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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1CAFDCA0EC3 for ; Mon, 11 Sep 2023 22:06:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355811AbjIKWCF (ORCPT ); Mon, 11 Sep 2023 18:02:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41082 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236209AbjIKJ5x (ORCPT ); Mon, 11 Sep 2023 05:57:53 -0400 Received: from jabberwock.ucw.cz (jabberwock.ucw.cz [46.255.230.98]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 072A1E67; Mon, 11 Sep 2023 02:57:49 -0700 (PDT) Received: by jabberwock.ucw.cz (Postfix, from userid 1017) id CE4371C0004; Mon, 11 Sep 2023 11:57:47 +0200 (CEST) Date: Mon, 11 Sep 2023 11:57:47 +0200 From: Pavel Machek To: Sasha Levin Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org, Tejun Heo Subject: Re: [PATCH AUTOSEL 4.19 12/14] workqueue: Call wq_update_unbound_numa() on all CPUs in NUMA node on CPU hotplug Message-ID: References: <20230909004045.3581014-1-sashal@kernel.org> <20230909004045.3581014-12-sashal@kernel.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="8J4fcvWLIF2OKCkg" Content-Disposition: inline In-Reply-To: <20230909004045.3581014-12-sashal@kernel.org> Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org --8J4fcvWLIF2OKCkg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! > When a CPU went online or offline, wq_update_unbound_numa() was called on= ly > on the CPU which was going up or down. This works fine because all CPUs on > the same NUMA node share the same pool_workqueue slot - one CPU updating = it > updates it for everyone in the node. >=20 > However, future changes will make each CPU use a separate pool_workqueue > even when they're sharing the same worker_pool, which requires updating > pool_workqueue's for all CPUs which may be sharing the same pool_workqueue > on hotplug. Yes, but we are not porting those future changes to stable, right? Please drop. BR, Pavel --=20 DENX Software Engineering GmbH, Managing Director: Erika Unter HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany --8J4fcvWLIF2OKCkg Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iF0EABECAB0WIQRPfPO7r0eAhk010v0w5/Bqldv68gUCZP7kmwAKCRAw5/Bqldv6 8kQaAKCveu4EhlskbQXvPfbu0S7DAWgihQCfbXge4GJr46GZ+Q5jsPQOv1RldeE= =8awX -----END PGP SIGNATURE----- --8J4fcvWLIF2OKCkg--