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fa1332a801
'perf mem/c2c' uses IBS Op PMU on AMD platforms. IBS Op PMU on Zen5 uarch has added support for Load Latency filtering. Implement 'perf mem/c2c' --ldlat using IBS Op Load Latency filtering capability. Some subtle differences between AMD and other arch: o --ldlat is disabled by default on AMD o Supported values are 128 to 2048. Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Ananth Narayan <ananth.narayan@amd.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Joe Mario <jmario@redhat.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sandipan Das <sandipan.das@amd.com> Cc: Santosh Shukla <santosh.shukla@amd.com> Cc: Stephane Eranian <eranian@google.com> Link: https://lore.kernel.org/r/20250429035938.1301-4-ravi.bangoria@amd.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
91 lines
2.5 KiB
Bash
Executable file
91 lines
2.5 KiB
Bash
Executable file
#!/bin/bash
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# Test data symbol (exclusive)
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# SPDX-License-Identifier: GPL-2.0
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# Leo Yan <leo.yan@linaro.org>, 2022
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shelldir=$(dirname "$0")
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# shellcheck source=lib/perf_has_symbol.sh
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. "${shelldir}"/lib/perf_has_symbol.sh
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skip_if_no_mem_event() {
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perf mem record -e list 2>&1 | grep -E -q 'available' && return 0
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return 2
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}
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skip_if_no_mem_event || exit 2
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skip_test_missing_symbol workload_datasym_buf1
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TEST_PROGRAM="perf test -w datasym"
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PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
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ERR_FILE=$(mktemp /tmp/__perf_test.stderr.XXXXX)
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check_result() {
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# The memory report format is as below:
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# 99.92% ... [.] workload_datasym_buf1+0x38
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result=$(perf mem report -i ${PERF_DATA} -s symbol_daddr -q 2>&1 |
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awk '/workload_datasym_buf1/ { print $4 }')
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# Testing is failed if has no any sample for "workload_datasym_buf1"
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[ -z "$result" ] && return 1
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while IFS= read -r line; do
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# The "data1" and "data2" fields in structure
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# "workload_datasym_buf1" have offset "0x0" and "0x38", returns
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# failure if detect any other offset value.
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if [ "$line" != "workload_datasym_buf1+0x0" ] && \
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[ "$line" != "workload_datasym_buf1+0x38" ]; then
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return 1
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fi
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done <<< "$result"
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return 0
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}
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cleanup_files()
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{
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echo "Cleaning up files..."
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rm -f ${PERF_DATA}
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}
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trap cleanup_files exit term int
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echo "Recording workload..."
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is_amd=$(grep -E -c 'vendor_id.*AuthenticAMD' /proc/cpuinfo)
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if (($is_amd >= 1)); then
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mem_events="$(perf mem record -v -e list 2>&1)"
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if ! [[ "$mem_events" =~ ^mem\-ldst.*ibs_op/(.*)/.*available ]]; then
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echo "ERROR: mem-ldst event is not matching"
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exit 1
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fi
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# --ldlat on AMD:
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# o Zen4 and earlier uarch does not support ldlat
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# o Even on supported platforms, it's disabled (--ldlat=0) by default.
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ldlat=${BASH_REMATCH[1]}
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if [[ -n $ldlat ]]; then
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if ! [[ "$ldlat" =~ ldlat=0 ]]; then
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echo "ERROR: ldlat not initialized to 0?"
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exit 1
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fi
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mem_events="$(perf mem record -v --ldlat=150 -e list 2>&1)"
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if ! [[ "$mem_events" =~ ^mem-ldst.*ibs_op/ldlat=150/.*available ]]; then
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echo "ERROR: --ldlat not honored?"
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exit 1
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fi
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fi
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# perf mem/c2c internally uses IBS PMU on AMD CPU which doesn't
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# support user/kernel filtering and per-process monitoring on older
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# kernels, spin program on specific CPU and test in per-CPU mode.
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perf mem record -vvv -o ${PERF_DATA} -C 0 -- taskset -c 0 $TEST_PROGRAM 2>"${ERR_FILE}"
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else
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perf mem record -vvv --all-user -o ${PERF_DATA} -- $TEST_PROGRAM 2>"${ERR_FILE}"
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fi
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check_result
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exit $?
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