_CPU() at simple call sites.
  - From: Thomas Gleixner
- Re: [RFC patch 09/19] bpf: Use BPF_PROG_RUN_PIN_ON_CPU() at simple call sites.
  - From: Kees Cook
- Re: [RFC patch 09/19] bpf: Use BPF_PROG_RUN_PIN_ON_CPU() at simple call sites.
  - From: Thomas Gleixner

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