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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY 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 03FECC11F66 for ; Tue, 13 Jul 2021 01:43:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DF8316023D for ; Tue, 13 Jul 2021 01:43:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233713AbhGMBqC convert rfc822-to-8bit (ORCPT ); Mon, 12 Jul 2021 21:46:02 -0400 Received: from out30-45.freemail.mail.aliyun.com ([115.124.30.45]:53618 "EHLO out30-45.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230000AbhGMBqB (ORCPT ); Mon, 12 Jul 2021 21:46:01 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R951e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04394;MF=zhaoyan.liao@linux.alibaba.com;NM=1;PH=DS;RN=11;SR=0;TI=SMTPD_---0UfdImcp_1626140589; Received: from 30.43.68.19(mailfrom:zhaoyan.liao@linux.alibaba.com fp:SMTPD_---0UfdImcp_1626140589) by smtp.aliyun-inc.com(127.0.0.1); Tue, 13 Jul 2021 09:43:10 +0800 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.40.0.2.32\)) Subject: Re: [PATCH] use 64bit timer for hpet From: Linux In-Reply-To: <875yxgngct.ffs@nanos.tec.linutronix.de> Date: Tue, 13 Jul 2021 09:43:09 +0800 Cc: mingo@redhat.com, hpa@zytor.com, dwmw@amazon.co.uk, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, songmuchun@bytedance.com, likunkun@bytedance.com, guancheng.rjk@alibaba-inc.com, duanxiongchun@bytedance.com, wenan.mao@linux.alibaba.com Content-Transfer-Encoding: 8BIT Message-Id: References: <1625213625-25745-1-git-send-email-zhaoyan.liao@linux.alibaba.com> <875yxmqw2s.ffs@nanos.tec.linutronix.de> <8A96C0F7-FBE4-4B23-8565-E814401BF927@linux.alibaba.com> <87o8bdoy11.ffs@nanos.tec.linutronix.de> <2CC6F5DA-B186-4A06-92B4-B763386F0D0A@linux.alibaba.com> <875yxgngct.ffs@nanos.tec.linutronix.de> To: Thomas Gleixner X-Mailer: Apple Mail (2.3654.40.0.2.32) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org OK, Thank you for your patience. the last question: > I forgot the details, but when I tried moving HPET to 64bit it did not > work on one of my machines due to an erratum and other people reported > similar issues on different CPUs/chipsets. > > TBH, I'm not interested at all to chase down these buggy implementations > and have yet another pile of quirks. Can you tell me the erranum or issue link at that time? This is very important to us. Thank you very much. > 2021年7月12日 下午3:25，Thomas Gleixner 写道： > > Liao, > > On Mon, Jul 12 2021 at 12:52, Linux wrote: >>> Sorry, keeping the softirq from running for 3 minutes is simply out of >>> spec. If the sysadmin decides to do so, then he can keep the pieces. >> >> It is because the kernel thread is busy that the clocksource_watchdog >> thread is not scheduled, not softirq. > > Which thread? > > The clocksource watchdog runs from a timer_list timer callback in > softirq context. Even if the softirq is switched to the softirq thread > then still my argument of starving that for 3 minutes still stands. > > This is _not_ a kernel problem. Overcommitment is a admin problem. > > Thanks, > > tglx