From nobody Sat Oct 4 03:08:25 2025 Received: from mail-wm1-f74.google.com (mail-wm1-f74.google.com [209.85.128.74]) (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 E8B622ECD12 for ; Thu, 21 Aug 2025 08:14:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755764081; cv=none; b=DpDdbG6+k391leVH0jakrOmP8cclF/hIi+uT5NI9+vxdPnoIchgRfczT1viy+b2cLbP86t3Jjo0LftYzHaolnV3+PRupfOE/TtfW/JLnqjT7IpPTZVQl2fKkwaY9DOELZ2ufYe71G8i33Lhf5oo+9wtuINdG7u3TVU/4PovWnzU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755764081; c=relaxed/simple; bh=Zido7BGGyCct8PB7xiBoqrYPrOfJP7X7Fr0Wiblezzg=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=ogWikzrO5dz6NY0U+ZNZ5g806wVv5b9rPk2ufdCY4MFzcF6FCze1L+v9hxQypcO5lnKmkVACr7CWPI5jp4zJ7rKG5GTxyt3E6OmkdG9KCUnP4M/GLqODbjsr0V5Fb692ByM8RyFFYPjtREYkst1BarjzFMLJenvlMX1u3xPIUvQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--vdonnefort.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=D4p3WyuL; arc=none smtp.client-ip=209.85.128.74 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--vdonnefort.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="D4p3WyuL" Received: by mail-wm1-f74.google.com with SMTP id 5b1f17b1804b1-45a1b05b15eso4986095e9.1 for ; Thu, 21 Aug 2025 01:14:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1755764077; x=1756368877; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=YuQZHh/5I/+ZxLcLKvlHxM6rBuApcg0gP5KQuEHQPgA=; b=D4p3WyuLfmCbbl28JdE3F2Pu0BEe7rmkWhLIr9yR/2TWi6a6CI9tVAPuIrlIe4otUB BZCWUkfIa6q51yQ7NOEWX1heYeH+BjLdlbzGx3JYN3mzZacKDXnASWjCuESkfH0USBTJ Cevh2X4PXo25umkTZSP80zqQzwXJowM7ytj0Paix7/dGU6uMdFrqcJY7gH8Bx/aPgxVL 8q4PEqmCscP59qECW/uYmm6AgUtMkqNyjwxy6eNISyeaA1u5bZJ4h5dQ9FUXtNDLm8KC R+EPEwvb8WFcUMddjaAi7pEuTHfnk8VJXGf+Bo6PJYN50dnhsFLAg6L91pI5gA+FlwlE 6VrQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755764077; x=1756368877; h=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; bh=YuQZHh/5I/+ZxLcLKvlHxM6rBuApcg0gP5KQuEHQPgA=; b=t9z78IISGfIBaouDXhq8DV5CeWJzUbopCglMaam++m6+wX5rIjZjnaEAW9F69fAtYx IVgxaer9jH1eVym1qsHd9bHMxuQyqoMEw/9Ug2niEjHy+Lag/x87DCccKWGQ1WQJzFSD JZw1ZYHFKU8WefOmJrgf3xvRo5U5zUa8QjAiV2R2AKMsbEGhN7u9lTsp0lWxhxrwob6E onsATgnBURN92tcU9pCJm/gdQuFkux1p6s6l6iioV2yhSG4q/+J3R44jswORI8b64gLf owo17BBbF+nJ+r+MuMQJSd2qZ8Bn4zmxm1qoySXEsy7aX78CFUrMBydR4IEcvyHBCrCo 0Ekw== X-Forwarded-Encrypted: i=1; AJvYcCX/EmE9FibkJAMmszmk25SvXVc3QzfuOEE7HS0+qfD1B4xk132MMLctNxlE4iq2mVCZEdiHPd6cLhaA+II=@vger.kernel.org X-Gm-Message-State: AOJu0YxuVSn77SA/E4/H2e2/Em8580QAwKrE2LZR8ji4ekX4I0cxK1d9 bGD9NE0kXK1ketCvJUIp7rerelrXqCq3JsEe6v5lpADsE+rx/0/JOLbFVKC4Dn9x0hoxJ48D0lr 1KD468aC+5qBihJg/x+d4ew== X-Google-Smtp-Source: AGHT+IFMMEtGICfKL2zb2gyZ0RFhYHt6HTY8hUaeQd7Rm7nNHdZUXNjhKqLZBjHKkTE99BTV5Bzs4Nkm6UF9G/4v X-Received: from wmqa4.prod.google.com ([2002:a05:600c:3484:b0:459:dbaa:93b0]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:3b19:b0:459:e025:8c40 with SMTP id 5b1f17b1804b1-45b4d7f0ddamr12544005e9.10.1755764077591; Thu, 21 Aug 2025 01:14:37 -0700 (PDT) Date: Thu, 21 Aug 2025 09:14:00 +0100 In-Reply-To: <20250821081412.1008261-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250821081412.1008261-1-vdonnefort@google.com> X-Mailer: git-send-email 2.51.0.rc2.233.g662b1ed5c5-goog Message-ID: <20250821081412.1008261-13-vdonnefort@google.com> Subject: [PATCH v6 12/24] tracing: selftests: Add trace remote tests From: Vincent Donnefort To: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org, Vincent Donnefort , Shuah Khan , linux-kselftest@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Exercise the tracefs interface for trace remote with a set of tests to check: * loading/unloading (unloading.tc) * reset (reset.tc) * size changes (buffer_size.tc) * event integrity (trace_pipe) Cc: Shuah Khan Cc: linux-kselftest@vger.kernel.org Signed-off-by: Vincent Donnefort diff --git a/tools/testing/selftests/ftrace/test.d/remotes/buffer_size.tc b= /tools/testing/selftests/ftrace/test.d/remotes/buffer_size.tc new file mode 100644 index 000000000000..60bf431ccc91 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/remotes/buffer_size.tc @@ -0,0 +1,24 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Test trace remote buffer size + +. $TEST_DIR/remotes/functions + +test_buffer_size() +{ + echo 0 > tracing_on + assert_unloaded + + echo 4096 > buffer_size_kb + echo 1 > tracing_on + assert_loaded + + echo 0 > tracing_on + echo 7 > buffer_size_kb +} + +if [ -z "$SOURCE_REMOTE_TEST" ]; then + set -e + setup_remote_test + test_buffer_size +fi diff --git a/tools/testing/selftests/ftrace/test.d/remotes/functions b/tool= s/testing/selftests/ftrace/test.d/remotes/functions new file mode 100644 index 000000000000..504a495b3b1b --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/remotes/functions @@ -0,0 +1,33 @@ +# SPDX-License-Identifier: GPL-2.0 + +setup_remote() +{ + local name=3D$1 + + [ -e $TRACING_DIR/remotes/$name/write_event ] || exit_unresolved + + cd remotes/$name/ + echo 0 > tracing_on + clear_trace + echo 7 > buffer_size_kb + echo 0 > events/enable + echo 1 > events/$name/selftest/enable + echo 1 > tracing_on +} + +setup_remote_test() +{ + [ -d $TRACING_DIR/remotes/test/ ] || modprobe remote_test || exit_unresol= ved + + setup_remote "test" +} + +assert_loaded() +{ + grep -q "(loaded)" buffer_size_kb +} + +assert_unloaded() +{ + grep -q "(unloaded)" buffer_size_kb +} diff --git a/tools/testing/selftests/ftrace/test.d/remotes/reset.tc b/tools= /testing/selftests/ftrace/test.d/remotes/reset.tc new file mode 100644 index 000000000000..93d6eb2a807f --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/remotes/reset.tc @@ -0,0 +1,105 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Test trace remote reset + +. $TEST_DIR/remotes/functions + +get_cpu_ids() +{ + sed -n 's/^processor\s*:\s*\([0-9]\+\).*/\1/p' /proc/cpuinfo +} + +dump_trace() +{ + output=3D$(mktemp /tmp/remote_test.XXXXXX) + cat trace_pipe > $output & + pid=3D$! + sleep 1 + kill -1 $pid + + echo $output +} + +check_reset() +{ + write_event_path=3D"write_event" + taskset=3D"" + + clear_trace + + # Is the buffer empty? + output=3D$(dump_trace) + test $(wc -l $output | cut -d ' ' -f1) -eq 0 + + if $(echo $(pwd) | grep -q "per_cpu/cpu"); then + write_event_path=3D"../../write_event" + cpu_id=3D$(echo $(pwd) | sed -e 's/.