linux-kernel - Re: [RFC PATCH 0/6] x86/mm: Flush remote and local TLBs concurrently

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Message-ID: <20190527082836.GQ2623@hirez.programming.kicks-ass.net>
Date:   Mon, 27 May 2019 10:28:36 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nadav Amit <namit@...are.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 0/6] x86/mm: Flush remote and local TLBs concurrently

On Sat, May 25, 2019 at 01:21:57AM -0700, Nadav Amit wrote:
> The proposed changes should also improve the performance of other
> invocations of on_each_cpu(). Hopefully, no one has relied on the
> behavior of on_each_cpu() that functions were first executed remotely
> and only then locally.

Oh gawd... I actually have vague memories of code doing exactly that,
but I can't for the life of me remember where :/: