linux-kernel - Re: [PATCH v3] perf test: Introduce script for data symbol testing

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Date:   Fri, 30 Sep 2022 12:27:22 +0530
From:   Ravi Bangoria <ravi.bangoria@....com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.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>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, Ian Rogers <irogers@...gle.com>,
        Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: [PATCH v3] perf test: Introduce script for data symbol testing

Hi Leo,

On 24-Sep-22 7:04 PM, Leo Yan wrote:
> This commit introduces a shell script for data symbol testing.
> 
> The testing is designed a data structure with 64-byte alignment, it has
> two fields "data1" and "data2", and other fields are reserved.
> 
> Using "perf mem" command, we can record and report memory samples for a
> self-contained workload with 1 second duration.  If have no any memory
> sample for the data structure "buf1", it reports failure;  and by
> checking the offset in structure "buf1", if any memory accessing is not
> for "data1" and "data2" fields, it means wrong data symbol parsing and
> returns failure.

I'm working on adding support for perf mem/c2c on AMD:
https://lore.kernel.org/lkml/20220928095805.596-1-ravi.bangoria%40amd.com

And this test fails on AMD because perf mem/c2c internally use IBS pmu
which does not support user/kernel filtering and per-process monitoring.
Would it be possible for you to add below (ugly) hunk to this patch:

---
diff --git a/tools/perf/tests/shell/test_data_symbol.sh b/tools/perf/tests/shell/test_data_symbol.sh
index a153b0d84dc0..212082951b12 100755
--- a/tools/perf/tests/shell/test_data_symbol.sh
+++ b/tools/perf/tests/shell/test_data_symbol.sh
@@ -71,7 +71,12 @@ int main(void) {
 EOF
 
 echo "Recording workload..."
-perf mem record --all-user -o ${PERF_DATA} -- $TEST_PROGRAM &
+is_amd=$(egrep -c 'vendor_id.*AuthenticAMD' /proc/cpuinfo)
+if (($is_amd >= 1)); then
+	perf mem record -o ${PERF_DATA} -- -C 0 -- taskset -c 0 $TEST_PROGRAM &
+else
+	perf mem record --all-user -o ${PERF_DATA} -- $TEST_PROGRAM &
+fi
 PERFPID=$!
 
 sleep 1
---

Thanks,
Ravi