From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f41.google.com (mail-io1-f41.google.com [209.85.166.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A60F11C2E for ; Thu, 5 Sep 2024 18:34:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.41 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725561288; cv=none; b=RgmXFODevwv5vpjzb2HS8kuNPFvJ9kg0+8e/167dULnq8ld64Q2Wrc/UqU/XKjIa1T8ccrY+Z9R1tjcqQ9mWk0uRzveVKDTjCIvtagdTBwfpk9bHMfz1yEaNXZU53l8y/5qU0YwWv4CkPCU7Y1EF6khhlWvDTPgiMtVYFGeQ6No= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725561288; c=relaxed/simple; bh=wku7BF7FPEUKajciySgUaEhihmowhV+puGzrctVB6Ys=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=XFf0P9tMiQAl0GdzynobwZzt50/bboL8VMXthnTHMGNCY3o9hNs+tHhn63dMhi3xWnzpOSMA8qvAVI6DBOthy65DrMdxrlcMi8Qo3wBtsaIqh8xdHT3qFbdYha9ev7tS1p2J7fRfBznmsXD60SUas5jW0BMFCGbOR6awxWzsCVY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk; spf=pass smtp.mailfrom=kernel.dk; dkim=pass (2048-bit key) header.d=kernel-dk.20230601.gappssmtp.com header.i=@kernel-dk.20230601.gappssmtp.com header.b=ziETT3Ir; arc=none smtp.client-ip=209.85.166.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kernel.dk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20230601.gappssmtp.com header.i=@kernel-dk.20230601.gappssmtp.com header.b="ziETT3Ir" Received: by mail-io1-f41.google.com with SMTP id ca18e2360f4ac-82a238e0a9cso47194739f.3 for ; Thu, 05 Sep 2024 11:34:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20230601.gappssmtp.com; s=20230601; t=1725561283; x=1726166083; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=aQ8391DK8+LhiYv94yWR8zy/yMdB9Y/ds/lDuepT0f0=; b=ziETT3IrKvwz26u5g63/MNUOqGsbXMIAT5Dlq4x75CCO1iZT6KgEOdc4mZvbUscgAp URWcPJVX2BD9Z3aZ16cqUuDPmddss4P+5Qr1233sH7s++uSHf9XR6nQk7UiaUw/D6BCg d55/7OhSKJ5mTZ1NrC+r5hRATtXRgpNOhvsb4YBkh8HPbi4mN0YCXCBrcSeSGotzPMut Xl+l6dcZRpiQql+Oc/BSKURg7nQPKKHq6iHxoV0+Vks8i6xpziQ7CBBB4z0+4tqu+R5X ssvD86ZucnpsRXdbjI3A6OSybwuxI5//NRdne9dodq4acLOep3uAWbYjmNXYqSLSde2F 92+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725561283; x=1726166083; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=aQ8391DK8+LhiYv94yWR8zy/yMdB9Y/ds/lDuepT0f0=; b=QeFt3reErRrUvRxu9wpdV4MycbS5QbG5AOxzBCsMDVZWIYy+WJ8txTVO5ZAXenbvJk Wp4LQ3/CT1/4dLJO+Ui8I/m1nGf6tBIeULuK9Mc6tT+idzCTa7GRjumUt9IOHZ3ySsgm 6ImSyZcqazM9W3tlamIPDzRYyRS0YskfGPSAd8tB369UCPNX27ErlYcELEzTw/JC9gTf ZNJjR3ogkSiTxPNE1MOd1h3hNwnWGlTHkTeWoZ/ibyXyWdAvEuVQ7/juTyrHPmtWlDgL v4dqTc+fjDEMOHr++Q52MltEXUxmUc72+KZsISPgPx4wHKGaGcPfeQb+n8O947+9HfzF Q48Q== X-Forwarded-Encrypted: i=1; AJvYcCUBuAr2BtVVwTLGySa2uqgdkbRNW5ZCRALMIivokDpOWOHLMsJ1Wt2IZPMd4YrDanHFEb+1khYRrUXagg==@vger.kernel.org X-Gm-Message-State: AOJu0YwJTS/xV4qTguJuG8gx2Iql67G9R/XawN2k7eZDxchVYViGvdpA 6VOKL6XcI0rCmeIa/Fnse3mbjks6emHiw7a6nbEnDMrCfUUZt5AUy7WyI/4Ad2g= X-Google-Smtp-Source: AGHT+IFmvbX98n0yRYn//FzC53rES2JwLSzR1RckucL1DhKvBiaGhW/h7lG6kCPMW6VWPirCzb7jaA== X-Received: by 2002:a05:6602:15cc:b0:82a:306b:950d with SMTP id ca18e2360f4ac-82a5ed0d8a7mr1598540239f.12.1725561283336; Thu, 05 Sep 2024 11:34:43 -0700 (PDT) Received: from [192.168.1.116] ([96.43.243.2]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-4ced2eb17basm3664018173.155.2024.09.05.11.34.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Sep 2024 11:34:42 -0700 (PDT) Message-ID: <5e19d14b-1ef7-4022-a3a7-e2c1d5001f65@kernel.dk> Date: Thu, 5 Sep 2024 12:34:41 -0600 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] MAINTAINERS: move the BFQ io scheduler to orphan state To: Linus Walleij Cc: Ulf Hansson , Paolo Valente , "linux-block@vger.kernel.org" References: <6fe53222-876c-4deb-b4e1-453eb689a9f3@kernel.dk> <805c9f7b-49fb-444e-a81d-5b9d457bf262@kernel.dk> Content-Language: en-US From: Jens Axboe In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/5/24 12:05 PM, Linus Walleij wrote: > On Thu, Sep 5, 2024 at 4:58?PM Jens Axboe wrote: >> On 9/5/24 7:03 AM, Linus Walleij wrote: > >>> Which production? For singlequeue devices it is pretty widespread. >> >> We tried it at one point internally at Meta, and it was not pretty. > > I didn't know you used any singlequeue devices. > > If you used it on multiqueue devices, well that can't be recommended. Of course we have single queue devices, anything that isn't nvme is basically single queue. >>> Maybe we should propose these rules to the main udev repository >>> so that they also go into Debian and we get even wider use? >> >> I know you like to push for it to be the default, and I always push back >> because I don't think it's stable enough for that, and now we have the >> added complication that it hasn't been maintained for quite a while. >> So no, I don't think so. > > The reason I like it personally is that it has actually saved me from > crashing my machine by preserving interactivity on a (single queue) > device: > https://people.kernel.org/linusw/bfq-saved-me-from-thrashing I'd consider that largely anecdotal at this point. > For Androids and chromebooks it keeps the device interactive > during heavy disk (eMMC) activity, such as when Android > updates a pile of apps (.apk files). I'm somewhat dubious that that problem could not be solved in a much simpler way than what is BFQ. -- Jens Axboe