*per_cpu\/cpu//') + taskset=3D"taskset -c $cpu_id" + fi + rm $output + + # Can we properly write a new event? + $taskset echo 7890 > $write_event_path + output=3D$(dump_trace) + test $(wc -l $output | cut -d ' ' -f1) -eq 1 + grep -q "id=3D7890" $output + rm $output +} + +test_global_interface() +{ + output=3D$(mktemp /tmp/remote_test.XXXXXX) + + # Confidence check + echo 123456 > write_event + output=3D$(dump_trace) + grep -q "id=3D123456" $output + rm $output + + # Reset single event + echo 1 > write_event + check_reset + + # Reset lost events + for i in $(seq 1 10000); do + echo 1 > write_event + done + check_reset +} + +test_percpu_interface() +{ + [ "$(get_cpu_ids | wc -l)" -ge 2 ] || return 0 + + for cpu in $(get_cpu_ids); do + taskset -c $cpu echo 1 > write_event + done + + check_non_empty=3D0 + for cpu in $(get_cpu_ids); do + cd per_cpu/cpu$cpu/ + + if [ $check_non_empty -eq 0 ]; then + check_reset + check_non_empty=3D1 + else + # Check we have only reset 1 CPU + output=3D$(dump_trace) + test $(wc -l $output | cut -d ' ' -f1) -eq 1 + rm $output + fi + cd - + done +} + +test_reset() +{ + test_global_interface + test_percpu_interface +} + +if [ -z "$SOURCE_REMOTE_TEST" ]; then + set -e + setup_remote_test + test_reset +fi diff --git a/tools/testing/selftests/ftrace/test.d/remotes/trace_pipe.tc b/= tools/testing/selftests/ftrace/test.d/remotes/trace_pipe.tc new file mode 100644 index 000000000000..f4bd2b3655e0 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/remotes/trace_pipe.tc @@ -0,0 +1,57 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Test trace remote trace_pipe + +. $TEST_DIR/remotes/functions + +test_trace_pipe() +{ + echo 0 > tracing_on + assert_unloaded + + echo 1024 > buffer_size_kb + echo 1 > tracing_on + assert_loaded + + output=3D$(mktemp /tmp/remote_test.XXXXXX) + + cat trace_pipe > $output & + pid=3D$! + + for i in $(seq 1 1000); do + echo $i > write_event + done + + echo 0 > tracing_on + sleep 1 + kill $pid + + prev_ts=3D0 # TODO: Init with proper clock value + prev_id=3D0 + + # Only keep + sed -i -e 's/\[[0-9]*\]\s*\([0-9]*.[0-9]*\): [a-z]* id=3D\([0-9]*\)/\1= \2/' $output + + IFS=3D$'\n' + for line in $(cat $output); do + ts=3D$(echo $line | cut -d ' ' -f 1) + id=3D$(echo $line | cut -d ' ' -f 2) + + test $(echo "$ts>$prev_ts" | bc) -eq 1 + test $id -eq $((prev_id + 1)) + + prev_ts=3D$ts + prev_id=3D$id + done + + test $prev_id -eq 1000 + + rm $output +} + +if [ -z "$SOURCE_REMOTE_TEST" ]; then + set -e + + setup_remote_test + test_trace_pipe +fi diff --git a/tools/testing/selftests/ftrace/test.d/remotes/unloading.tc b/t= ools/testing/selftests/ftrace/test.d/remotes/unloading.tc new file mode 100644 index 000000000000..99f97e100fde --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/remotes/unloading.tc @@ -0,0 +1,40 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Test trace remote unloading + +. $TEST_DIR/remotes/functions + +test_unloading() +{ + # No reader, writing + assert_loaded + + # No reader, no writing + echo 0 > tracing_on + assert_unloaded + + # 1 reader, no writing + cat trace_pipe & + pid=3D$! + sleep 1 + assert_loaded + kill $pid + assert_unloaded + + # No reader, no writing, events + echo 1 > tracing_on + echo 1 > write_event + echo 0 > tracing_on + assert_loaded + + # Test reset + clear_trace + assert_unloaded +} + +if [ -z "$SOURCE_REMOTE_TEST" ]; then + set -e + + setup_remote_test + test_unloading +fi --=20 2.51.0.rc2.233.g662b1ed5c5-goog