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 7D509C43334 for ; Sat, 23 Jul 2022 05:16:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234356AbiGWFQ0 (ORCPT ); Sat, 23 Jul 2022 01:16:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40512 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229723AbiGWFQY (ORCPT ); Sat, 23 Jul 2022 01:16:24 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 897CF12ACD for ; Fri, 22 Jul 2022 22:16:23 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id bk6-20020a17090b080600b001f2138a2a7bso7613730pjb.1 for ; Fri, 22 Jul 2022 22:16:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=IDgKb9BFnubXrm8nhsbHpuMtogqppyRnkCcL1soD42Y=; b=ITLpKzWCCm+TJvDJ6q0kKJjw+YvIxJNA8z+SPLaB5RIW1thW64NDKtAY5RO/ztYdrb Inqt3oXw4e0OEhLMdLHJOilI4hfsGJGCJ23eh3sXVnVPJ/rGdQwi6/P2uu6791mVLOvW cwIPkt4o3TCRls3JJ2shQ7E5jgUlOKk97SnSlTkGSYR/ebc3s/SHUbTZS/WID+iflu6t e5p633A4ULYZzrakxf5Z86TubkR4VzX0lk+DCnkzBE6y6QpcCbniTdhQyg0kSOTSE/wn mTcD3hgbogHYddxyUMsslVE9nXbX7YPpR6oMhoOKn+Z0UxPlnMqp/nLootM/zyHzdJtf 0w5g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=IDgKb9BFnubXrm8nhsbHpuMtogqppyRnkCcL1soD42Y=; b=mrDbokt9I6UzSWmhqPbCmMwjBwtvMR6oMGJ8Mdne32hsbtdIHRcyRRltU7pv8nrEgr TSbs22bP8O79wlxgBwewacKD1S/UGrsdYDvnjcnn0c9P2rDcVdwq4mka5qjSnDDl3eE3 3c9tGsFSN/YocAEvxk9oIzgVc3m73D9BfBJd5v/l+Q3A8iPJnNMxzJEpEIrgD7sZ9g2d SaP7RR/u7N5loHVCRhe+l6qk5hmaQYWAYoaC76+piijupxl7jXlcJI+P73vrWjKOZN33 VJACufl8ZHQGncRvqsLGrr9boYUfZB1yz/mHBRkk64aDTVgOf9vluUuiwvpOx+mhOH6Q vWpg== X-Gm-Message-State: AJIora8/Ctcjuc5Nj4VfgQj0sGHr90MrER+DBaZmHwyXI8YWNVnmi71o Wx2O2d3hBtSGvL0MuNCg86E= X-Google-Smtp-Source: AGRyM1tBkHk5CU/4x+dfJekPgY9GiFCNed9f7jhcEP6MKPMRNgAzkrdpF+r7nVslMfJgMBiWS+03SA== X-Received: by 2002:a17:90b:4b4d:b0:1ef:a2c2:6bcc with SMTP id mi13-20020a17090b4b4d00b001efa2c26bccmr3321969pjb.186.1658553382689; Fri, 22 Jul 2022 22:16:22 -0700 (PDT) Received: from localhost ([2620:10d:c090:400::5:d97e]) by smtp.gmail.com with ESMTPSA id a9-20020a170902ecc900b001641b2d61d4sm1971584plh.30.2022.07.22.22.16.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Jul 2022 22:16:21 -0700 (PDT) Sender: Tejun Heo Date: Fri, 22 Jul 2022 19:16:20 -1000 From: Tejun Heo To: Valentin Schneider Cc: Lai Jiangshan , LKML , Peter Zijlstra , Frederic Weisbecker , Juri Lelli , Phil Auld , Marcelo Tosatti Subject: Re: [RFC PATCH] workqueue: Unbind workers before sending them to exit() Message-ID: References: <20220719165743.3409313-1-vschneid@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 21, 2022 at 02:53:43PM +0100, Valentin Schneider wrote: > > I think it needs something like task_set_cpumask_possible() which is > > documented as being usable in (raw) spinlocks and set the task's cpumask > > to cpu_possible_mask and let the later ttwu help migrate it to a > > proper non-isolated CPU or let it keep running. > > I'll see what I can come up with, thanks for the suggestion. Alternatively, we can just kill all the idle kworkers on isolated cpus at the end of the booting process. Thanks. -- tejun