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Message-ID: <cdc3c536-6e43-5694-f6ba-6cd7dabf9a1c@oracle.com>
Date: Thu, 17 Aug 2023 12:08:00 +0100
From: John Garry <john.g.garry@...cle.com>
To: James Clark <james.clark@....com>,
linux-perf-users@...r.kernel.org, irogers@...gle.com,
renyu.zj@...ux.alibaba.com, acme@...nel.org
Cc: Will Deacon <will@...nel.org>, Mike Leach <mike.leach@...aro.org>,
Leo Yan <leo.yan@...aro.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Kajol Jain <kjain@...ux.ibm.com>,
Haixin Yu <yuhaixin.yhx@...ux.alibaba.com>,
Nick Forrington <nick.forrington@....com>,
Kan Liang <kan.liang@...ux.intel.com>,
Eduard Zingerman <eddyz87@...il.com>,
Sohom Datta <sohomdatta1@...il.com>,
Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 5/6] perf vendor events arm64: Update stall_slot
workaround for N2 r0p3
On 16/08/2023 12:47, James Clark wrote:
> N2 r0p3 doesn't require the workaround [1], so gating on (#slots - 5) no
> longer works because all N2s have 5 slots. Use the new expression
> builtin that allows calling strcmp_cpuid_str() and comparing CPUIDs in
> metric formulas.
>
> In this case, the commented formula looks like this:
>
> strcmp_cpuid_str(0x410fd493) # greater than or equal to N2 r0p3
> | strcmp_cpuid_str(0x410fd490) ^ 1 # OR NOT any version of N2
>
> [1]:https://urldefense.com/v3/__https://gitlab.arm.com/telemetry-solution/telemetry-solution/-/blob/main/data/pmu/cpu/neoverse/neoverse-n2-r0p3.json__;!!ACWV5N9M2RV99hQ!JvpXOAN-7zsKcA750zS-vMlcJKvvIZ_H9zg6jitWJRMitlFGDrx8bXoMrhdK5ubhO8CtXObRFx7bDYM2R5Feqg$
> Signed-off-by: James Clark<james.clark@....com>
> ---
Reviewed-by: John Garry <john.g.garry@...cle.com>
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