Received: by 2002:a89:d88:0:b0:1fa:5c73:8e2d with SMTP id eb8csp2661660lqb; Tue, 28 May 2024 06:57:48 -0700 (PDT) X-Forwarded-Encrypted: i=3; AJvYcCV4yWjgM2G36BdYPpBfN9Y1q8Nov3LP/V/aK0q1R93L10y68QNNAaULMcEVIjci6ayfL0DAbyxtIcZ1piHRcBPXuv1hQTDyVnu+HIDjlw== X-Google-Smtp-Source: AGHT+IGK7+Un+f4CZMG+WBwYy7jIDFnIQT9+gDjzfxpaTeLpTkv+jlb8akAFIxoBiTU1WrIGGQsh X-Received: by 2002:a50:c35d:0:b0:578:57b9:8e13 with SMTP id 4fb4d7f45d1cf-57861d60208mr10015794a12.10.1716904667988; Tue, 28 May 2024 06:57:47 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1716904667; cv=pass; d=google.com; s=arc-20160816; b=hXYo6PP0pzUtl3l6PtXecptUBMX8VJd2aTjKKPyEsPLiqeGAj2YojGq1wEK3mRj53c LPmXAaIpqM0O/FSSmO/KqBMopNuh5ZYjhIp1EHafAU5bU9jCeJFT4xDzwSiju4+J3LW+ O8cyDwb8T7eQTFyWdh+0JtV5HLxtLpyY+/hbStdfmfy0ceSnNslygtcP2EA7q9HYYOOM BX8KFNYghzo4ky1KXKGCVcej/nr+/yKPte6MNgmnDjpA/7a9zeo4Ot4UmLR8cAH0xRj4 /iXcC6w/7xa+Yfl3ANJAWwU2jVwceZkcJE9AnCqcFIpk6EthL0tG9azpaZ8fJqAhBSn2 Gb3g== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=in-reply-to:content-disposition:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:message-id:subject:cc :to:from:date:dkim-signature; bh=4s2+SoCd+hCES+4mr97S7Vwnc2NrQ4b33WmHNmjp2/U=; fh=TQ/fO2x3ZF2zoPxZrvGSD5yNpiDTDbRUGQmKSjZnHX0=; b=a24Y3ZaFL7GbGSzyZKg+09Zsvp47m5Kt58zNtewJxNZAZGIxP2zH0YNvX/J8+W4TrV Q38SKm6j62slqW039bosCiaF/FdK1TgtFxyQHtSQ2ku1DuHCLfmqJxO3nmf6UdbywV8S 0PI3R3stN0urbycFEklN+d/Dq8DUvsOvLATN94mnFBadZwdCfLtOqZ7+YbusuS+UtLfZ p59tYVV0s/B1v4YVqrPK08vBdmminQSYC24kPcqADVRNVgFPvgAY6Z8bjuEHFdMSxVma k8vf3Vbk7pcvs8UFMyIaYYB/ZQCr+VsdSpcuN7IIIaE77q4Wv51o9Fo3c+YRXDlQjYoP /3VQ==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20210309 header.b=CH3dxB++; arc=pass (i=1 dkim=pass dkdomain=infradead.org); spf=pass (google.com: domain of linux-kernel+bounces-192144-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) smtp.mailfrom="linux-kernel+bounces-192144-linux.lists.archive=gmail.com@vger.kernel.org" Return-Path: Received: from am.mirrors.kernel.org (am.mirrors.kernel.org. [2604:1380:4601:e00::3]) by mx.google.com with ESMTPS id 4fb4d7f45d1cf-579c4477891si3257709a12.525.2024.05.28.06.57.47 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 May 2024 06:57:47 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel+bounces-192144-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20210309 header.b=CH3dxB++; arc=pass (i=1 dkim=pass dkdomain=infradead.org); spf=pass (google.com: domain of linux-kernel+bounces-192144-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) smtp.mailfrom="linux-kernel+bounces-192144-linux.lists.archive=gmail.com@vger.kernel.org" Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by am.mirrors.kernel.org (Postfix) with ESMTPS id E018E1F223DA for ; Tue, 28 May 2024 10:57:53 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 28F0B16C688; Tue, 28 May 2024 10:57:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="CH3dxB++" Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4C2CA16B757; Tue, 28 May 2024 10:57:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716893864; cv=none; b=mC+vUduPaxHp/ad4KqnxZIoo8ijxIPD3KBPyz1MONd+LumtPOOYj+zawXQyYBN3VzfbJvqBAcNX7W9D+kIWAFaGorq7kuvf2/h4d7hDFErW0twNOA0dSrTpfcwh5SGORaX7oxQRZFNnbumiDLEWWfqmISlH4Zl5cHB/Uly0CWGw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716893864; c=relaxed/simple; bh=c/m3xEKbhpp6m/KzhlgzeEJVnfxcnQAyQ9VW4N9I1mU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=siHnlC93RfwWLjgmj9AnYpXBxaDieeD/bn3acP1r8tQi17DmW1WIURhyJAS8TXlVgwjNztlz/l1yaZsfu3Ku8wardNoGCUuVSXYHKEAkcswRYBXEtU5lYsGszL1kGiQYwlt6Ksx/eV92Oc/zoErV+S+U/keCWGIjiBnY+hICAs0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=CH3dxB++; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=4s2+SoCd+hCES+4mr97S7Vwnc2NrQ4b33WmHNmjp2/U=; b=CH3dxB++PZES5GIV/UuDLIINgO B6TiEaGCFVxfyo6mpn3mKyp+cmGGc7tSgWSxpcJZ7pbS87sgua+0jMBpwYt1hlKsCdHUvXxL3ACtm lcit36iv6j4Vhr95wu3aegbCU8z64S/zQo+XbbCEmkyYhMHp77ZMNGnGDDurVZiS7kV2ReXU72eVd mvynILZhQXcfPqOpse7ZM5N6njDPhKML1k4VERQe4PVsdaR/7LSqQjt0StWuFN7C1HocinGHowM6d TLBEMgP56CiPH3GWXFcXYZKJifsnUWIJ2xZkj8WrWyY51x5celVdE7AZHWigqS61/ZF0cmUb4/rbM SuSI9RCQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1sBuWR-00000000I0E-3DIG; Tue, 28 May 2024 10:57:39 +0000 Date: Tue, 28 May 2024 03:57:39 -0700 From: Christoph Hellwig To: John Garry Cc: Christoph Hellwig , Theodore Ts'o , lsf-pc@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-mm , Luis Chamberlain , "Martin K. Petersen" , Matthew Wilcox , Dave Chinner , linux-kernel@vger.kernel.org Subject: Re: [LSF/MM/BPF TOPIC] untorn buffered writes Message-ID: References: <20240228061257.GA106651@mit.edu> <9e230104-4fb8-44f1-ae5a-a940f69b8d45@oracle.com> <4c68c88d-496c-4294-95a8-d2384d380fd3@oracle.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4c68c88d-496c-4294-95a8-d2384d380fd3@oracle.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Tue, May 28, 2024 at 10:21:15AM +0100, John Garry wrote: > If so, I am not sure if a mmap interface would work for DB usecase, like > PostgreSQL. I can ask. Databases really should be using direct I/O for various reasons. And if Postgres still isn't doing that we shouldn't work around that in the kernel.