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5ceedc09f2
Give some basic perf record callgraph coverage. Signed-off-by: Ian Rogers <irogers@google.com> Reviewed-by: James Clark <james.clark@linaro.org> Tested-by: Thomas Richter <tmricht@linux.ibm.com> Link: https://lore.kernel.org/r/20250628015553.1270748-1-irogers@google.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
412 lines
11 KiB
Bash
Executable file
412 lines
11 KiB
Bash
Executable file
#!/bin/bash
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# perf record tests (exclusive)
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# SPDX-License-Identifier: GPL-2.0
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set -e
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shelldir=$(dirname "$0")
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# shellcheck source=lib/waiting.sh
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. "${shelldir}"/lib/waiting.sh
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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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testsym="test_loop"
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testsym2="brstack"
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skip_test_missing_symbol ${testsym}
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skip_test_missing_symbol ${testsym2}
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err=0
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perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
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script_output=$(mktemp /tmp/__perf_test.perf.data.XXXXX.script)
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testprog="perf test -w thloop"
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cpu_pmu_dir="/sys/bus/event_source/devices/cpu*"
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br_cntr_file="/caps/branch_counter_nr"
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br_cntr_output="branch stack counters"
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br_cntr_script_output="br_cntr: A"
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default_fd_limit=$(ulimit -Sn)
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# With option --threads=cpu the number of open file descriptors should be
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# equal to sum of: nmb_cpus * nmb_events (2+dummy),
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# nmb_threads for perf.data.n (equal to nmb_cpus) and
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# 2*nmb_cpus of pipes = 4*nmb_cpus (each pipe has 2 ends)
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# All together it needs 8*nmb_cpus file descriptors plus some are also used
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# outside of testing, thus raising the limit to 16*nmb_cpus
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min_fd_limit=$(($(getconf _NPROCESSORS_ONLN) * 16))
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cleanup() {
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rm -f "${perfdata}"
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rm -f "${perfdata}".old
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rm -f "${script_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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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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test_per_thread() {
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echo "Basic --per-thread mode test"
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if ! perf record -o /dev/null --quiet ${testprog} 2> /dev/null
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then
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echo "Per-thread record [Skipped event not supported]"
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return
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fi
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if ! perf record --per-thread -o "${perfdata}" ${testprog} 2> /dev/null
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then
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echo "Per-thread record [Failed record]"
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err=1
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return
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fi
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if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
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then
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echo "Per-thread record [Failed missing output]"
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err=1
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return
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fi
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# run the test program in background (for 30 seconds)
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${testprog} 30 &
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TESTPID=$!
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rm -f "${perfdata}"
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wait_for_threads ${TESTPID} 2
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perf record -p "${TESTPID}" --per-thread -o "${perfdata}" sleep 1 2> /dev/null
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kill ${TESTPID}
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if [ ! -e "${perfdata}" ]
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then
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echo "Per-thread record [Failed record -p]"
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err=1
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return
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fi
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if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
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then
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echo "Per-thread record [Failed -p missing output]"
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err=1
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return
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fi
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echo "Basic --per-thread mode test [Success]"
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}
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test_register_capture() {
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echo "Register capture test"
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if ! perf list pmu | grep -q 'br_inst_retired.near_call'
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then
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echo "Register capture test [Skipped missing event]"
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return
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fi
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if ! perf record --intr-regs=\? 2>&1 | grep -q 'available registers: AX BX CX DX SI DI BP SP IP FLAGS CS SS R8 R9 R10 R11 R12 R13 R14 R15'
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then
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echo "Register capture test [Skipped missing registers]"
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return
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fi
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if ! perf record -o - --intr-regs=di,r8,dx,cx -e br_inst_retired.near_call \
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-c 1000 --per-thread ${testprog} 2> /dev/null \
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| perf script -F ip,sym,iregs -i - 2> /dev/null \
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| grep -q "DI:"
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then
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echo "Register capture test [Failed missing output]"
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err=1
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return
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fi
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echo "Register capture test [Success]"
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}
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test_system_wide() {
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echo "Basic --system-wide mode test"
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if ! perf record -aB --synth=no -o "${perfdata}" ${testprog} 2> /dev/null
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then
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echo "System-wide record [Skipped not supported]"
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return
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fi
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if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
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then
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echo "System-wide record [Failed missing output]"
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err=1
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return
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fi
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if ! perf record -aB --synth=no -e cpu-clock,cs --threads=cpu \
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-o "${perfdata}" ${testprog} 2> /dev/null
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then
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echo "System-wide record [Failed record --threads option]"
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err=1
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return
