linux-kernel - Re: [PATCH 03/11] perf/x86: Add support for TSC in nanoseconds as a perf event clock

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Message-ID: <YgO68ihU+ikg4QOa@hirez.programming.kicks-ass.net>
Date:   Wed, 9 Feb 2022 14:00:34 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        kvm@...r.kernel.org, H Peter Anvin <hpa@...or.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Leo Yan <leo.yan@...aro.org>
Subject: Re: [PATCH 03/11] perf/x86: Add support for TSC in nanoseconds as a
 perf event clock

On Wed, Feb 09, 2022 at 10:49:21AM +0200, Adrian Hunter wrote:
> +	if (sched_clock_stable()) {
> +		offset = __sched_clock_offset;

The only sane behviour for !sched_clock_stable() is to completely refuse
service.