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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
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