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[209.132.180.67]) by mx.google.com with ESMTP id s4si5070185pgh.540.2019.03.04.03.07.52; Mon, 04 Mar 2019 03:08:08 -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=@gmail.com header.s=20161025 header.b=oVQ6duiG; 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=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726248AbfCDLHK (ORCPT + 99 others); Mon, 4 Mar 2019 06:07:10 -0500 Received: from mail-pf1-f193.google.com ([209.85.210.193]:35946 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726047AbfCDLHK (ORCPT ); Mon, 4 Mar 2019 06:07:10 -0500 Received: by mail-pf1-f193.google.com with SMTP id n22so2791831pfa.3; Mon, 04 Mar 2019 03:07:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:date:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=zoeAeqYklkUqXOCmIzigfy878m+qTOIptQmkrFFyueU=; b=oVQ6duiG56Vu7mROqEAJwdtE8wSWl+Khy+SGOWCc8Kin+rJIdaFMbhANKbZoHUDw+2 4HflajTBMXoQRiLPAIOpbJ3FRWXq/0HROgXSiSZGS5wwUAQdNHIaGMxNgYyvx0u3OnXz z69kq3PfPZZSK47JVXxEqcgvlKkv2XwUXaTygrwBe9w+qjYycIqp483W2EK6d7+pQnXE tcphz5j+CpvF/feVsgn8xrIIVXCiHUpN3DzIJHI68hWRMgSMlzy/XnAxewlaZjU1a7E/ 4L1CowyUMrGz8B62M8wDzFFAB1k04v32i8X3OsqU4ZyLeHs1LLm21Qj2RqqAqw2ko+l4 bcKg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=zoeAeqYklkUqXOCmIzigfy878m+qTOIptQmkrFFyueU=; b=KY+XjJavdokTeHQxdVXOTTo+exIu1sUzerH/zmXDEYx0rSBj3NJpmj3auNzeyq7hxk 1wpZTE5SLSwxIbwx/+EXGlHWIZ4MBEbpTgKvILWK9v2uTJ2Q/qTSWQzxSvyCsXim/a0r pg5vo+7AvDGePH3z37FMuM77X6f1Vaa4M1/iMrCyMRvtS8RWI6e17qMPSPuaDXFwhLd7 rU0KQC26OuF1WQzvvGMSYYDewuNdmC8Kt1IdFLRlG0dxSUtuQ0LaiVNt9gd4Wo1+4Ujt z9xezBWZU+0bhgRxkyWa1BJnpky72scsYMkPbRx+BD9J9vVWaLe/VZSwfdhcEbEGDNnA d1ug== X-Gm-Message-State: AHQUAuZIF8AMQ1JlPhprYP53y4lNBv2+KEKzrvlgNyjMZQ6cKGa4Ooxj /Qx8fO9E+ckEMh/zZz3QK3E= X-Received: by 2002:a62:ab04:: with SMTP id p4mr19450388pff.142.1551697629226; Mon, 04 Mar 2019 03:07:09 -0800 (PST) Received: from localhost ([121.137.63.184]) by smtp.gmail.com with ESMTPSA id f3sm7511310pfn.100.2019.03.04.03.07.07 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 04 Mar 2019 03:07:08 -0800 (PST) From: Sergey Senozhatsky X-Google-Original-From: Sergey Senozhatsky Date: Mon, 4 Mar 2019 20:07:03 +0900 To: John Ogness Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Petr Mladek , Steven Rostedt , Daniel Wang , Andrew Morton , Linus Torvalds , Greg Kroah-Hartman , Alan Cox , Jiri Slaby , Peter Feiner , linux-serial@vger.kernel.org, Sergey Senozhatsky , Sergey Senozhatsky Subject: Re: [RFC PATCH v1 08/25] printk: add ring buffer and kthread Message-ID: <20190304110703.GA960@tigerII.localdomain> References: <20190212143003.48446-1-john.ogness@linutronix.de> <20190212143003.48446-9-john.ogness@linutronix.de> <20190304073856.GA552@jagdpanzerIV> <20190304100044.GC21004@jagdpanzerIV> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190304100044.GC21004@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 (03/04/19 19:00), Sergey Senozhatsky wrote: > > But in general, channels which depend on preemptible printk will become > totally useless in some cases. > Which brings me to a question - what are those messages/channels? Not important enough to be printed on consoles immediately, yet important enough to pass the suppress_message_printing() check. We may wave those semi-important messages good bye, I'm afraid, preemptible printk will take care of it. So... do we have a case here? Do we really need printk-kthread? -ss