linux-kernel - Re: Some -serious- BPF-related litmus tests

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Message-ID: <20200522094407.GK325280@hirez.programming.kicks-ass.net>
Date:   Fri, 22 May 2020 11:44:07 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     stern@...land.harvard.edu, parri.andrea@...il.com, will@...nel.org,
        boqun.feng@...il.com, npiggin@...il.com, dhowells@...hat.com,
        j.alglave@....ac.uk, luc.maranget@...ia.fr, akiyks@...il.com,
        dlustig@...dia.com, joel@...lfernandes.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        andriin@...com
Subject: Re: Some -serious- BPF-related litmus tests

On Thu, May 21, 2020 at 05:38:50PM -0700, Paul E. McKenney wrote:
> Hello!
> 
> Just wanted to call your attention to some pretty cool and pretty serious
> litmus tests that Andrii did as part of his BPF ring-buffer work:
> 
> https://lore.kernel.org/bpf/20200517195727.279322-3-andriin@fb.com/
> 
> Thoughts?

I find:

	smp_wmb()
	smp_store_release()

a _very_ weird construct. What is that supposed to even do?