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=-2.5 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 2DBC8C67839 for ; Thu, 13 Dec 2018 02:27:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DE17020989 for ; Thu, 13 Dec 2018 02:27:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="VqwbHJR7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DE17020989 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726552AbeLMC1I (ORCPT ); Wed, 12 Dec 2018 21:27:08 -0500 Received: from mail-pg1-f195.google.com ([209.85.215.195]:46650 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726344AbeLMC1I (ORCPT ); Wed, 12 Dec 2018 21:27:08 -0500 Received: by mail-pg1-f195.google.com with SMTP id w7so260189pgp.13; Wed, 12 Dec 2018 18:27:07 -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=B30mj1VTeQgMqk/ISecY1mlTAHqqBe/7hdJ8y9OTzQo=; b=VqwbHJR7zA1Jg3E08K6blRcxsgZsk4TehQ2xblTx/67GgLUl1vC8BhL1BEAIWTzPle VQBZOlPizW+nyE3zeywse7giELsQZ/qoKMElPTzbkyO2OWlCLEdk10PnZan8DwuzHwne BPcyzqBFEzJRhQgO4OjrfB9dbPgsL7MWdSaEAiMMZIPKeHtCbFo4DfzC2F0ZMl2pCXg/ WRgsxfID2OoOTA0TXONRSYmW2vWZa/FAy6+5r49jWfYMywJldFNssTPtO0FwJve0gx8f b+7m1pEMaNXMZvZuxqRu0YvYO9yDZVIV51kNEXg104eXaGVt8DLaSxfPxbPzKP2hYbbd PTvw== 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=B30mj1VTeQgMqk/ISecY1mlTAHqqBe/7hdJ8y9OTzQo=; b=BlL/yrk+rSBsvBk+UkuVbskpqf6OMqZD2O+/WurOW+IyPWcXd6iNG+Fptnym4AW/VT R2yDR05s07Gq6kseDS+2387cNItlH+tK32ALJckRekNoZwqMmwJxM8zTb/BEBifY0GE7 iwio4cmxAmPmBNcO9VVsMTlAsVKSsU2FCSX7eVgK06WhFh4OFvKIeClJmMccRgbsMdZR 0Z/05svR/h2EusSrcCJYydRgOdr3v95T6UdsP9ZS5+h49E4xAl7Z6xE8aKg/pn0EJn6H 9h97Oih3dsqAJP4ur8sWcA87HklBXqGphiysxYKZwG44Oc7aXp4VRGJwgCmIvGWnvs6w qyVw== X-Gm-Message-State: AA+aEWbCfrLx4K/U2OulkHWKbS0GTwqbdi3UBYICYXheiiPOWBiYZwb9 GyV20eLeCZnuTfgbrd4ftwU= X-Google-Smtp-Source: AFSGD/W4eJNuT96yxtPj9IxPfe8UNSA5IKg+BCbe0kqoow9hjaMFHLoItIDD8CKwjNl/CFB6JNudGA== X-Received: by 2002:a62:3a04:: with SMTP id h4mr22262641pfa.119.1544668027536; Wed, 12 Dec 2018 18:27:07 -0800 (PST) Received: from localhost ([110.70.59.213]) by smtp.gmail.com with ESMTPSA id f32sm323076pgf.80.2018.12.12.18.27.05 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 12 Dec 2018 18:27:06 -0800 (PST) Date: Thu, 13 Dec 2018 11:27:03 +0900 From: Sergey Senozhatsky To: Daniel Wang Cc: Sasha Levin , Sergey Senozhatsky , Petr Mladek , Sergey Senozhatsky , Steven Rostedt , stable@vger.kernel.org, Alexander.Levin@microsoft.com, Andrew Morton , byungchul.park@lge.com, dave.hansen@intel.com, hannes@cmpxchg.org, jack@suse.cz, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Mathieu Desnoyers , Mel Gorman , mhocko@kernel.org, pavel@ucw.cz, penguin-kernel@i-love.sakura.ne.jp, Peter Zijlstra , tj@kernel.org, Linus Torvalds , vbabka@suse.cz, Cong Wang , Peter Feiner Subject: Re: 4.14 backport request for dbdda842fe96f: "printk: Add console owner and waiter logic to load balance console writes" Message-ID: <20181213022703.GD4860@jagdpanzerIV> References: <20181212081034.GA32687@jagdpanzerIV> <20181212133603.yyu2zvw7g454zdqd@pathway.suse.cz> <20181212135939.GA10170@tigerII.localdomain> <20181212174333.GC2746@sasha-vm> <20181212214337.GD2746@sasha-vm> <20181212215225.GE2746@sasha-vm> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.1 (2018-12-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (12/12/18 16:40), Daniel Wang wrote: > In case this was buried in previous messages, the commit I'd like to > get backported to 4.14 is dbdda842fe96f: printk: Add console owner and > waiter logic to load balance console writes. But another followup > patch that fixes a bug in that patch is also required. That is > c14376de3a1b: printk: Wake klogd when passing console_lock owner. Additionally, for dbdda842fe96f to work as expected we really need fd5f7cde1b85d4c. Otherwise printk() can schedule under console_sem and console_owner, which will deactivate the "load balance" logic. -ss