From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta1.migadu.com (out-18.mta1.migadu.com [95.215.58.18]) (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 9227A3126A0 for ; Mon, 24 Aug 2026 02:02:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787536939; cv=none; b=nIDcQtm+wX8SAx7OLaQRxC7avmN2uWMYtsG1YCrEm/gDxBTocza9rhJRa2WXTs71utvJ4pYGpF38HMbsdAm9Gq+zxLX9+O8zN4Gyhqar6nHJvhPMhHiEC0ofOX6wO0GLcScZ5I1334MtdYmOkP7KG0P2B5Dya1K798bgZ/45KqU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787536939; c=relaxed/simple; bh=xzuiCyOQkUshOw/dQoqpJd4cRH9nvcLkQjfLEBLwDso=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=vAUOH8nRoNdfo8kzniAuvy8clNzfnPwr9PYuFCJLFjvYrnvgqFZ8QpFqtbiwvbz1Y+A21lD9kxlzOTAmOnK1dLJTuKdsp9wAOJROa4GdakNtDbC5g+afget7pkPViiKOZS4OHxk2KBSndEWqiTooBMJ4LvE4AfTbNSRpH/DQ+JU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=ePUAeIbT; arc=none smtp.client-ip=95.215.58.18 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="ePUAeIbT" X-Envelope-To: linux-kselftest@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=xzuiCyOQkUshOw/dQoqpJd4cRH9nvcLkQjfLEBLwDso=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1787536935; v=1; x=1788141735; b=ePUAeIbTsQ3Rv6zSNS/shGcqqDvT0PGk0+NwtpsC6xA/eciFnPFeVnvM+2Yc7uay5Ijn0Xoo dPzzR2mBYOFXYefTVixXiRpTCPF7mbwhvWOgjQxctm3f2wuSzSXbPD/TeMP7T5CUKj5XdFgtIs6 jC+HqdrZqNez2yVAbu0j0HMI= X-Envelope-To: linux-kselftest@vger.kernel.org Received: from zgp.. (223.70.159.239) by smtp.migadu.com with ESMTPS id 0c116af405542692; Mon, 24 Aug 2026 02:02:15 +0000 X-Mizu-Trace-ID: 0c116af405542692 X-Migadu-Flow: FLOW_OUT From: Guopeng Zhang To: Waiman Long , Tejun Heo , Ridong Chen Cc: Johannes Weiner , Michal Koutny , Shuah Khan , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Guopeng Zhang Subject: [PATCH v2 3/3] selftests/cgroup: Add test for preserving boot-isolated CPUs Date: Mon, 24 Aug 2026 10:01:40 +0800 Message-ID: <20260824020140.21130-4-guopeng.zhang@linux.dev> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260824020140.21130-1-guopeng.zhang@linux.dev> References: <20260824020140.21130-1-guopeng.zhang@linux.dev> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Guopeng Zhang Put a CPU isolated at boot into an isolated partition, change the partition back to member and check that the CPU remains isolated. Signed-off-by: Guopeng Zhang --- .../selftests/cgroup/test_cpuset_prs.sh | 58 +++++++++++++++++++ 1 file changed, 58 insertions(+) diff --git a/tools/testing/selftests/cgroup/test_cpuset_prs.sh b/tools/testing/selftests/cgroup/test_cpuset_prs.sh index fdb3185570d4..131d8b4551ef 100755 --- a/tools/testing/selftests/cgroup/test_cpuset_prs.sh +++ b/tools/testing/selftests/cgroup/test_cpuset_prs.sh @@ -1155,6 +1155,63 @@ test_isolated() pause 0.05 } +# +# Select an online CPU isolated from scheduler domains at boot. +# $1: test name used in the skip message +# +get_boot_isolated_cpu() +{ + TEST_NAME=$1 + BOOT_ISOLATED_FILE=/sys/devices/system/cpu/isolated + + [[ -r $BOOT_ISOLATED_FILE ]] || { + echo "$TEST_NAME test SKIPPED: boot isolation state unavailable" + return 1 + } + BOOT_CPUS=$(cat $BOOT_ISOLATED_FILE) + [[ -n "$BOOT_CPUS" ]] || { + echo "$TEST_NAME test SKIPPED: no boot-isolated CPU" + return 1 + } + + BOOT_CPU=$(echo "$BOOT_CPUS" | sed -e 's/[,-].*//') + CPU_ONLINE=/sys/devices/system/cpu/cpu${BOOT_CPU}/online + [[ ! -e $CPU_ONLINE || $(cat $CPU_ONLINE) -eq 1 ]] || { + echo "$TEST_NAME test SKIPPED: CPU $BOOT_CPU is offline" + return 1 + } +} + +# +# A CPU isolated at boot must stay isolated after it is released by a dynamic +# isolated partition. +# +test_boot_isolated() +{ + TEST_NAME="Boot-isolated CPU partition release" + get_boot_isolated_cpu "$TEST_NAME" || return 0 + echo "Running $TEST_NAME test ..." + + cd $CGROUP2/test + echo member > cpuset.cpus.partition + echo $BOOT_CPU > cpuset.cpus + [[ $(cat cpuset.cpus.effective) = "$BOOT_CPU" ]] || { + echo "$TEST_NAME test SKIPPED: CPU $BOOT_CPU is unavailable" + echo "" > cpuset.cpus + cd $CGROUP2 + return 0 + } + test_partition isolated + test_partition member + check_isolcpus "." || { + echo "Boot-isolated CPU $BOOT_CPU was lost after partition release" + exit 1 + } + echo "" > cpuset.cpus + cd $CGROUP2 + echo "$TEST_NAME test PASSED." +} + # # Wait for inotify event for the given file and read it # $1: cgroup file to wait for @@ -1226,5 +1283,6 @@ trap cleanup 0 2 3 6 run_state_test TEST_MATRIX run_remote_state_test REMOTE_TEST_MATRIX test_isolated +test_boot_isolated test_inotify echo "All tests PASSED." -- 2.43.0