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[209.132.180.67]) by mx.google.com with ESMTP id z9si465006pgf.54.2018.12.12.18.41.57; Wed, 12 Dec 2018 18:42:17 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=gj6EOCMg; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726717AbeLMCkD (ORCPT + 99 others); Wed, 12 Dec 2018 21:40:03 -0500 Received: from mail-it1-f195.google.com ([209.85.166.195]:37998 "EHLO mail-it1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726453AbeLMCkC (ORCPT ); Wed, 12 Dec 2018 21:40:02 -0500 Received: by mail-it1-f195.google.com with SMTP id h65so1617289ith.3 for ; Wed, 12 Dec 2018 18:40:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=B5bGKvlvkuY64J0iK6Ja4HOR/V42MJkGgtxmR3c5eU8=; b=gj6EOCMgIh/1pItaVcAnI+sUtCAXIV/H5cmwxZF9548B/tfXmGyHY/kaxFk94Bj4wR nGdsoNLzxxj2Syhg/v7pw/Il/XORzLMSSV5q8RlregJaLV4jeY4xmAu2zIqdmGi90cdA fZhaNzx/iQXPaMMYgusu4ohbsUnOmvTR2u2ZrE7I7IbsB+rHEjugdS14TMZQoYV9JyCR 5pk63/DsNjWp/0bjLcmJNO27CRSjXP7sV7XN4Xyb6KFfSMAqqEZBX6izX348oQBp9xft DBUaH4KAD7VsEeJ31Sie6ZtTwBMcUGsqmxzNuLM+bXP7MDTcQcbsqe53EE0fNfGaPGwZ 7SmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=B5bGKvlvkuY64J0iK6Ja4HOR/V42MJkGgtxmR3c5eU8=; b=HEfJ+SPjHa0WkwYEKk20vsgW9s3lwI0deNs3/5ixw5isFuUjZ1uNoN/VRQ5yLshDRA igrYxvW3nHU6ZVELf2egYg1h0AfJQffSoNfNs0k67OBOSO1ncdoZYlrtZR4LwXtCiL0t ln42fKxgnfiltY5lFCxR4TYZzY5LldK3Glv6MNA+P955tm3Mt7iiMW0WTiCLSxgMH+Kh n/tnJ1cdrvhmxxt0KF8NsFU/h5bdxT8URgWA/hXyUf5zlfXEmZwoBVUVOeJY/NypVOPO 3F/VFXkIL6DhHy7jj8OAAVTK61FElVjDClsM2OQififOXVLpY2vuJvj23lZeOOR9ZmeN oRbA== X-Gm-Message-State: AA+aEWbWjWvz2CK6CmyP6mg3cxEwbn8Bq71Tw4lPbtcW/QVDRhHSAVzu tsVIB41rS9fhRSBImcpsyWnjmLJDPS5Rk/ZjEvBEaQ== X-Received: by 2002:a24:97c3:: with SMTP id k186mr3552289ite.125.1544668801268; Wed, 12 Dec 2018 18:40:01 -0800 (PST) MIME-Version: 1.0 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> <20181213022703.GD4860@jagdpanzerIV> In-Reply-To: <20181213022703.GD4860@jagdpanzerIV> From: Daniel Wang Date: Wed, 12 Dec 2018 18:39:42 -0800 Message-ID: Subject: Re: 4.14 backport request for dbdda842fe96f: "printk: Add console owner and waiter logic to load balance console writes" To: Sergey Senozhatsky Cc: Sasha Levin , Sergey Senozhatsky , Petr Mladek , 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 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000003753c2057cde3b89" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0000000000003753c2057cde3b89 Content-Type: text/plain; charset="UTF-8" > 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. It looks like fd5f7cde1b85d4c got into 4.14.82 that was released last month. On Wed, Dec 12, 2018 at 6:27 PM Sergey Senozhatsky wrote: > > 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 -- Best, Daniel --0000000000003753c2057cde3b89 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIS7QYJKoZIhvcNAQcCoIIS3jCCEtoCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg ghBTMIIEXDCCA0SgAwIBAgIOSBtqDm4P/739RPqw/wcwDQYJKoZIhvcNAQELBQAwZDELMAkGA1UE BhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExOjA4BgNVBAMTMUdsb2JhbFNpZ24gUGVy c29uYWxTaWduIFBhcnRuZXJzIENBIC0gU0hBMjU2IC0gRzIwHhcNMTYwNjE1MDAwMDAwWhcNMjEw NjE1MDAwMDAwWjBMMQswCQYDVQQGEwJCRTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEiMCAG A1UEAxMZR2xvYmFsU2lnbiBIViBTL01JTUUgQ0EgMTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC AQoCggEBALR23lKtjlZW/17kthzYcMHHKFgywfc4vLIjfq42NmMWbXkNUabIgS8KX4PnIFsTlD6F GO2fqnsTygvYPFBSMX4OCFtJXoikP2CQlEvO7WooyE94tqmqD+w0YtyP2IB5j4KvOIeNv1Gbnnes 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