From patchwork Mon Oct 18 14:36:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Waiman Long X-Patchwork-Id: 12566685 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B5A6C433F5 for ; Mon, 18 Oct 2021 14:37:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 30BDA60FD8 for ; Mon, 18 Oct 2021 14:37:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231795AbhJROjT (ORCPT ); Mon, 18 Oct 2021 10:39:19 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:30734 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231495AbhJROjS (ORCPT ); Mon, 18 Oct 2021 10:39:18 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1634567826; 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=Ng7Ch+ziTcXFMqpWwHpxE3VZVmB5z0SGbNUXf+BTCIE=; b=IDoOmXQE5NyR5ROBwkq/56v07jSvW7WlHVKIrx6ZcZNioH8EhmfYrgghNRtR8ADH66chol Q/c6MUZpIZgFSiSbcVzgYl6heNzoc3I5GkPb4ac/sfVDnf49UrFKfga66gbIeiDWg+3Y4d LhibcG8/cf7eb/exBkkd7gxIgot0iIM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-579-ipjXnTKoOA6L-Qk9B6HtqA-1; Mon, 18 Oct 2021 10:37:04 -0400 X-MC-Unique: ipjXnTKoOA6L-Qk9B6HtqA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 942E5801B1C; Mon, 18 Oct 2021 14:37:02 +0000 (UTC) Received: from llong.com (unknown [10.22.16.224]) by smtp.corp.redhat.com (Postfix) with ESMTP id A7A595F4EE; Mon, 18 Oct 2021 14:36:32 +0000 (UTC) From: Waiman Long To: Tejun Heo , Zefan Li , Johannes Weiner , Jonathan Corbet , Shuah Khan Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Andrew Morton , Roman Gushchin , Phil Auld , Peter Zijlstra , Juri Lelli , Frederic Weisbecker , Marcelo Tosatti , =?utf-8?q?Michal_Koutn=C3=BD?= , Waiman Long Subject: [PATCH v8 0/6] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus Date: Mon, 18 Oct 2021 10:36:13 -0400 Message-Id: <20211018143619.205065-1-longman@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org v8: - Reorganize the patch series and rationalize the features and constraints of a partition. - Update patch descriptions and documentation accordingly. v7: - Simplify the documentation patch (patch 5) as suggested by Tejun. - Fix a typo in patch 2 and improper commit log in patch 3. v6: - Remove duplicated tmpmask from update_prstate() which should fix the frame size too large problem reported by kernel test robot. This patchset makes four enhancements to the cpuset v2 code. Patch 1: Enable partition with no task to have empty cpuset.cpus.effective. Patch 2: Refining the features and constraints of a cpuset partition clarifying what changes are allowed. Patch 3: Add a new partition state "isolated" to create a partition root without load balancing. This is for handling intermitten workloads that have a strict low latency requirement. Patch 4: Enable the "cpuset.cpus.partition" file to show the reason that causes invalid partition like "root invalid (No cpu available due to hotplug)". Patch 5 updates the cgroup-v2.rst file accordingly. Patch 6 adds a new cpuset test to test the new cpuset partition code. Waiman Long (6): cgroup/cpuset: Allow no-task partition to have empty cpuset.cpus.effective cgroup/cpuset: Refining features and constraints of a partition cgroup/cpuset: Add a new isolated cpus.partition type cgroup/cpuset: Show invalid partition reason string cgroup/cpuset: Update description of cpuset.cpus.partition in cgroup-v2.rst kselftest/cgroup: Add cpuset v2 partition root state test Documentation/admin-guide/cgroup-v2.rst | 153 ++-- kernel/cgroup/cpuset.c | 393 +++++++---- tools/testing/selftests/cgroup/Makefile | 5 +- .../selftests/cgroup/test_cpuset_prs.sh | 664 ++++++++++++++++++ tools/testing/selftests/cgroup/wait_inotify.c | 87 +++ 5 files changed, 1115 insertions(+), 187 deletions(-) create mode 100755 tools/testing/selftests/cgroup/test_cpuset_prs.sh create mode 100644 tools/testing/selftests/cgroup/wait_inotify.c