From patchwork Sun Dec 5 18:32:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Waiman Long X-Patchwork-Id: 521087 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 CE798C433FE for ; Sun, 5 Dec 2021 18:32:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237166AbhLESgZ (ORCPT ); Sun, 5 Dec 2021 13:36:25 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:27338 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237151AbhLESgZ (ORCPT ); Sun, 5 Dec 2021 13:36:25 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1638729177; 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=ckklSfDz3nojQs2K22H6SivuEMKa8COQifCKiLedmKk=; b=iLnIG3ZxRsxnd++6yxKHDu3NLaAjaUZUTm+WaxBG0Vz1hd9BZPdQsDegJCU1rwieeKwV8m U53nxJhIYuqVj5XD0u07n5/lASsAhSk1/RVFMpJDSZDgnGIl8Y9wR/UMIwEIxUw2azO761 4sDkncSrxuFbcK7Nw66Bi6qvvMUsmdk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-458-L7rQEBuTPdq1pAYtFjuTfg-1; Sun, 05 Dec 2021 13:32:54 -0500 X-MC-Unique: L7rQEBuTPdq1pAYtFjuTfg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7022C81C9A6; Sun, 5 Dec 2021 18:32:52 +0000 (UTC) Received: from llong.com (unknown [10.22.32.89]) by smtp.corp.redhat.com (Postfix) with ESMTP id C3EA95BAE2; Sun, 5 Dec 2021 18:32:31 +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 v9 0/7] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus Date: Sun, 5 Dec 2021 13:32:13 -0500 Message-Id: <20211205183220.818872-1-longman@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org v9: - Add a new patch 1 to remove the child cpuset restriction on parent's "cpuset.cpus". - Relax initial root partition entry limitation to allow cpuset.cpus to overlap that of parent's. - An "isolated invalid" displayed type is added to cpuset.cpus.partition. - Resetting partition root to "member" will leave child partition root as invalid. - Update documentation and test accordingly. 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. This patchset includes one bug fix and four enhancements to the cpuset v2 code. Patch 1: Allow parent to set "cpuset.cpus" that may not be a superset of children's "cpuset.cpus" for default hierarchy. Patch 2: Enable partition with no task to have empty cpuset.cpus.effective. Patch 3: Refining the features and constraints of a cpuset partition clarifying what changes are allowed. Patch 4: 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 5: Enable the "cpuset.cpus.partition" file to show the reason that causes invalid partition like "root invalid (No cpu available due to hotplug)". Patch 6 updates the cgroup-v2.rst file accordingly. Patch 7 adds a new cpuset test to test the new cpuset partition code. Waiman Long (7): cgroup/cpuset: Don't let child cpusets restrict parent in default hierarchy 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 | 168 +++-- kernel/cgroup/cpuset.c | 440 +++++++----- tools/testing/selftests/cgroup/Makefile | 5 +- .../selftests/cgroup/test_cpuset_prs.sh | 667 ++++++++++++++++++ tools/testing/selftests/cgroup/wait_inotify.c | 87 +++ 5 files changed, 1142 insertions(+), 225 deletions(-) create mode 100755 tools/testing/selftests/cgroup/test_cpuset_prs.sh create mode 100644 tools/testing/selftests/cgroup/wait_inotify.c