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charset="UTF-8" Add unit tests in parse-events.c for parsing lock_held(), lock_held_read(), and lock_held_exclusive() BPF filter expressions (standalone predicates, negated predicates, and compound group expressions) and extend record_bpf_filter.sh with lock_held(), lock_held_read()/lock_held_write(), and ':R'/':W' recording tests. Example output: # perf test -v 'Parsing of BPF sample filters' 5: Parse event definition strings : 5.7: Parsing of BPF sample filters : Ok # perf test -v 'perf record sample filtering (by BPF) tests' 112: perf record sample filtering (by BPF) tests : Checking BPF-filter privilege Basic bpf-filter test Basic bpf-filter test [Success] Failing bpf-filter test Failing bpf-filter test [Success] Group bpf-filter test Group bpf-filter test [Success] Multiple bpf-filter test Multiple bpf-filter test [Success] Cgroup bpf-filter test Cgroup bpf-filter test [Success] Lock-held bpf-filter test Lock-held bpf-filter test [Success] 112: perf record sample filtering (by BPF) tests : Ok Signed-off-by: Ian Rogers --- tools/perf/tests/parse-events.c | 108 +++++++++++++++++ tools/perf/tests/shell/record_bpf_filter.sh | 122 ++++++++++++++++++++ 2 files changed, 230 insertions(+) diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c index 5f6f95c8a5b4..4cf9192762f2 100644 --- a/tools/perf/tests/parse-events.c +++ b/tools/perf/tests/parse-events.c @@ -8,9 +8,11 @@ #include "debug.h" #include "pmu.h" #include "pmus.h" +#include "bpf-filter.h" #include "strbuf.h" #include #include +#include #include "fncache.h" #include #include @@ -2938,6 +2940,111 @@ static int test__pmu_events_alias2(struct test_suite *test __maybe_unused, return ret; } +#ifdef HAVE_BPF_SKEL +static void clear_bpf_filter_exprs(struct list_head *expr_head) +{ + struct perf_bpf_filter_expr *expr, *tmp; + + list_for_each_entry_safe(expr, tmp, expr_head, list) { + list_del(&expr->list); + perf_bpf_filter_expr__delete(expr); + } +} + +static int do_test_bpf_filters(struct list_head *expr_head) +{ + struct perf_bpf_filter_expr *expr, *group; + const char *compound = "lock_held(rwsem:R) == 1 || lock_held(&dentry) != 0, period > 100"; + + /* Simple lock_held(&cgroup_mutex) */ + TEST_ASSERT_VAL("parse lock_held(&cgroup_mutex)", + __perf_bpf_filter__parse(expr_head, "lock_held(&cgroup_mutex)") == 0); + TEST_ASSERT_VAL("not empty", !list_empty(expr_head)); + expr = list_first_entry(expr_head, struct perf_bpf_filter_expr, list); + TEST_ASSERT_VAL("term is PBF_TERM_LOCK_HELD", expr->term == PBF_TERM_LOCK_HELD); + TEST_ASSERT_VAL("op is PBF_OP_EQ", expr->op == PBF_OP_EQ); + TEST_ASSERT_VAL("val is 1", expr->val == 1); + TEST_ASSERT_VAL("lock_name is &cgroup_mutex", + expr->lock_name && !strcmp(expr->lock_name, "&cgroup_mutex")); + clear_bpf_filter_exprs(expr_head); + + /* Negated !lock_held(cgroup_mutex) */ + TEST_ASSERT_VAL("parse !lock_held(cgroup_mutex)", + __perf_bpf_filter__parse(expr_head, "!lock_held(cgroup_mutex)") == 0); + TEST_ASSERT_VAL("not empty", !list_empty(expr_head)); + expr = list_first_entry(expr_head, struct perf_bpf_filter_expr, list); + TEST_ASSERT_VAL("term is PBF_TERM_LOCK_HELD", expr->term == PBF_TERM_LOCK_HELD); + TEST_ASSERT_VAL("op is PBF_OP_EQ", expr->op == PBF_OP_EQ); + TEST_ASSERT_VAL("val is 0", expr->val == 0); + TEST_ASSERT_VAL("lock_name is cgroup_mutex", + expr->lock_name && !strcmp(expr->lock_name, "cgroup_mutex")); + clear_bpf_filter_exprs(expr_head); + + /* Read/shared and