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|
#!/bin/bash
# Check branch stack sampling
# SPDX-License-Identifier: GPL-2.0
# German Gomez <german.gomez@arm.com>, 2022
shelldir=$(dirname "$0")
# shellcheck source=lib/perf_has_symbol.sh
. "${shelldir}"/lib/perf_has_symbol.sh
# skip the test if the hardware doesn't support branch stack sampling
# and if the architecture doesn't support filter types: any,save_type,u
if ! perf record -o- --no-buildid --branch-filter any,save_type,u -- true > /dev/null 2>&1 ; then
echo "skip: system doesn't support filter types: any,save_type,u"
exit 2
fi
skip_test_missing_symbol brstack_bench
err=0
TMPDIR=$(mktemp -d /tmp/__perf_test.program.XXXXX)
TESTPROG="perf test -w brstack"
cleanup() {
rm -rf $TMPDIR
trap - EXIT TERM INT
}
trap_cleanup() {
set +e
echo "Unexpected signal in ${FUNCNAME[1]}"
cleanup
exit 1
}
trap trap_cleanup EXIT TERM INT
test_user_branches() {
echo "Testing user branch stack sampling"
perf record -o "$TMPDIR/perf.data" --branch-filter any,save_type,u -- ${TESTPROG} > "$TMPDIR/record.txt" 2>&1
perf script -i "$TMPDIR/perf.data" --fields brstacksym > "$TMPDIR/perf.script"
# example of branch entries:
# brstack_foo+0x14/brstack_bar+0x40/P/-/-/0/CALL
expected=(
"^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/IND_CALL/.*$"
"^brstack_foo\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$"
"^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/CALL/.*$"
"^brstack_bench\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$"
"^brstack_bar\+[^ ]*/brstack_foo\+[^ ]*/RET/.*$"
"^brstack_foo\+[^ ]*/brstack_bench\+[^ ]*/RET/.*$"
"^brstack_bench\+[^ ]*/brstack_bench\+[^ ]*/COND/.*$"
"^brstack\+[^ ]*/brstack\+[^ ]*/UNCOND/.*$"
)
for x in "${expected[@]}"
do
if ! tr -s ' ' '\n' < "$TMPDIR/perf.script" | grep -E -m1 -q "$x"
then
echo "Branches missing $x"
err=1
fi
done
# some branch types are still not being tested:
# IND COND_CALL COND_RET SYSCALL SYSRET IRQ SERROR NO_TX
}
# first argument <arg0> is the argument passed to "--branch-stack <arg0>,save_type,u"
# second argument are the expected branch types for the given filter
test_filter() {
test_filter_filter=$1
test_filter_expect=$2
echo "Testing branch stack filtering permutation ($test_filter_filter,$test_filter_expect)"
perf record -o "$TMPDIR/perf.data" --branch-filter "$test_filter_filter,save_type,u" -- ${TESTPROG} > "$TMPDIR/record.txt" 2>&1
perf script -i "$TMPDIR/perf.data" --fields brstack > "$TMPDIR/perf.script"
# fail if we find any branch type that doesn't match any of the expected ones
# also consider UNKNOWN branch types (-)
if [ ! -s "$TMPDIR/perf.script" ]
then
echo "Empty script output"
err=1
return
fi
# Look for lines not matching test_filter_expect ignoring issues caused
# by empty output
tr -s ' ' '\n' < "$TMPDIR/perf.script" | grep '.' | \
grep -E -vm1 "^[^ ]*/($test_filter_expect|-|( *))/.*$" \
> "$TMPDIR/perf.script-filtered" || true
if [ -s "$TMPDIR/perf.script-filtered" ]
then
echo "Unexpected branch filter in script output"
cat "$TMPDIR/perf.script"
err=1
return
fi
}
set -e
test_user_branches
test_filter "any_call" "CALL|IND_CALL|COND_CALL|SYSCALL|IRQ"
test_filter "call" "CALL|SYSCALL"
test_filter "cond" "COND"
test_filter "any_ret" "RET|COND_RET|SYSRET|ERET"
test_filter "call,cond" "CALL|SYSCALL|COND"
test_filter "any_call,cond" "CALL|IND_CALL|COND_CALL|IRQ|SYSCALL|COND"
test_filter "cond,any_call,any_ret" "COND|CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|RET|COND_RET|SYSRET|ERET"
cleanup
exit $err
|
