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 X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82DD2C4363A for ; Fri, 23 Oct 2020 13:58:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2CA2A20FC3 for ; Fri, 23 Oct 2020 13:58:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="QgLeO1dC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S373981AbgJWN6w (ORCPT ); Fri, 23 Oct 2020 09:58:52 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:26157 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S373833AbgJWN6w (ORCPT ); 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Fri, 23 Oct 2020 13:58:30 +0000 (UTC) Received: from [10.10.113.74] (ovpn-113-74.rdu2.redhat.com [10.10.113.74]) by smtp.corp.redhat.com (Postfix) with ESMTPS id CC92576643; Fri, 23 Oct 2020 13:57:54 +0000 (UTC) Subject: Re: [PATCH v4 2/4] sched/isolation: Extend nohz_full to isolate managed IRQs To: Frederic Weisbecker , Peter Zijlstra Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, intel-wired-lan@lists.osuosl.org, mtosatti@redhat.com, sassmann@redhat.com, jesse.brandeburg@intel.com, lihong.yang@intel.com, helgaas@kernel.org, jeffrey.t.kirsher@intel.com, jacob.e.keller@intel.com, jlelli@redhat.com, hch@infradead.org, bhelgaas@google.com, mike.marciniszyn@intel.com, dennis.dalessandro@intel.com, thomas.lendacky@amd.com, jiri@nvidia.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, lgoncalv@redhat.com, Thomas Gleixner References: <20200928183529.471328-1-nitesh@redhat.com> <20200928183529.471328-3-nitesh@redhat.com> <20201023132505.GZ2628@hirez.programming.kicks-ass.net> <20201023132950.GA47962@lothringen> From: Nitesh Narayan Lal Autocrypt: addr=nitesh@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20201023132950.GA47962@lothringen> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=nitesh@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="2ktHMrMxseM9vEwdga0WayDwzTpUc1mvq" Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --2ktHMrMxseM9vEwdga0WayDwzTpUc1mvq Content-Type: multipart/mixed; boundary="sV1FsSG3oRSUp4QUIelJW8R1co3r99GoG" --sV1FsSG3oRSUp4QUIelJW8R1co3r99GoG Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US On 10/23/20 9:29 AM, Frederic Weisbecker wrote: > On Fri, Oct 23, 2020 at 03:25:05PM +0200, Peter Zijlstra wrote: >> On Mon, Sep 28, 2020 at 02:35:27PM -0400, Nitesh Narayan Lal wrote: >>> Extend nohz_full feature set to include isolation from managed IRQS. Th= is >> So you say it's for managed-irqs, the feature is actually called >> MANAGED_IRQ, but, AFAICT, it does *NOT* in fact affect managed IRQs. >> >> Also, as per Thomas' earlier points, managed-irqs are in fact perfectly >> fine and don't need help at at... >> >>> is required specifically for setups that only uses nohz_full and still >>> requires isolation for maintaining lower latency for the listed CPUs. >>> >>> Suggested-by: Frederic Weisbecker > Ah and yes there is this tag :-p > > So that's my bad, I really thought this thing was about managed IRQ. > The problem is that I can't find a single documentation about them so I'm > too clueless on that matter. I am also confused with this terminology. So my bad for not taking care of this. --=20 Thanks Nitesh --sV1FsSG3oRSUp4QUIelJW8R1co3r99GoG-- --2ktHMrMxseM9vEwdga0WayDwzTpUc1mvq Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEkXcoRVGaqvbHPuAGo4ZA3AYyozkFAl+S4WEACgkQo4ZA3AYy ozmJIxAArjWqQ6WQ2t/TL7exwbOlYDx9CJmp6xiTVrQfq6w6GhtPemGgnnUbKjbD +KR3FTarDxi4Iv6A6SMzZ5m16LIwB0GrCCjrTB+/1kKD1SY3LyYXYujcoq6al1aL 3kcgdNt0cYTI8epiF3tuK/84IU1+tBkURSk8oYN1hQTDudmV/tvvwuSiWFsIT1wW 0G0SXBw6sLDG6tytRrIy/vDvlFi4qhYZ4PDTFpP2O1Z31ghsgQ9+upsf+I6M9+a6 yOhaEECXYGEXuXHFM3Be79qMQB2ho6soAG+v+n3ROEiHTf5dd7aiX8tJtxkntWXo q8dn1i4arIaYqRr1nIAHSQGNLMadLNq9DCbtn6RIRIf9axBfb816efJupsYv8pjc AYcTmDNVKFP8b+DWUKd61ATqhu1G51beoyy7PY7El26MIAtPLDIPn3KNBMJQqM/S lrpo63plXHjYlswlnCIRmXosOXgmLMPGQNxqjSQq+ZMQOAtBsTCOUj7+OIou/u0N YQhGp4Yoz2Y5ev7jmFHYn3UPL2UD3I8c2gh2cF5H7S7SlcbF+aB5aqV6W2supi5F Ece5FZDDJ0BnaSJAQbSZOi3Uog/JJUfULNC1Qf4MoHhcd4JGRPXLjPgDEssKKqCZ YWUDer6QxTH3Dygch0Rwi+QLMl6NlvjpEVyCWrngPXN5B1eW9nY= =u+sF -----END PGP SIGNATURE----- --2ktHMrMxseM9vEwdga0WayDwzTpUc1mvq--