linux-kernel - Re: [tip: perf/urgent] perf/x86/amd/core: Fix Family 17h+ instruction cache events

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Message-ID: <c409c331-da7d-7424-e0db-a4c61ea423ca@maine.edu>
Date: Fri, 16 May 2025 10:18:07 -0400 (EDT)
From: Vince Weaver <vincent.weaver@...ne.edu>
To: linux-kernel@...r.kernel.org
cc: linux-tip-commits@...r.kernel.org, Sandipan Das <sandipan.das@....com>, 
    Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
    linux-perf-users@...r.kernel.org, x86@...nel.org
Subject: Re: [tip: perf/urgent] perf/x86/amd/core: Fix Family 17h+ instruction
 cache events

On Fri, 16 May 2025, tip-bot2 for Sandipan Das wrote:

> The following commit has been merged into the perf/urgent branch of tip:
> 

> perf/x86/amd/core: Fix Family 17h+ instruction cache events
> 
> PMCx080 and PMCx081 report incorrect IC accesses and misses respectively
> for all Family 17h and later processors. PMCx060 unit mask 0x10 replaces
> PMCx081 for counting IC misses but there is no suitable replacement for
> counting IC accesses.

can you link to the errata document that describes this problem as well as 
maybe give a rundown of how and why this breaks?

Vince Weaver
vincent.weaver@...ne.edu