119 lines
3.4 KiB
Bash
119 lines
3.4 KiB
Bash
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#!/bin/sh
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# Check branch stack sampling
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# SPDX-License-Identifier: GPL-2.0
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# German Gomez <german.gomez@arm.com>, 2022
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# we need a C compiler to build the test programs
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# so bail if none is found
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if ! [ -x "$(command -v cc)" ]; then
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echo "failed: no compiler, install gcc"
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exit 2
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fi
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# skip the test if the hardware doesn't support branch stack sampling
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# and if the architecture doesn't support filter types: any,save_type,u
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if ! perf record -o- --no-buildid --branch-filter any,save_type,u -- true > /dev/null 2>&1 ; then
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echo "skip: system doesn't support filter types: any,save_type,u"
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exit 2
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fi
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TMPDIR=$(mktemp -d /tmp/__perf_test.program.XXXXX)
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cleanup() {
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rm -rf $TMPDIR
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}
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trap cleanup exit term int
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gen_test_program() {
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# generate test program
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cat << EOF > $1
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#define BENCH_RUNS 999999
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int cnt;
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void bar(void) {
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} /* return */
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void foo(void) {
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bar(); /* call */
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} /* return */
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void bench(void) {
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void (*foo_ind)(void) = foo;
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if ((cnt++) % 3) /* branch (cond) */
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foo(); /* call */
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bar(); /* call */
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foo_ind(); /* call (ind) */
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}
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int main(void)
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{
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int cnt = 0;
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while (1) {
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if ((cnt++) > BENCH_RUNS)
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break;
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bench(); /* call */
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} /* branch (uncond) */
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return 0;
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}
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EOF
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}
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test_user_branches() {
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echo "Testing user branch stack sampling"
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gen_test_program "$TEMPDIR/program.c"
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cc -fno-inline -g "$TEMPDIR/program.c" -o $TMPDIR/a.out
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perf record -o $TMPDIR/perf.data --branch-filter any,save_type,u -- $TMPDIR/a.out > /dev/null 2>&1
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perf script -i $TMPDIR/perf.data --fields brstacksym | xargs -n1 > $TMPDIR/perf.script
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# example of branch entries:
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# foo+0x14/bar+0x40/P/-/-/0/CALL
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set -x
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egrep -m1 "^bench\+[^ ]*/foo\+[^ ]*/IND_CALL$" $TMPDIR/perf.script
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egrep -m1 "^foo\+[^ ]*/bar\+[^ ]*/CALL$" $TMPDIR/perf.script
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egrep -m1 "^bench\+[^ ]*/foo\+[^ ]*/CALL$" $TMPDIR/perf.script
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egrep -m1 "^bench\+[^ ]*/bar\+[^ ]*/CALL$" $TMPDIR/perf.script
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egrep -m1 "^bar\+[^ ]*/foo\+[^ ]*/RET$" $TMPDIR/perf.script
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egrep -m1 "^foo\+[^ ]*/bench\+[^ ]*/RET$" $TMPDIR/perf.script
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egrep -m1 "^bench\+[^ ]*/bench\+[^ ]*/COND$" $TMPDIR/perf.script
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egrep -m1 "^main\+[^ ]*/main\+[^ ]*/UNCOND$" $TMPDIR/perf.script
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set +x
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# some branch types are still not being tested:
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# IND COND_CALL COND_RET SYSCALL SYSRET IRQ SERROR NO_TX
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}
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# first argument <arg0> is the argument passed to "--branch-stack <arg0>,save_type,u"
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# second argument are the expected branch types for the given filter
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test_filter() {
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local filter=$1
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local expect=$2
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echo "Testing branch stack filtering permutation ($filter,$expect)"
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gen_test_program "$TEMPDIR/program.c"
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cc -fno-inline -g "$TEMPDIR/program.c" -o $TMPDIR/a.out
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perf record -o $TMPDIR/perf.data --branch-filter $filter,save_type,u -- $TMPDIR/a.out > /dev/null 2>&1
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perf script -i $TMPDIR/perf.data --fields brstack | xargs -n1 > $TMPDIR/perf.script
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# fail if we find any branch type that doesn't match any of the expected ones
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# also consider UNKNOWN branch types (-)
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if egrep -vm1 "^[^ ]*/($expect|-|( *))$" $TMPDIR/perf.script; then
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return 1
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fi
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}
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set -e
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test_user_branches
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test_filter "any_call" "CALL|IND_CALL|COND_CALL|SYSCALL|IRQ"
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test_filter "call" "CALL|SYSCALL"
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test_filter "cond" "COND"
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test_filter "any_ret" "RET|COND_RET|SYSRET|ERET"
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test_filter "call,cond" "CALL|SYSCALL|COND"
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test_filter "any_call,cond" "CALL|IND_CALL|COND_CALL|IRQ|SYSCALL|COND"
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test_filter "cond,any_call,any_ret" "COND|CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|RET|COND_RET|SYSRET|ERET"
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