diff options
| -rw-r--r-- | tools/perf/Documentation/perf-test.txt | 6 | ||||
| -rw-r--r-- | tools/perf/tests/builtin-test.c | 1 | ||||
| -rwxr-xr-x | tools/perf/tests/shell/coresight/callchain.sh | 172 | ||||
| -rw-r--r-- | tools/perf/tests/tests.h | 1 | ||||
| -rw-r--r-- | tools/perf/tests/workloads/Build | 2 | ||||
| -rw-r--r-- | tools/perf/tests/workloads/callchain.c | 33 |
6 files changed, 213 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-test.txt b/tools/perf/Documentation/perf-test.txt index 81c8525f5946..859df74e62ef 100644 --- a/tools/perf/Documentation/perf-test.txt +++ b/tools/perf/Documentation/perf-test.txt @@ -57,7 +57,8 @@ OPTIONS --workload=:: Run a built-in workload, to list them use '--list-workloads', current ones include: noploop, thloop, leafloop, sqrtloop, brstack, datasym, - context_switch_loop, deterministic, named_threads and landlock. + context_switch_loop, deterministic, named_threads, landlock and + callchain. Used with the shell script regression tests. @@ -69,7 +70,8 @@ OPTIONS 'named_threads' accepts the number of threads and the number of loops to do in each thread. - The datasym, landlock and deterministic workloads don't accept any. + The datasym, landlock, deterministic and callchain workloads don't accept + any. --list-workloads:: List the available workloads to use with -w/--workload. diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c index d115a19e5f0f..7d18cb6021d3 100644 --- a/tools/perf/tests/builtin-test.c +++ b/tools/perf/tests/builtin-test.c @@ -171,6 +171,7 @@ static struct test_workload *workloads[] = { &workload__jitdump, &workload__context_switch_loop, &workload__deterministic, + &workload__callchain, #ifdef HAVE_RUST_SUPPORT &workload__code_with_type, diff --git a/tools/perf/tests/shell/coresight/callchain.sh b/tools/perf/tests/shell/coresight/callchain.sh new file mode 100755 index 000000000000..13cca7dc1118 --- /dev/null +++ b/tools/perf/tests/shell/coresight/callchain.sh @@ -0,0 +1,172 @@ +#!/bin/bash +# CoreSight synthesized callchain (exclusive) +# SPDX-License-Identifier: GPL-2.0 + +glb_err=1 + +if ! tmpdir=$(mktemp -d /tmp/perf-cs-callchain-test.XXXXXX); then + echo "mktemp failed" + exit 1 +fi + +cleanup_files() +{ + rm -rf "$tmpdir" +} + +trap cleanup_files EXIT +trap 'cleanup_files; exit $glb_err' TERM INT + +skip_if_system_is_not_ready() +{ + perf list | grep -Pzq 'cs_etm//' || { + echo "[Skip] cs_etm event is not available" >&2 + return 2 + } + + # Requires root for trace in kernel + [ "$(id -u)" = 0 ] || { + echo "[Skip] No root permission" >&2 + return 2 + } + + return 0 +} + +record_trace() +{ + local data=$1 + local script=$2 + + local cf="$tmpdir/ctl" + local af="$tmpdir/ack" + + mkfifo "$cf" "$af" + + perf record -o "$data" -e cs_etm// --per-thread -D -1 --control fifo:"$cf","$af" -- \ + perf test --record-ctl fifo:"$cf","$af" -w callchain >/dev/null 2>&1 && + + # It is safe to use 'i3i' with a three-instruction interval, since the + # workload is compiled with -O0. + perf script --itrace=g16i3il64 -i "$data" > "$script" +} + +callchain_regex_1() +{ + printf '%s' \ +'perf[[:space:]]+[0-9]+[[:space:]]+\[[0-9]+\][[:space:]]+([0-9.]+:[[:space:]]+)?[0-9]+ instructions:[[:space:]]*\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain_foo\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'([[:space:]]+[[:xdigit:]]+ .*\n)*' +} + +callchain_regex_2() +{ + printf '%s' \ +'perf[[:space:]]+[0-9]+[[:space:]]+\[[0-9]+\][[:space:]]+([0-9.]+:[[:space:]]+)?[0-9]+ instructions:[[:space:]]*\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain_do_syscall\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain_foo\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'([[:space:]]+[[:xdigit:]]+ .*\n)*' +} + +callchain_regex_3() +{ + printf '%s' \ +'perf[[:space:]]+[0-9]+[[:space:]]+\[[0-9]+\][[:space:]]+([0-9.]+:[[:space:]]+)?[0-9]+ instructions:[[:space:]]*\n'\ +'[[:space:]]+[[:xdigit:]]+ syscall(@plt)?\+0x[[:xdigit:]]+ \(.*\)\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain_do_syscall\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain_foo\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'([[:space:]]+[[:xdigit:]]+ .*\n)*' +} + +callchain_regex_4() +{ + printf '%s' \ +'perf[[:space:]]+[0-9]+[[:space:]]+\[[0-9]+\][[:space:]]+([0-9.]