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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 0DED2C43381 for ; Thu, 7 Mar 2019 06:51:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CD7CA20675 for ; Thu, 7 Mar 2019 06:51:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="lq6rUGnM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726615AbfCGGvK (ORCPT ); Thu, 7 Mar 2019 01:51:10 -0500 Received: from mail-pg1-f193.google.com ([209.85.215.193]:40772 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726028AbfCGGvK (ORCPT ); Thu, 7 Mar 2019 01:51:10 -0500 Received: by mail-pg1-f193.google.com with SMTP id u9so10496910pgo.7; Wed, 06 Mar 2019 22:51:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=KcpAjxItQtRdfmbFR5ol1O8lZk07GyVE3FTdvbCP6S4=; b=lq6rUGnMtWNRwoD7/s6LPRVjHa03aGduQ/ILI1dSlzhfY5qjsFQ2/bL7KoKzKOuLJk VDVqw1j1RplNcBXAbHp12RaVKsR/NHslBuI9cvJddDFKg7Y4JzTnvbk3pgjdvvTsTrJS hONvQxuybOVp6YaY1Vf3wO9qNz8XQWIdob6uWakD7e4x6IsXerGqC6O/4oF9dbYte4PQ HygbFcmWWsGUtgLrIDuaWgIaAjYWkRSR6tYh24KVBrOnladykeiVaprJMQGwEwf4pPWY bqaQBljctMy6L7NE4Zv2gBG3xfIDeBTaikEAAt5RvNrvgxaiJlml6u/zH/Lgp3fPfxnW jXGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=KcpAjxItQtRdfmbFR5ol1O8lZk07GyVE3FTdvbCP6S4=; b=NF8uFW3b9yQEvh0BSKaOMhIPgJoUQUun3RT3w6FU37Iu5WI4oFM33v89EYKgBBs/vD CuYmsdJhxbtM93rpA+otA6+UmY3is+TrFJmOxO8/zWuuwjpTJofqfhp/CM3vM0vjuFt2 f5B9hsl5+7I85EgXATxVVGB8Qh6Aca7FB7THBPn130svvScyTGHWFcLFItqcLu1Y3JBQ 2g0Muc4i39MmXHTzWOEMD2FK2v3Kr6oVewN/quv38uQmAEg19bTmnhvqx0IJpao2/NoX OF8Hqf80Y0s1MA61WwAyHC8RZpYAeaecTcd5W6pcM/UiUkzGJtjKkIVHVXoyQDdIYjYv rOaQ== X-Gm-Message-State: APjAAAU85mTYjwG+icxdFtCXvxCXh084YN5P4eLZRpC83EulkQj+Y8OP 8DtSaUjg6Srm2RU2JA7mMx8= X-Google-Smtp-Source: APXvYqzBV722wiFTwTn1CWzfU2waOOzbqzpv3WqFLD6fCQoLaGadyRIEjjBnqdHhqa3fk3U72/iDag== X-Received: by 2002:a17:902:6b81:: with SMTP id p1mr11489620plk.106.1551941469761; Wed, 06 Mar 2019 22:51:09 -0800 (PST) Received: from localhost ([175.223.39.30]) by smtp.gmail.com with ESMTPSA id z18sm12202057pfl.164.2019.03.06.22.51.08 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 06 Mar 2019 22:51:09 -0800 (PST) Date: Thu, 7 Mar 2019 15:51:06 +0900 From: Sergey Senozhatsky To: Sergey Senozhatsky Cc: John Ogness , Petr Mladek , Sergey Senozhatsky , linux-kernel@vger.kernel.org, Peter Zijlstra , Steven Rostedt , Daniel Wang , Andrew Morton , Linus Torvalds , Greg Kroah-Hartman , Alan Cox , Jiri Slaby , Peter Feiner , linux-serial@vger.kernel.org Subject: Re: [RFC PATCH v1 08/25] printk: add ring buffer and kthread Message-ID: <20190307065106.GB425@jagdpanzerIV> References: <20190212143003.48446-1-john.ogness@linutronix.de> <20190212143003.48446-9-john.ogness@linutronix.de> <20190304073856.GA552@jagdpanzerIV> <20190304100044.GC21004@jagdpanzerIV> <20190304110703.GA960@tigerII.localdomain> <87o96p9gtx.fsf@linutronix.de> <20190306155701.wc22i2no5swdcids@pathway.suse.cz> <87r2bjbt47.fsf@linutronix.de> <87k1hbbq2m.fsf@linutronix.de> <20190307064152.GA425@jagdpanzerIV> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190307064152.GA425@jagdpanzerIV> User-Agent: Mutt/1.11.3 (2019-02-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (03/07/19 15:41), Sergey Senozhatsky wrote: > This sounds concerning. IMHO, netconsole is too important to rely > on preemptible printk and scheduler. Especially those netcons which > run in "report only when oops_in_progress" mode. Sometimes netconsole > is the fastest console available, but preemptible printk may turn it > into the slowest one. + oops may end by the time kthread becomes active. -ss