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 815BA107B6 for ; Tue, 23 Jan 2024 05:50:54 +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=1705989056; cv=none; b=CXcThw1g7ABZlx9DUIFPhK7eVdmBG9+SLJ15Xxahh999RzU7HB7cGtzbDKyC7C8wk5g5L2QLfvIC5KIh7Tc+S3ArW9+T9cceeDSiQFCYmU714dChalUJGnN57Z5LQqxPO3WNebNqOGKr/89z3+M4rTxYW3swgsMIu76zKbF8y5g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705989056; c=relaxed/simple; bh=uUGqYPWkqLqAuYLajkHeoiaksi8vyt5EtObg/cfEv0A=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=k/ZFF3117wQgfVPxs9Af4h0b4jZ8QmJVrTermEsdo3WgNJLM7uxfGhD/f9zEA5wX/YQPn0tHtJJL3LCEUnLHCytKJqSpgizjugdHpG8nDKL9xIBcC8H1T/kseyO4E5NI6JwsuBSpfPM7z6Gxunerm8TUIX7/LJz2mDDx1rwTKE4= 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=Z0NbGXLf; 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="Z0NbGXLf" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1705989053; 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=H+rMK0KBBnQyaHb54gBf8clNL10ejkmGqcBgOHn7Pt4=; b=Z0NbGXLfHmfSnJ4Ib+7PmS9MzkuzU/hlity5AKjJ3fE7qIACf13zD4U9D0ODZ898R6NMRe vtP0b0cXbQ5jikgTKfqWNGyGsePiMWZPnz1taON9GUSCT2vezhdHI0qrGWezXYnyFtncwh OSI6ausLgbFE0RW9N8d4i88SDuP8TJs= 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-375-JHn3VzyfMY6lUkIpG0Vk8Q-1; Tue, 23 Jan 2024 00:50:48 -0500 X-MC-Unique: JHn3VzyfMY6lUkIpG0Vk8Q-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (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 9386885A588; Tue, 23 Jan 2024 05:50:46 +0000 (UTC) Received: from [10.22.8.107] (unknown [10.22.8.107]) by smtp.corp.redhat.com (Postfix) with ESMTP id D71B9492BC6; Tue, 23 Jan 2024 05:50:40 +0000 (UTC) Message-ID: <8075b1d2-1260-4f1d-a757-dc991d95710c@redhat.com> Date: Mon, 22 Jan 2024 21:50:40 -0800 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: =?UTF-8?Q?Michal_Koutn=C3=BD?= Cc: Tejun Heo , 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: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 On 1/22/24 10:07, Michal Koutný wrote: > Hello Waiman. > > On Wed, Jan 17, 2024 at 11:35:03AM -0500, Waiman Long wrote: >> This patch series is based on the RFC patch from Frederic [1]. Instead >> of offering RCU_NOCB as a separate option, it is now lumped into a >> root-only cpuset.cpus.isolation_full flag that will enable all the >> additional CPU isolation capabilities available for isolated partitions >> if set. RCU_NOCB is just the first one to this party. Additional dynamic >> CPU isolation capabilities will be added in the future. > IIUC this is similar to what I suggested back in the day and you didn't > consider it [1]. Do I read this right that you've changed your mind? I didn't said that we were not going to do this at the time. It's just that more evaluation will need to be done before we are going to do this. I was also looking to see if there were use cases where such capabilities were needed. Now I am aware that such use cases do exist and we should start looking into it. > > (It's fine if you did, I'm only asking to follow the heading of cpuset > controller.) OK, the title of the cover-letter may be too specific. I will make it more general in the next version. Cheers, Longman