linux-kernel - Re: [RESEND PATCH V3 3/8] perf/x86/intel: Support hardware TopDown metrics

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Message-ID: <20190828161754.GP5447@tassilo.jf.intel.com>
Date:   Wed, 28 Aug 2019 09:17:54 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kan.liang@...ux.intel.com, acme@...nel.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, jolsa@...nel.org,
        eranian@...gle.com, alexander.shishkin@...ux.intel.com
Subject: Re: [RESEND PATCH V3 3/8] perf/x86/intel: Support hardware TopDown
 metrics

> This really doesn't make sense to me; if you set FIXED_CTR3 := 0, you'll
> never trigger the overflow there; this then seems to suggest the actual

The 48bit counter might overflow in a few hours.

-Andi