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[2620:137:e000::1:20]) by mx.google.com with ESMTP id ds4-20020a170907724400b007828668662dsi2713428ejc.195.2022.09.23.04.22.51; Fri, 23 Sep 2022 04:23:18 -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=desiato.20200630 header.b=Z5pizHX2; 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 S231639AbiIWLFP (ORCPT + 99 others); Fri, 23 Sep 2022 07:05:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229578AbiIWLFH (ORCPT ); Fri, 23 Sep 2022 07:05:07 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 974CE2CC8B for ; Fri, 23 Sep 2022 04:05:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=32ensgDBOQz5xWHfSGKcwK3n4M02OBIJrH3OD6Cje10=; b=Z5pizHX2VGbREA8O0D7gIopoF2 kiHxX37/gciQBWP3z35OGsS6mj5KkStoMmwuJjnx+I9dSEmdcwEBQsNzT6Ju1s4Ks8J7vWyStLzto /b7h7D1lBtlJeWYUNcjHcAy+pVMdaSIGD235pV2nVTgUa40chOJAnXqttDeVxhDpbBHKANKLsFZ6y JNLWMY2DZUN6g1d/+kh4w8YwChtJ4pdW3ceRmUBzcDGlH7vrtT3kBooFBknhgOPxLxJ5e5zofXNaX JrDLqpg2euQF6NdzCbN5PyN2qfk64hbTy8jnT5ftEQSTE5zbTjGSSzEEVPoPMtefzyIT1p8b0Y8yS Vx8k1rmQ==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1obgUL-00FCYM-C3; Fri, 23 Sep 2022 11:04:57 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 6830A300074; Fri, 23 Sep 2022 13:04:56 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id DC8F3201D93FD; Fri, 23 Sep 2022 13:04:55 +0200 (CEST) Date: Fri, 23 Sep 2022 13:04:55 +0200 From: Peter Zijlstra To: Kassey Li Cc: mingo@redhat.com, linux-kernel@vger.kernel.org, quic_namajain@quicinc.com Subject: Re: [PATCH] kernel/hung_task: add option to ignore task Message-ID: References: <20220923085335.19593-1-quic_yingangl@quicinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220923085335.19593-1-quic_yingangl@quicinc.com> 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 Fri, Sep 23, 2022 at 04:53:35PM +0800, Kassey Li wrote: > By default, hung_task will iterate the tasklist and check > state in TASK_UNINTERRUPTIBLE with a given timeout value. > > Some tasks may in this state as expected but reported by hung_task. Please explain..