From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f199.google.com (mail-dy1-f199.google.com [74.125.82.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DA63F3BB131 for ; Sun, 18 Oct 2026 05:37:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792301843; cv=none; b=fopeVnK2iBOHgb0QJ+BZ+fSgaALnSKg9NWb6OCpUVIcXcrndg+RGZk6FDHJH0zFDxsKaR4TTxAicsGorhsRwTXichcleSJhuKSgDC9M8O2PHq1jZqu4QLQewCFLOle1T0SiRba/EHo0YexPJSDCkTLLiWB5t7KaCi3KGCdsaedc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792301843; c=relaxed/simple; bh=Tda0Ij1c7QQIZ+bi2pZfSZmbq5pAlX7peaiknbUkAAo=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Cgr4syZn7UIaUAWG9hI31I+CMNdGV4iD+0qo0KhKncjHT7fYVHQGxUDZg8tfxLMjEKjK2YoVTXXmbIrs8E2hErRbwvkVF4ovFpSjh2TaSdfoaBSCtaxVZ5FXSaP2znn4yJhlsDP3SsPSYMsa6LFNZeJ8HifcO7xnp38tbaAwt1c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=T6JfVPxm; arc=none smtp.client-ip=74.125.82.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="T6JfVPxm" Received: by mail-dy1-f199.google.com with SMTP id 5a478bee46e88-35a4d2e39acso2477827eec.1 for ; Sat, 17 Oct 2026 22:37:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1792301840; x=1792906640; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=CBD0q56IaJAp2LEswZuUMnNpQnj5wb0tRC9PUrpa7m0=; b=T6JfVPxmlf7v8R6DGtxVi2JtzRWvyoPETm0yaGHWpLzENnPW7VJs/1HU43ZMBqZG4p aep9LDOXPguTFCrUl+n1H5euOiJdjETCQcY/F8G6hBkdttPpZTeeHQ9lFny5fLfxMcdN n1cFmfNzf2KOig3BCpWyPbleSE2xWeL1hqV4uzi9jPcx2aJOdojXcpghAnZJkEHoRayf HaF5k28TWQnDwP6wKy+n3nEySLqFiij8KbiSBLXniquy2KLhDSiZ0ZhJG/s36LFo9p7R wlYGnmHMN+p+12rjoz8OTe9wyjEV3qJBJ4Eahq2KvTr44Vq9K42mFROgrUoCqz23sFXY /DGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1792301840; x=1792906640; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=CBD0q56IaJAp2LEswZuUMnNpQnj5wb0tRC9PUrpa7m0=; b=dYRE7YKp7brBkP56Jdqd3MfXPWakH/WW/l2KSauwd+fvKvnDTBaV1q4oCkE5BQoEyI cLBzSLmrxznBohILLacVtk6/ouffkQO7KLErzMAbBb/oftgo6x7MzcFccnJSf8TFHXUl rYA8yqE1z+mOHw0n3QOEl6Is4gp0WSaO1eEFgZMzgt2jaft1MoY04uXsWg6Iv6tf9rtD fWOHXXKVRZljjL8ETkAqGfwCPiYz8ZFwIFc8taCLqf00LsfkDTf0zgay1taqI4z6hUKy A83hvXYx1PPX4pVDoUoPtx2E5vpGVuAJyYVhteiEqHzTjOkYhZgfv43A+frQuXhYE/W+ Tjlw== X-Forwarded-Encrypted: i=1; AKwUvBzEG/gL2/DIg9hKyPcOM/p8BjHNZ8mIfgsN2KVx2u+19MidYKNSH4TcPa+iVGhvcVz6xlEq3hlbQe4cSnv9/Kg/@vger.kernel.org X-Gm-Message-State: AFq9FYIEOKTNjMpcyluZ3qPPRMX45yw0Bydd1x/Oiu+aqmSXPUjStlLK SbynMKKV13NJgVhr320/8hZr4aCh3rfbvDv1C7OlN6FovxyAuUzNKgXMfYX+Q1MkDADacM3E6lO zgd0+sCdbnA== X-Received: from dlbds20.prod.google.com ([2002:a05:7022:2514:b0:170:e346:472d]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:170d:b0:145:4ef:e8de with SMTP id a92af1059eb24-1850c9cf21fmr6092819c88.6.1792301839549; Sat, 17 Oct 2026 22:37:19 -0700 (PDT) Date: Sat, 17 Oct 2026 22:37:07 -0700 In-Reply-To: <20261018053710.2572636-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20261017171437.2066343-1-irogers@google.com> <20261018053710.2572636-1-irogers@google.com> X-Mailer: git-send-email 2.56.0.212.g129ede20d9-goog Message-ID: <20261018053710.2572636-4-irogers@google.com> Subject: [PATCH v3 3/6] perf test: Add tests for lock_held() BPF sample filter From: Ian Rogers To: irogers@google.com, acme@kernel.org, namhyung@kernel.org Cc: adrian.hunter@intel.com, james.clark@linaro.org, jolsa@kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, rcu@vger.kernel.org Content-Type: text/plain; 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 | 114 ++++++++++++++++++++ 2 files changed, 222 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..9334b8b9b1c2 100755 --- a/tools/perf/tests/shell/record_bpf_filter.sh +++ b/tools/perf/tests/shell/record_bpf_filter.sh @@ -176,6 +176,116 @@ 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(${lock_sym})]" + err=1 + return + fi + + if ! perf record -e task-clock --filter 'lock_held(mmap_lock)' \ + -o "${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 +308,9 @@ 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