From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F36BC225D7 for ; Wed, 17 Jan 2024 17:15:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705511718; cv=none; b=oaEQgKg8ZnES1Ise2mIE3x9fBYkDRsrGT2+mjsrf5awEi4EwRgkwSBgNd2vcAMglfLYbw0p8iR6+EEJ2WtpY69DQlgbszlCQifbowx1uuyFBnRCEzu2wGFecWf3Lx70jrdyAmia030aDiDZNB+eEv7fce/Dcz1koEkwDdCHnejw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705511718; c=relaxed/simple; bh=T7IslF0lI3yblMUodVhB9tJHIl2XHIH3degOHlEEIZ4=; h=DKIM-Signature:Received:X-MC-Unique:Received:Received:Message-ID: Date:MIME-Version:User-Agent:Subject:Content-Language:To:Cc: References:From:In-Reply-To:Content-Type:Content-Transfer-Encoding: X-Scanned-By; b=nHUXeo4eJG23tCw02lRlgLvWMUse6wnpMrM3ilmBh9HOtgp9MYibWjbYRk141vH56XSNQd1cmiUk0wdVVYuLElkrHtxA9zoL92gl1zggmIdrKd585gHcnY6xSsjBaFhe6k8sl2Nd8zp4TOkjDNiuPUrcvJF3Xd6ULKeHAgs+YWE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=OMwJq7qQ; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="OMwJq7qQ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1705511716; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gGm/eLi1COg3Vpc3apSqmPNHHb4PLdH7xLSc6T9224c=; b=OMwJq7qQNYswkJFMixz61wgUAQpFA16gjciNoqiOi9NMG/t4KHovf1cavQbQMJMnepdv8W xyT94yu8JFkYm31OiYfqb7Oc1IQloj0INja/Q1uD6ipougX2DS4zIJVvT0vJnVDtpfInYY cBWz4xWSvISFF0/3Q1xasvxuiOHU35M= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-631-7Yv0cQF3P-OKvQw7cQLm-g-1; Wed, 17 Jan 2024 12:15:11 -0500 X-MC-Unique: 7Yv0cQF3P-OKvQw7cQLm-g-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0782885CBA5; Wed, 17 Jan 2024 17:15:10 +0000 (UTC) Received: from [10.22.16.147] (unknown [10.22.16.147]) by smtp.corp.redhat.com (Postfix) with ESMTP id C7E4F2026D6F; Wed, 17 Jan 2024 17:15:07 +0000 (UTC) Message-ID: <5ee5bf79-6cdc-4d1b-a19f-f0d5165a5f16@redhat.com> Date: Wed, 17 Jan 2024 12:15:07 -0500 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 0/8] cgroup/cpuset: Support RCU_NOCB on isolated partitions Content-Language: en-US To: Tejun Heo Cc: Zefan Li , Johannes Weiner , Frederic Weisbecker , Jonathan Corbet , "Paul E. McKenney" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Davidlohr Bueso , Shuah Khan , cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, rcu@vger.kernel.org, linux-kselftest@vger.kernel.org, Mrunal Patel , Ryan Phillips , Brent Rowsell , Peter Hunt , Cestmir Kalina , Nicolas Saenz Julienne , Alex Gladkov , Marcelo Tosatti , Phil Auld , Paul Gortmaker , Daniel Bristot de Oliveira , Juri Lelli , Peter Zijlstra , Costa Shulyupin References: <20240117163511.88173-1-longman@redhat.com> From: Waiman Long In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 On 1/17/24 12:07, Tejun Heo wrote: > Hello, > > On Wed, Jan 17, 2024 at 11:35:03AM -0500, Waiman Long wrote: >> The first 2 patches are adopted from Federic with minor twists to fix >> merge conflicts and compilation issue. The rests are for implementing >> the new cpuset.cpus.isolation_full interface which is essentially a flag >> to globally enable or disable full CPU isolation on isolated partitions. > I think the interface is a bit premature. The cpuset partition feature is > already pretty restrictive and makes it really clear that it's to isolate > the CPUs. I think it'd be better to just enable all the isolation features > by default. If there are valid use cases which can't be served without > disabling some isolation features, we can worry about adding the interface > at that point. My current thought is to make isolated partitions act like isolcpus=domain, additional CPU isolation capabilities are optional and can be turned on using isolation_full. However, I am fine with making all these turned on by default if it is the consensus. Cheers, Longman