write/exclusive predicates */ + TEST_ASSERT_VAL("parse lock_held_read(&mmap_lock)", + __perf_bpf_filter__parse(expr_head, "lock_held_read(&mmap_lock)") == 0); + TEST_ASSERT_VAL("not empty", !list_empty(expr_head)); + expr = list_first_entry(expr_head, struct perf_bpf_filter_expr, list); + TEST_ASSERT_VAL("term is PBF_TERM_LOCK_HELD", expr->term == PBF_TERM_LOCK_HELD); + TEST_ASSERT_VAL("part is PBF_LOCK_MODE_READ", expr->part == PBF_LOCK_MODE_READ); + TEST_ASSERT_VAL("op is PBF_OP_EQ", expr->op == PBF_OP_EQ); + TEST_ASSERT_VAL("val is 1", expr->val == 1); + TEST_ASSERT_VAL("lock_name is &mmap_lock", + expr->lock_name && !strcmp(expr->lock_name, "&mmap_lock")); + clear_bpf_filter_exprs(expr_head); + + TEST_ASSERT_VAL("parse !lock_held_exclusive(mmap_lock)", + __perf_bpf_filter__parse(expr_head, + "!lock_held_exclusive(mmap_lock)") == 0); + TEST_ASSERT_VAL("not empty", !list_empty(expr_head)); + expr = list_first_entry(expr_head, struct perf_bpf_filter_expr, list); + TEST_ASSERT_VAL("term is PBF_TERM_LOCK_HELD", expr->term == PBF_TERM_LOCK_HELD); + TEST_ASSERT_VAL("part is PBF_LOCK_MODE_WRITE", expr->part == PBF_LOCK_MODE_WRITE); + TEST_ASSERT_VAL("op is PBF_OP_EQ", expr->op == PBF_OP_EQ); + TEST_ASSERT_VAL("val is 0", expr->val == 0); + TEST_ASSERT_VAL("lock_name is mmap_lock", + expr->lock_name && !strcmp(expr->lock_name, "mmap_lock")); + clear_bpf_filter_exprs(expr_head); + + /* + * Comparison and compound group: + * lock_held(rwsem:R) == 1 || lock_held(&dentry) != 0, period > 100 + */ + TEST_ASSERT_VAL("parse compound lock_held filter", + __perf_bpf_filter__parse(expr_head, compound) == 0); + TEST_ASSERT_VAL("not empty", !list_empty(expr_head)); + expr = list_first_entry(expr_head, struct perf_bpf_filter_expr, list); + TEST_ASSERT_VAL("group op", expr->op == PBF_OP_GROUP_BEGIN); + TEST_ASSERT_VAL("groups not empty", !list_empty(&expr->groups)); + group = list_first_entry(&expr->groups, struct perf_bpf_filter_expr, list); + TEST_ASSERT_VAL("first group member lock_name", + group->lock_name && !strcmp(group->lock_name, "rwsem:R")); + TEST_ASSERT_VAL("first group member op", group->op == PBF_OP_EQ && group->val == 1); + group = list_last_entry(&expr->groups, struct perf_bpf_filter_expr, list); + TEST_ASSERT_VAL("second group member lock_name", + group->lock_name && !strcmp(group->lock_name, "&dentry")); + TEST_ASSERT_VAL("second group member op", group->op == PBF_OP_NEQ && group->val == 0); + expr = list_last_entry(expr_head, struct perf_bpf_filter_expr, list); + TEST_ASSERT_VAL("second term is period", expr->term == PBF_TERM_PERIOD && expr->val == 100); + + return TEST_OK; +} +#endif + +static int test__bpf_filters(struct test_suite *test __maybe_unused, + int subtest __maybe_unused) +{ +#ifdef HAVE_BPF_SKEL + struct list_head expr_head = LIST_HEAD_INIT(expr_head); + int ret = do_test_bpf_filters(&expr_head); + + clear_bpf_filter_exprs(&expr_head); + return ret; +#else + return TEST_SKIP; +#endif +} + static struct test_case tests__parse_events[] = { TEST_CASE_REASON("Test event parsing", events2, @@ -2952,6 +3059,7 @@ static struct test_case tests__parse_events[] = { "no aliases in sysfs"), TEST_CASE("Parsing of aliased events", pmu_events_alias2), TEST_CASE("Parsing of terms (event modifiers)", terms2), + TEST_CASE("Parsing of BPF sample filters", bpf_filters), { .name = NULL, } }; diff --git a/tools/perf/tests/shell/record_bpf_filter.sh b/tools/perf/tests/shell/record_bpf_filter.sh index 383574cb3bd3..ebaf8ee41622 100755 --- a/tools/perf/tests/shell/record_bpf_filter.sh +++ b/tools/perf/tests/shell/record_bpf_filter.sh @@ -176,6 +176,124 @@ test_bpf_filter_cgroup() { echo "Cgroup bpf-filter test [Success]" } +test_bpf_filter_lock_held() { + echo "Lock-held bpf-filter test" + lock_sym="cgroup_mutex" + + if [ -r /proc/kallsyms ] && ! grep -qw "${lock_sym}" /proc/kallsyms + then + lock_sym="slab_mutex" + fi + + if ! perf record -e task-clock --filter "lock_held(${lock_sym})" \ + -o "${perfdata}" true 2> /dev/null + then + if [ "$(id -u)" != 0 ] + then + echo "Lock-held bpf-filter test [Skipped permission]" + return + fi + if [ -r /proc/kallsyms ] && ! grep -qw "${lock_sym}" /proc/kallsyms + then + echo "Lock-held bpf-filter test [Skipped missing ${lock_sym}]" + return + fi + echo "Lock-held bpf-filter test [Failed ${lock_sym}]" + err=1 + return + fi + + if ! perf record -e task-clock --filter "!lock_held(${lock_sym})" \ + -o "${perfdata}" true 2> /dev/null + then + echo "Lock-held bpf-filter test [Failed !lock_held(${lock_sym})]" + err=1 + return + fi + + if ! perf record -e task-clock --filter 'lock_held(&dentry)' \ + -o "${perfdata}" true 2> /dev/null + then + echo "Lock-held bpf-filter test [Failed &dentry]" + err=1 + return + fi + + if ! perf record -e task-clock --filter 'lock_held(mmap_lock)' \ + -o "${perfdata}" perf bench mem mmap -t 2 -l 10 2> /dev/null + then + echo "Lock-held bpf-filter test [Failed mmap_lock]" + err=1 + return + fi + + if ! perf record -e task-clock --filter 'lock_held(rq_lock) || lock_held(spinlock)' \ + -o "${perfdata}" true 2> /dev/null + then + if ! perf record -e task-clock --filter 'lock_held(rq_lock) || lock_held(spinlock)' \ + -o /dev/null true 2>&1 | grep -q "Kernel BTF lacks required" + then + echo "Lock-held bpf-filter test [Failed rq_lock/spinlock]" + err=1 + return + fi + fi + + if ! perf record -e task-clock --filter 'lock_held(mutex) || lock_held(rwsem)' \ + -o "${perfdata}" true 2> /dev/null + then + echo "Lock-held bpf-filter test [Failed lock type]" + err=1 + return + fi + + if ! perf record -e task-clock \ + --filter 'lock_held_read(mmap_lock) || lock_held_write(mmap_lock)' \ + -o "${perfdata}" true 2> /dev/null + then + echo "Lock-held bpf-filter test [Failed lock_held_read/write(mmap_lock)]" + err=1 + return + fi + + if ! perf record -e task-clock --filter 'lock_held(mmap_lock:R) || lock_held(mmap_lock:W)' \ + -o "${perfdata}" true 2> /dev/null + then + echo "Lock-held bpf-filter test [Failed mmap_lock:R/:W]" + err=1 + return + fi + + if perf list tracepoint 2> /dev/null | grep -q kmem:mm_page_alloc + then + if ! perf record -e kmem:mm_page_alloc --filter 'lock_held(mutex) || lock_held(rwsem)' \ + -o "${perfdata}" true 2> /dev/null + then + echo "Lock-held bpf-filter test [Failed tracepoint kmem:mm_page_alloc]" + err=1 + return + fi + fi + + if perf record -e task-clock --filter 'lock_held_read(rq_lock)' \ + -o /dev/null true 2> /dev/null + then + echo "Lock-held bpf-filter test [Failed lock_held_read(rq_lock) should fail]" + err=1 + return + fi + + if perf record -e task-clock --filter 'lock_held(nonexistent_lock_xyz)' \ + -o /dev/null true 2> /dev/null + then + echo "Lock-held bpf-filter test [Failed nonexistent lock should fail]" + err=1 + return + fi + + echo "Lock-held bpf-filter test [Success]" +} + test_bpf_filter_priv if [ $err = 0 ]; then @@ -198,5 +316,9 @@ if [ $err = 0 ]; then test_bpf_filter_cgroup fi +if [ $err = 0 ]; then + test_bpf_filter_lock_held +fi + cleanup exit $err -- 2.56.0.212.g129ede20d9-goog