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The test "Check branch stack sampling" depends on finding symbol brstack_bench (and several others) in perf, and fails if perf has been stripped and no debug object is available. In that case, skip the test instead. Example: Before: $ strip tools/perf/perf $ tools/perf/perf buildid-cache -p `realpath tools/perf/perf` $ tools/perf/perf test -v 'branch stack sampling' 112: Check branch stack sampling : --- start --- test child forked, pid 123741 Testing user branch stack sampling + grep -E -m1 ^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/IND_CALL/.*$ /tmp/__perf_test.program.5Dz1U/perf.script + cleanup + rm -rf /tmp/__perf_test.program.5Dz1U test child finished with -1 ---- end ---- Check branch stack sampling: FAILED! After: $ tools/perf/perf test -v 'branch stack sampling' 112: Check branch stack sampling : --- start --- test child forked, pid 125157 perf does not have symbol 'brstack_bench' perf is missing symbols - skipping test test child finished with -2 ---- end ---- Check branch stack sampling: Skip Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Ian Rogers <irogers@google.com> Cc: German Gomez <german.gomez@arm.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Leo Yan <leo.yan@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20231123075848.9652-7-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
83 lines
3.0 KiB
Bash
Executable File
83 lines
3.0 KiB
Bash
Executable File
#!/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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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 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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skip_test_missing_symbol brstack_bench
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TMPDIR=$(mktemp -d /tmp/__perf_test.program.XXXXX)
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TESTPROG="perf test -w brstack"
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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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test_user_branches() {
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echo "Testing user branch stack sampling"
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perf record -o $TMPDIR/perf.data --branch-filter any,save_type,u -- ${TESTPROG} > /dev/null 2>&1
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perf script -i $TMPDIR/perf.data --fields brstacksym | xargs -n1 > $TMPDIR/perf.script
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# example of branch entries:
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# brstack_foo+0x14/brstack_bar+0x40/P/-/-/0/CALL
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set -x
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grep -E -m1 "^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/IND_CALL/.*$" $TMPDIR/perf.script
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grep -E -m1 "^brstack_foo\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$" $TMPDIR/perf.script
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grep -E -m1 "^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/CALL/.*$" $TMPDIR/perf.script
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grep -E -m1 "^brstack_bench\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$" $TMPDIR/perf.script
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grep -E -m1 "^brstack_bar\+[^ ]*/brstack_foo\+[^ ]*/RET/.*$" $TMPDIR/perf.script
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grep -E -m1 "^brstack_foo\+[^ ]*/brstack_bench\+[^ ]*/RET/.*$" $TMPDIR/perf.script
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grep -E -m1 "^brstack_bench\+[^ ]*/brstack_bench\+[^ ]*/COND/.*$" $TMPDIR/perf.script
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grep -E -m1 "^brstack\+[^ ]*/brstack\+[^ ]*/UNCOND/.*$" $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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test_filter_filter=$1
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test_filter_expect=$2
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echo "Testing branch stack filtering permutation ($test_filter_filter,$test_filter_expect)"
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perf record -o $TMPDIR/perf.data --branch-filter $test_filter_filter,save_type,u -- ${TESTPROG} > /dev/null 2>&1
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perf script -i $TMPDIR/perf.data --fields brstack | xargs -n1 > $TMPDIR/perf.script
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# fail if we find any branch type that doesn't match any of the expected ones
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# also consider UNKNOWN branch types (-)
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if grep -E -vm1 "^[^ ]*/($test_filter_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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