+:[[:space:]]+)?[0-9]+ instructions:[[:space:]]*\n'\ +'[[:space:]]+[[:xdigit:]]+ .*\+0x[[:xdigit:]]+ \(\[kernel\.kallsyms\]\)\n'\ +'[[:space:]]+[[:xdigit:]]+ syscall(@plt)?\+0x[[:xdigit:]]+ \(.*\)\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain_do_syscall\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain_foo\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'[[:space:]]+[[:xdigit:]]+ callchain\+0x[[:xdigit:]]+ \(.*/perf\)\n'\ +'([[:space:]]+[[:xdigit:]]+ .*\n)*' +} + +find_after_line() +{ + local regex="$1" + local file="$2" + local start="$3" + local offset + local line + + # Search in byte offset + offset=$( + tail -n +"$start" "$file" | + grep -Pzob -m1 "$regex" | + tr '\0' '\n' | + sed -n 's/^\([0-9][0-9]*\):.*/\1/p;q' + ) + + if [ -z "$offset" ]; then + echo "Failed to match regex after line $start" >&2 + echo "Regex:" >&2 + printf '%s\n' "$regex" >&2 + echo "Context from line $start:" >&2 + sed -n "${start},$((start + 100))p" "$file" >&2 + return 1 + fi + + # Convert from offset to line + line=$( + tail -n +"$start" "$file" | + head -c "$offset" | + wc -l + ) + + echo "$((start + line))" +} + +check_callchain_flow() +{ + local file="$1" + local l1 l2 l3 l4 l5 l6 l7 + + # Callchain push + l1=$(find_after_line "$(callchain_regex_1)" "$file" 1) || return 1 + l2=$(find_after_line "$(callchain_regex_2)" "$file" "$((l1 + 1))") || return 1 + l3=$(find_after_line "$(callchain_regex_3)" "$file" "$((l2 + 1))") || return 1 + l4=$(find_after_line "$(callchain_regex_4)" "$file" "$((l3 + 1))") || return 1 + + # Callchain pop + l5=$(find_after_line "$(callchain_regex_3)" "$file" "$((l4 + 1))") || return 1 + l6=$(find_after_line "$(callchain_regex_2)" "$file" "$((l5 + 1))") || return 1 + l7=$(find_after_line "$(callchain_regex_1)" "$file" "$((l6 + 1))") || return 1 + + echo "Callchain flow matched:" + echo " l1=$l1 l2=$l2 l3=$l3 l4=$l4 l5=$l5 l6=$l6 l7=$l7" + + return 0 +} + +run_test() +{ + local data=$tmpdir/perf.data + local script=$tmpdir/perf.script + + if ! record_trace "$data" "$script"; then + echo "perf record/script failed" + return + fi + + check_callchain_flow "$script" || return + + glb_err=0 +} + +skip_if_system_is_not_ready || exit 2 + +run_test + +exit $glb_err diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h index 7cedf05be544..cee9e6b62dcc 100644 --- a/tools/perf/tests/tests.h +++ b/tools/perf/tests/tests.h @@ -248,6 +248,7 @@ DECLARE_WORKLOAD(inlineloop); DECLARE_WORKLOAD(jitdump); DECLARE_WORKLOAD(context_switch_loop); DECLARE_WORKLOAD(deterministic); +DECLARE_WORKLOAD(callchain); #ifdef HAVE_RUST_SUPPORT DECLARE_WORKLOAD(code_with_type); diff --git a/tools/perf/tests/workloads/Build b/tools/perf/tests/workloads/Build index 7bb4b9829ba2..048e371eb63e 100644 --- a/tools/perf/tests/workloads/Build +++ b/tools/perf/tests/workloads/Build @@ -13,6 +13,7 @@ perf-test-y += inlineloop.o perf-test-y += jitdump.o perf-test-y += context_switch_loop.o perf-test-y += deterministic.o +perf-test-y += callchain.o ifeq ($(CONFIG_RUST_SUPPORT),y) perf-test-y += code_with_type.o @@ -27,3 +28,4 @@ CFLAGS_traploop.o = -g -O0 -fno-inline -U_FORTIFY_SOURCE CFLAGS_inlineloop.o = -g -O2 CFLAGS_deterministic.o = -g -O0 -fno-inline -U_FORTIFY_SOURCE CFLAGS_named_threads.o = -g -O0 -fno-inline -U_FORTIFY_SOURCE +CFLAGS_callchain.o = -g -O0 -fno-inline -U_FORTIFY_SOURCE diff --git a/tools/perf/tests/workloads/callchain.c b/tools/perf/tests/workloads/callchain.c new file mode 100644 index 000000000000..abbb406ba90b --- /dev/null +++ b/tools/perf/tests/workloads/callchain.c @@ -0,0 +1,33 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/compiler.h> +#include <sys/syscall.h> +#include <unistd.h> +#include "../tests.h" + +/* + * Mark as noinline to establish the call chain, and avoid the static + * annotation to prevent LTO from renaming the functions. + */ +noinline void callchain_do_syscall(void); +noinline void callchain_foo(void); +noinline int callchain(int argc, const char **argv); + +noinline void callchain_do_syscall(void) +{ + syscall(SYS_gettid); +} + +noinline void callchain_foo(void) +{ + callchain_do_syscall(); +} + +noinline int callchain(int argc __maybe_unused, + const char **argv __maybe_unused) +{ + callchain_foo(); + + return 0; +} + +DEFINE_WORKLOAD(callchain); |