From: John Garry <john.garry@huawei.com>
To: Andrew Kilroy <andrew.kilroy@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-perf-users@vger.kernel.org"
<linux-perf-users@vger.kernel.org>,
"acme@kernel.org" <acme@kernel.org>,
"Andi Kleen" <ak@linux.intel.com>
Cc: Will Deacon <will@kernel.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Leo Yan <leo.yan@linaro.org>, Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>,
"Namhyung Kim" <namhyung@kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Zhangshaokun <zhangshaokun@hisilicon.com>
Subject: Re: [RFC PATCH 1/1] perf arm64: Implement --topdown with metrics
Date: Fri, 28 Jan 2022 18:00:57 +0000 [thread overview]
Message-ID: <2bd5593e-615f-2ad1-ce03-cb452c7cd370@huawei.com> (raw)
In-Reply-To: <6ba550d1-61bc-e229-2a64-331cfa59c388@arm.com>
On 05/01/2022 16:58, Andrew Kilroy wrote:
>>
>
Sorry for very slow response..
> The --topdown kernel event colouring is dictated by a large if-else
> statement in stat-shadow.c:perf_stat__print_shadow_stats.
>
> There are branches depending on what is returned by
> perf_stat_evsel__is() for example
>
> } else if (perf_stat_evsel__is(evsel, TOPDOWN_FETCH_BUBBLES)) {
> double fe_bound = td_fe_bound(cpu, st, &rsd);
>
> if (fe_bound > 0.2)
> color = PERF_COLOR_RED;
> print_metric(config, ctxp, color, "%8.1f%%", "frontend bound",
> fe_bound * 100.);
> } else if (perf_stat_evsel__is(evsel, TOPDOWN_SLOTS_RETIRED)) {
>
>
>
> Because the patches are enabling metrics (equivalent of the -M
> 'somemetricname' option), the perf_stat__print_shadow_stats function
> always makes calls to generic_metric(), where colours are never picked.
>
> Seeing thresholds like:
>
> retiring > 0.7
> fe_bound > 0.2
> be_bound > 0.2
> bad_spec > 0.1
>
>
> I'm not sure about adding the colouring really. Are these thresholds
> x86 specific?
There is info on topdown for vtune here:
https://www.intel.com/content/www/us/en/develop/documentation/vtune-cookbook/top/methodologies/top-down-microarchitecture-analysis-method.html
The threshold info described there seems somewhat consistent with perf
tool topdown thresholds and that is based on general guidelines for
certain compute categories.
Andi did mention "specification" here:
https://lore.kernel.org/lkml/CABPqkBRftsHEAEwgCn3i3=mfk9fjh5r4MycdjHKRka5voTj9JA@mail.gmail.com/
But I don't know it, apart from a paper:
file:///home/john/Downloads/TopDown-Yasin-ISPASS14.pdf
Thanks,
John
next prev parent reply other threads:[~2022-01-28 18:01 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-10 12:37 [PATCH v2 0/2] perf vendor events: Arm Neoverse N2 Andrew Kilroy
2021-12-10 12:37 ` [PATCH v2 1/2] perf vendor events: For the " Andrew Kilroy
2021-12-10 13:21 ` John Garry
2021-12-14 18:42 ` [RFC PATCH 0/1] topdown with metrics Andrew Kilroy
2021-12-14 18:42 ` [RFC PATCH 1/1] perf arm64: Implement --topdown " Andrew Kilroy
2021-12-14 20:32 ` Ian Rogers
2021-12-15 10:38 ` James Clark
2021-12-15 10:52 ` John Garry
2021-12-15 12:38 ` Andrew Kilroy
2021-12-15 12:53 ` John Garry
2022-01-06 16:33 ` Andrew Kilroy
2022-01-06 18:24 ` John Garry
2022-01-11 15:07 ` [RFC PATCH v2 0/5] topdown " Andrew Kilroy
2022-01-11 15:07 ` [RFC PATCH v2 1/5] perf stat: Implement --topdown " Andrew Kilroy
2022-01-28 13:44 ` John Garry
2022-01-11 15:07 ` [RFC PATCH v2 2/5] perf stat: Topdown kernel events setup function Andrew Kilroy
2022-01-11 15:07 ` [RFC PATCH v2 3/5] perf stat: Topdown json metrics " Andrew Kilroy
2022-01-11 15:07 ` [RFC PATCH v2 4/5] perf stat: Detect if topdown kernel events supported Andrew Kilroy
2022-01-11 15:07 ` [RFC PATCH v2 5/5] perf stat: Ensure only topdown kernel events used on x86 Andrew Kilroy
2022-01-20 9:26 ` [RFC PATCH v2 0/5] topdown with metrics John Garry
2022-01-20 16:22 ` Al Grant
2022-01-27 11:42 ` Andrew Kilroy
2022-02-08 15:58 ` Andrew Kilroy
2021-12-20 17:21 ` [RFC PATCH 1/1] perf arm64: Implement --topdown " Andrew Kilroy
2021-12-21 14:03 ` Andi Kleen
2022-01-27 11:11 ` Andrew Kilroy
2021-12-17 10:19 ` John Garry
2021-12-21 14:31 ` Andrew Kilroy
2022-01-05 16:58 ` Andrew Kilroy
2022-01-28 18:00 ` John Garry [this message]
2021-12-10 12:37 ` [PATCH v2 2/2] perf vendor events: Rename arm64 arch std event files Andrew Kilroy
2021-12-10 13:46 ` John Garry
2021-12-10 19:01 ` Arnaldo Carvalho de Melo
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