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fi
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if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
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then
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echo "System-wide record [Failed --threads missing output]"
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err=1
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return
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fi
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echo "Basic --system-wide mode test [Success]"
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}
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test_workload() {
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echo "Basic target workload test"
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if ! perf record -o "${perfdata}" ${testprog} 2> /dev/null
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then
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echo "Workload record [Failed record]"
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err=1
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return
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fi
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if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
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then
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echo "Workload record [Failed missing output]"
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err=1
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return
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fi
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if ! perf record -e cpu-clock,cs --threads=package \
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-o "${perfdata}" ${testprog} 2> /dev/null
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then
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echo "Workload record [Failed record --threads option]"
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err=1
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return
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fi
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if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
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then
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echo "Workload record [Failed --threads missing output]"
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err=1
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return
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fi
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echo "Basic target workload test [Success]"
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}
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test_branch_counter() {
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echo "Branch counter test"
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# Check if the branch counter feature is supported
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for dir in $cpu_pmu_dir
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do
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if [ ! -e "$dir$br_cntr_file" ]
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then
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echo "branch counter feature not supported on all core PMUs ($dir) [Skipped]"
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return
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fi
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done
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if ! perf record -o "${perfdata}" -e "{branches:p,instructions}" -j any,counter ${testprog} 2> /dev/null
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then
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echo "Branch counter record test [Failed record]"
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err=1
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return
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fi
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if ! perf report -i "${perfdata}" -D -q | grep -q "$br_cntr_output"
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then
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echo "Branch counter report test [Failed missing output]"
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err=1
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return
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fi
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if ! perf script -i "${perfdata}" -F +brstackinsn,+brcntr | grep -q "$br_cntr_script_output"
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then
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echo " Branch counter script test [Failed missing output]"
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err=1
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return
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fi
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echo "Branch counter test [Success]"
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}
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test_cgroup() {
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echo "Cgroup sampling test"
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if ! perf record -aB --synth=cgroup --all-cgroups -o "${perfdata}" ${testprog} 2> /dev/null
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then
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echo "Cgroup sampling [Skipped not supported]"
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return
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fi
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if ! perf report -i "${perfdata}" -D | grep -q "CGROUP"
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then
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echo "Cgroup sampling [Failed missing output]"
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err=1
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return
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fi
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if ! perf script -i "${perfdata}" -F cgroup | grep -q -v "unknown"
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then
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echo "Cgroup sampling [Failed cannot resolve cgroup names]"
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err=1
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return
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fi
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echo "Cgroup sampling test [Success]"
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}
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test_uid() {
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echo "Uid sampling test"
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if ! perf record -aB --synth=no --uid "$(id -u)" -o "${perfdata}" ${testprog} \
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> "${script_output}" 2>&1
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then
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if grep -q "libbpf.*EPERM" "${script_output}"
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then
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echo "Uid sampling [Skipped permissions]"
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return
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else
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echo "Uid sampling [Failed to record]"
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err=1
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# cat "${script_output}"
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return
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fi
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fi
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if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
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then
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echo "Uid sampling [Failed missing output]"
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err=1
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return
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fi
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echo "Uid sampling test [Success]"
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}
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test_leader_sampling() {
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echo "Basic leader sampling test"
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if ! perf record -o "${perfdata}" -e "{cycles,cycles}:Su" -- \
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perf test -w brstack 2> /dev/null
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then
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echo "Leader sampling [Failed record]"
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err=1
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return
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fi
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perf script -i "${perfdata}" | grep brstack > $script_output
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# Check if the two instruction counts are equal in each record.
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# However, the throttling code doesn't consider event grouping. During throttling, only the
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# leader is stopped, causing the slave's counts significantly higher. To temporarily solve this,
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# let's set the tolerance rate to 80%.
