linux-kernel - Re: [PATCH v5 1/6] perf vendor events arm64: Add topdown L1 metrics for neoverse-n2

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Date:   Thu, 5 Jan 2023 19:02:04 +0800
From:   Jing Zhang <renyu.zj@...ux.alibaba.com>
To:     John Garry <john.g.garry@...cle.com>,
        Ian Rogers <irogers@...gle.com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Will Deacon <will@...nel.org>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Andrew Kilroy <andrew.kilroy@....com>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Zhuo Song <zhuo.song@...ux.alibaba.com>
Subject: Re: [PATCH v5 1/6] perf vendor events arm64: Add topdown L1 metrics
 for neoverse-n2



在 2023/1/5 下午6:13, John Garry 写道:
> Maybe during runtime we could create a pseudo metric/event for SLOT. This metric would be created during init, and it always just returns the value which was read from PMMIR_EL1.
> 
> I'm not sure how well that would play will trying to resolve metrics when building generated pmu-events.c, but I don't think it's all too difficult to achieve.
> 

I'll try it in the v7 patch. I want to release the v6 patch first, to correct a mistake I made. :)

> Have you actually read this value for the n2 core? Does look correct?

Yes, I read it in n2 and it has a value of 5 which is correct. If the
STALL_SLOT event is not implemented, PMMIR_EL1.SLOT might read as zero.