linux-kernel - Re: [PATCH v2 5/8] perf auxtrace: Change to use SMP memory barriers

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Message-ID: <YL47cyfNBx5OIRNB@hirez.programming.kicks-ass.net>
Date:   Mon, 7 Jun 2021 17:29:55 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 5/8] perf auxtrace: Change to use SMP memory barriers

On Wed, Jun 02, 2021 at 06:30:04PM +0800, Leo Yan wrote:
> The kernel and the userspace tool can access the AUX ring buffer head
> and tail from different CPUs, thus SMP class of barriers are required
> on SMP system.
> 
> This patch changes to use SMP barriers to replace mb() and rmb()
> barriers.
> 
> Signed-off-by: Leo Yan <leo.yan@...aro.org>

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>