From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 867FEC2FC29 for ; Thu, 17 Aug 2023 13:27:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351423AbjHQN0x (ORCPT ); Thu, 17 Aug 2023 09:26:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48528 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348664AbjHQN0T (ORCPT ); Thu, 17 Aug 2023 09:26:19 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 28F03114 for ; Thu, 17 Aug 2023 06:25:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1692278731; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=EIvqGNiOYq+EPYGcgkwpvLebPIjD/Gcyc9aldSjDqvY=; b=LXRC2SKwPN96tE/NZzCtvp0/yERhKOok7KCHvkYDhqchpw8a0VV6AozvOHYTKT3KdxgFTQ mGMrxIPoibQ2eAG4Jx1ZhLGhBWECJDVxvlWtrMP9KUGT8kzmNzd3RlUAnm+QPJgBYxoqqs ppK0P3779DDAE0e/AwIm9AQ8vbadX/0= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-54-BciGRrdiN5G5BVx_7wn7Zg-1; Thu, 17 Aug 2023 09:25:29 -0400 X-MC-Unique: BciGRrdiN5G5BVx_7wn7Zg-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 563BA108BF02; Thu, 17 Aug 2023 13:25:11 +0000 (UTC) Received: from llong.com (unknown [10.22.16.215]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2171F492C13; Thu, 17 Aug 2023 13:25:10 +0000 (UTC) From: Waiman Long To: Tejun Heo , Zefan Li , Johannes Weiner , Christian Brauner , Jonathan Corbet , Shuah Khan Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Juri Lelli , Dietmar Eggemann , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Giuseppe Scrivano , Waiman Long Subject: [PATCH-cgroup v7 0/6] cgroup/cpuset: Support remote partitions Date: Thu, 17 Aug 2023 09:24:48 -0400 Message-Id: <20230817132454.755459-1-longman@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org v7: - Fix a compilation problem in patch 1 & a memory allocation bug in patch 2. - Change exclusive_cpus type to cpumask_var_t to match other cpumasks and make code more consistent. v6: - https://lore.kernel.org/lkml/20230713172601.3285847-1-longman@redhat.com/ - Add another read-only cpuset.cpus.exclusive.effective control file to expose the effective set of exclusive CPUs. - Update the documentation and test accordingly. v5: - https://lore.kernel.org/lkml/20230713172601.3285847-1-longman@redhat.com/ - Drop the first 4 patches as they had been merged. - Make cpuset.cpus.exclusive invariant once it is manually set. This also means the cpuset.cpus.exclusive may not show the effective value that is actually being used. - Update the documentation and test accordingly. This patch series introduces new cpuset control files "cpuset.cpus.exclusive" (read-write) and "cpuset.cpus.exclusive.effective" (read only) for better control of which exclusive CPUs are being distributed down the cgroup hierarchy for creating cpuset partition. Any one of the exclusive CPUs can only be distributed to at most one child cpuset. Invalid input to "cpuset.cpus.exclusive" that violates the sibling exclusivity rule will be rejected. This new control files has no effect on the behavior of the cpuset until it turns into a partition root. At that point, its effective CPUs will be set to its exclusive CPUs unless some of them are offline. This patch series also introduces a new category of cpuset partition called remote partitions. The existing partition category where the partition roots have to be clustered around the root cgroup in a hierarchical way is now referred to as local partitions. A remote partition can be formed far from the root cgroup with no partition root parent. While local partitions can be created without touching "cpuset.cpus.exclusive" as it can be set automatically if a cpuset becomes a local partition root. Properly setting "cpuset.cpus.exclusive" values down the hierarchy are required to create a remote partition. Both scheduling and isolated partitions can be formed as a remote partition. A local partition can be created under a remote partition. A remote partition, however, cannot be formed under a local partition for now. Modern container orchestration tools like Kubernetes use the cgroup hierarchy to manage different containers. And it is relying on other middleware like systemd to help managing it. If a container needs to use isolated CPUs, it is hard to get those with the local partitions as it will require the administrative parent cgroup to be a partition root too which tool like systemd may not be ready to manage. With this patch series, we allow the creation of remote partition far from the root. The container management tool can manage the "cpuset.cpus.exclusive" file without impacting the other cpuset files that are managed by other middlewares. Of course, invalid "cpuset.cpus.exclusive" values will be rejected. Waiman Long (6): cgroup/cpuset: Add cpuset.cpus.exclusive.effective for v2 cgroup/cpuset: Add cpuset.cpus.exclusive for v2 cgroup/cpuset: Introduce remote partition cgroup/cpuset: Check partition conflict with housekeeping setup cgroup/cpuset: Documentation update for partition cgroup/cpuset: Extend test_cpuset_prs.sh to test remote partition Documentation/admin-guide/cgroup-v2.rst | 123 +- kernel/cgroup/cpuset.c | 1253 ++++++++++++----- .../selftests/cgroup/test_cpuset_prs.sh | 431 ++++-- 3 files changed, 1317 insertions(+), 490 deletions(-) -- 2.31.1