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[2620:137:e000::1:20]) by mx.google.com with ESMTP id c188-20020a6335c5000000b0041a512942ecsi21507678pga.427.2022.07.27.15.45.32; Wed, 27 Jul 2022 15:45:47 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=F2msVEIQ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233194AbiG0WCL (ORCPT + 99 others); Wed, 27 Jul 2022 18:02:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229628AbiG0WCI (ORCPT ); Wed, 27 Jul 2022 18:02:08 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 110BC4F650; Wed, 27 Jul 2022 15:02:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=BeBrPOLke6WzMWFWacFZZOXBlwbPMapBMRMcKarqkaM=; b=F2msVEIQ4j5C0MRFgckCahwZVf JpfYlCrIDWIKspHdCBCxjCBOf1bpGSMmTaH4HK6bGrVM9Xn6dKgpsteLMulCX1Rcn9INNsPGVnTnh LOKAlI1NOF8r7N5kF40HZzVXCOJMl4I6GJevS4FqJJu9cBCh8tm8yXyJObHmeKx0fU5ny/dewcX7F 7TSimFc41ONT5KnAznUR8LtwmIRw33Bq+j2qg20vG3FXHzfyenBLcQRt9kA4GdnIBlXIh5sXHzBwm W9Uxm8ECGDeaGChrsecHgk9KBtt8H9qG8Xdk892vi185o/6UhgH9BdOKfUJKbYQWB4OjRZUDw61L3 6ZuyH6Qw==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=worktop.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1oGp61-003Hce-O7; Wed, 27 Jul 2022 22:01:37 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id 9209C980403; Thu, 28 Jul 2022 00:01:35 +0200 (CEST) Date: Thu, 28 Jul 2022 00:01:35 +0200 From: Peter Zijlstra To: Tejun Heo Cc: Qais Yousef , Xuewen Yan , rafael@kernel.org, viresh.kumar@linaro.org, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, linux-kernel@vger.kernel.org, ke.wang@unisoc.com, xuewyan@foxmail.com, linux-pm@vger.kernel.org, Waiman Long Subject: Re: [PATCH] sched/schedutil: Fix deadlock between cpuset and cpu hotplug when using schedutil Message-ID: References: <20220705123705.764-1-xuewen.yan@unisoc.com> <20220711174629.uehfmqegcwn2lqzu@wubuntu> <20220712125702.yg4eqbaakvj56k6m@wubuntu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 12, 2022 at 06:13:46AM -1000, Tejun Heo wrote: > But now we're failing user-initiated operations randomly. I have a hard time > seeing that as an acceptable solution. There (sadly) is precedent for that; grep for "cpu_hotplug_disable".