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# TODO: Revert the code for tolerance once the throttling mechanism is fixed.
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index=0
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valid_counts=0
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invalid_counts=0
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tolerance_rate=0.8
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while IFS= read -r line
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do
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cycles=$(echo $line | awk '{for(i=1;i<=NF;i++) if($i=="cycles:") print $(i-1)}')
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if [ $(($index%2)) -ne 0 ] && [ ${cycles}x != ${prev_cycles}x ]
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then
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invalid_counts=$(($invalid_counts+1))
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else
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valid_counts=$(($valid_counts+1))
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fi
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index=$(($index+1))
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prev_cycles=$cycles
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done < "${script_output}"
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total_counts=$(bc <<< "$invalid_counts+$valid_counts")
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if (( $(bc <<< "$total_counts <= 0") ))
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then
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echo "Leader sampling [No sample generated]"
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err=1
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return
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fi
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isok=$(bc <<< "scale=2; if (($invalid_counts/$total_counts) < (1-$tolerance_rate)) { 0 } else { 1 };")
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if [ $isok -eq 1 ]
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then
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echo "Leader sampling [Failed inconsistent cycles count]"
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err=1
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else
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echo "Basic leader sampling test [Success]"
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fi
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}
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test_topdown_leader_sampling() {
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echo "Topdown leader sampling test"
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if ! perf stat -e "{slots,topdown-retiring}" true 2> /dev/null
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then
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echo "Topdown leader sampling [Skipped event parsing failed]"
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return
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fi
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if ! perf record -o "${perfdata}" -e "{instructions,slots,topdown-retiring}:S" true 2> /dev/null
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then
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echo "Topdown leader sampling [Failed topdown events not reordered correctly]"
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err=1
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return
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fi
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echo "Topdown leader sampling test [Success]"
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}
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test_precise_max() {
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local -i skipped=0
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echo "precise_max attribute test"
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# Just to make sure event cycles is supported for sampling
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if perf record -o "${perfdata}" -e "cycles" true 2> /dev/null
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then
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if ! perf record -o "${perfdata}" -e "cycles:P" true 2> /dev/null
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then
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echo "precise_max attribute [Failed cycles:P event]"
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err=1
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return
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fi
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else
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echo "precise_max attribute [Skipped no cycles:P event]"
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((skipped+=1))
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fi
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# On s390 event instructions is not supported for perf record
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if perf record -o "${perfdata}" -e "instructions" true 2> /dev/null
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then
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# On AMD, cycles and instructions events are treated differently
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if ! perf record -o "${perfdata}" -e "instructions:P" true 2> /dev/null
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then
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echo "precise_max attribute [Failed instructions:P event]"
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err=1
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return
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fi
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else
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echo "precise_max attribute [Skipped no instructions:P event]"
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((skipped+=1))
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fi
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if [ $skipped -eq 2 ]
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then
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echo "precise_max attribute [Skipped no hardware events]"
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else
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echo "precise_max attribute test [Success]"
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fi
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}
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test_callgraph() {
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echo "Callgraph test"
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case $(uname -m)
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in s390x)
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cmd_flags="--call-graph dwarf -e cpu-clock";;
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*)
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cmd_flags="-g";;
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esac
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if ! perf record -o "${perfdata}" $cmd_flags perf test -w brstack
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then
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echo "Callgraph test [Failed missing output]"
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err=1
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return
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fi
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if ! perf report -i "${perfdata}" 2>&1 | grep "${testsym2}"
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then
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echo "Callgraph test [Failed missing symbol]"
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err=1
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return
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fi
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echo "Callgraph test [Success]"
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}
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# raise the limit of file descriptors to minimum
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if [[ $default_fd_limit -lt $min_fd_limit ]]; then
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ulimit -Sn $min_fd_limit
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fi
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test_per_thread
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test_register_capture
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test_system_wide
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test_workload
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test_branch_counter
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test_cgroup
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test_uid
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test_leader_sampling
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test_topdown_leader_sampling
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test_precise_max
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test_callgraph
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# restore the default value
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ulimit -Sn $default_fd_limit
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cleanup
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exit $err
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