linux-kernel - Re: [PATCH] perf/x86/intel: fix ICL/SPR INST_RETIRED.PREC

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Date:   Wed, 13 Oct 2021 17:37:47 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Stephane Eranian <eranian@...gle.com>, linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, kan.liang@...el.com
Subject: Re: [PATCH] perf/x86/intel: fix ICL/SPR INST_RETIRED.PREC_DIST
 encodings


On 10/13/2021 5:12 PM, Stephane Eranian wrote:
> This patch fixes the encoding for INST_RETIRED.PREC_DIST as published by Intel
> (download.01.org/perfmon/) for Icelake. The official encoding
> is event code 0x00 umask 0x1, a change from Skylake where it was code 0xc0
> umask 0x1.
>
> With this patch applied it is possible to run:
> $ perf record -a -e cpu/event=0x00,umask=0x1/pp .....
>
> Whereas before this would fail.
>
> To avoid problems with tools which may use the old code, we maintain the old
> encoding for Icelake.
>
> Signed-off-by: Stephane Eranian <eranian@...gle.com>


Make sense.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>


-Andi