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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS 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 16E95C2B9F2 for ; Sat, 22 May 2021 21:51:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA71F61177 for ; Sat, 22 May 2021 21:51:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231450AbhEVVwy (ORCPT ); Sat, 22 May 2021 17:52:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:49004 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231398AbhEVVwx (ORCPT ); Sat, 22 May 2021 17:52:53 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 264A461182; Sat, 22 May 2021 21:51:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1621720288; bh=MVoSzpLlxUOzEdfjJRbdh/pcPsg3zH2/R6Cg3GE2BqU=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=CcrQTUD0iNMh9uqRCYKDE3rUcTM6gdwgpdj0aPPsJX5zsB+H9npnftceHCABUfmec geoDKMNzS4q3cdVXp/AzyXolxjKj2qszjSrYABv78/ntE/cks2ym33kSHOFxOiT0iJ tcyLrtWMudPgkorkc26P1h2ZgbhvOYRU91AszD/0= Date: Sat, 22 May 2021 14:51:27 -0700 From: Andrew Morton To: chenguanyou Cc: linux-kernel@vger.kernel.org, keescook@chromium.org, mhocko@suse.com, lukas.bulwahn@gmail.com, vbabka@suse.cz, gpiccoli@canonical.com, chenguanyou Subject: Re: [PATCH] hungtask: add filter kthread/check comm Message-Id: <20210522145127.5f56751f164df8af2d3f39fa@linux-foundation.org> In-Reply-To: <20210521132544.19816-1-chenguanyou@xiaomi.com> References: <20210521132544.19816-1-chenguanyou@xiaomi.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 21 May 2021 21:25:44 +0800 chenguanyou wrote: > Some kernel threads are always in D state, when we enable hung_task, > it will misjudge, we should skip these to narrow the scope. > > exp mtk mobilephone: > root 435 435 2 0 0 mtk_lpm_monitor_thread 0 D LPM-0 > root 436 436 2 0 0 mtk_lpm_monitor_thread 0 D LPM-1 > root 437 437 2 0 0 mtk_lpm_monitor_thread 0 D LPM-2 > root 438 438 2 0 0 mtk_lpm_monitor_thread 0 D LPM-3 > root 439 439 2 0 0 mtk_lpm_monitor_thread 0 D LPM-4 > root 440 440 2 0 0 mtk_lpm_monitor_thread 0 D LPM-5 > root 441 441 2 0 0 mtk_lpm_monitor_thread 0 D LPM-6 > root 442 442 2 0 0 mtk_lpm_monitor_thread 0 D LPM-7 Maybe convert these threads to use TASK_IDLE?