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bb4b8f9697
When not running as root and with higher perf event paranoia values the perf record forked by TPEBS can fail to attach to the process. Skip the test in these scenarios. Intel TPEBS test skips on non-Intel CPUs. On Intel CPUs under a hypervisor the cache-misses event may not be present or precise. Skip the test under this condition. Refactor the output code to be placed in a file so that on a signal the file can be dumped. This was necessary to catch the issue above as the failing perf record command would fail without output. Signed-off-by: Ian Rogers <irogers@google.com> Tested-by: Thomas Falcon <thomas.falcon@intel.com> Cc: Weilin Wang <weilin.wang@intel.com> Cc: James Clark <james.clark@linaro.org> Link: https://lore.kernel.org/r/20250130170135.5817-1-irogers@google.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
86 lines
1.8 KiB
Bash
Executable File
86 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
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# test Intel TPEBS counting mode (exclusive)
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# SPDX-License-Identifier: GPL-2.0
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set -e
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ParanoidAndNotRoot() {
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[ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
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}
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if ! grep -q GenuineIntel /proc/cpuinfo
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then
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echo "Skipping non-Intel"
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exit 2
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fi
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if ParanoidAndNotRoot 0
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then
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echo "Skipping paranoid >0 and not root"
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exit 2
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fi
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stat_output=$(mktemp /tmp/__perf_stat_tpebs_output.XXXXX)
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cleanup() {
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rm -rf "${stat_output}"
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trap - EXIT TERM INT
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}
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trap_cleanup() {
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echo "Unexpected signal in ${FUNCNAME[1]}"
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cat "${stat_output}"
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cleanup
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exit 1
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}
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trap trap_cleanup EXIT TERM INT
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# Event to be used in tests
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event=cache-misses
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if ! perf record -e "${event}:p" -a -o /dev/null sleep 0.01 > "${stat_output}" 2>&1
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then
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echo "Missing ${event} support"
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cleanup
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exit 2
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fi
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test_with_record_tpebs() {
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echo "Testing with --record-tpebs"
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if ! perf stat -e "${event}:R" --record-tpebs -a sleep 0.01 > "${stat_output}" 2>&1
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then
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echo "Testing with --record-tpebs [Failed perf stat]"
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cat "${stat_output}"
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exit 1
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fi
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# Expected output:
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# $ perf stat --record-tpebs -e cache-misses:R -a sleep 0.01
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# Events enabled
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# [ perf record: Woken up 2 times to write data ]
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# [ perf record: Captured and wrote 0.056 MB - ]
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#
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# Performance counter stats for 'system wide':
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#
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# 0 cache-misses:R
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#
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# 0.013963299 seconds time elapsed
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if ! grep "perf record" "${stat_output}"
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then
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echo "Testing with --record-tpebs [Failed missing perf record]"
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cat "${stat_output}"
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exit 1
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fi
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if ! grep "${event}:R" "${stat_output}" && ! grep "/${event}/R" "${stat_output}"
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then
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echo "Testing with --record-tpebs [Failed missing event name]"
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cat "${stat_output}"
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exit 1
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fi
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echo "Testing with --record-tpebs [Success]"
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}
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test_with_record_tpebs
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cleanup
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exit 0
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