From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-62.mta0.migadu.com [91.218.175.62]) (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 5ACA94457DA for ; Thu, 20 Aug 2026 12:42:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.62 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787229754; cv=none; b=TouNazo5/HRrB1ClTYQJeSEZAPu/2K2wbKgBxW9WEqFluXUkAwhtRb7xB0ivMBHx9EbJgFzbaKg9q4Dcfbe1VefXt02O+Z64Ym/PJsMk6FHJV1HyYoksjzXO+exXn4DhJLKnJa7vviEjBCulzQpKDq8rHBHabxFJIjThigPh3iU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787229754; c=relaxed/simple; bh=xzuiCyOQkUshOw/dQoqpJd4cRH9nvcLkQjfLEBLwDso=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZSUDJWxjakOrUOcoZ/TTCCPR8ogCu7sd4GQGFK3Xj9qyYcJqZ8tjSmA8ZZA8fo0q+wxPJUEDZ1kiXF2qB2ouvpizpmd7dc/D1QF6Xxt6Y5PK4VaAmXllRx4JadfBz1RRL/I+wJk3EpGCsrr3ZVdQypImApBBgBIloHaZM55iA20= 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=pw4q/B8Y; arc=none smtp.client-ip=91.218.175.62 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="pw4q/B8Y" X-Envelope-To: linux-kernel@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=1787229750; v=1; x=1787834550; b=pw4q/B8Yr/DahBGnAs2/z9A6qeFb9DTCnbFKVy0F69whTIjperD6LyewZUvInvoadYqi7c1H rvJyNWoFW7XgIfvIOGo+tGck7IdkRV4ZsAOFLthBdO2VOBydgrQrWlxbZUthgsvC01MvLp+Qjr7 mMhXOQZAziZ5oEp9/rLH7rlQ= X-Envelope-To: linux-kernel@vger.kernel.org Received: from zgp.. (223.70.159.239) by smtp.migadu.com with ESMTPS id e10e27d3da9d99c5; Thu, 20 Aug 2026 12:42:30 +0000 X-Mizu-Trace-ID: e10e27d3da9d99c5 X-Migadu-Flow: FLOW_OUT From: Guopeng Zhang To: longman@redhat.com, cgroups@vger.kernel.org Cc: ridong.chen@linux.dev, tj@kernel.org, hannes@cmpxchg.org, mkoutny@suse.com, shuah@kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Guopeng Zhang Subject: [PATCH 03/17] selftests/cgroup: Test boot-isolated CPU partition release Date: Thu, 20 Aug 2026 20:41:48 +0800 Message-ID: <20260820124202.517160-4-guopeng.zhang@linux.dev> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260820124202.517160-1-guopeng.zhang@linux.dev> References: <20260820124202.517160-1-guopeng.zhang@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@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