From mboxrd@z Thu Jan 1 00:00:00 1970 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 3EC1AC2FF; Thu, 9 Apr 2026 06:06:52 +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=1775714813; cv=none; b=LQwFZjUu6E1copG+m4Jpd3aGHY1ViBEjfLcpzI5zj5tq9rXyWPXOwK0KiR2kN9J0H4KeIr0dM/FqIU8/TO6V6Y0jpgBY3wecFJa5akszhJLTSgaRpz4wz0ia77/y9SMA2brWcDIt6EjaKsI0jvF52JU52pXgOdl+VnVyn0NpFvg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775714813; c=relaxed/simple; bh=FKtcCNipVXmD2IiBtOU+LSDhnsDYL6gID3nBa9k02vA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=J1a+fTdMPIFQkU3Eh7FPxL7QHOXycSGf4KDuvIibMvGORCiDLNSH5YRl6IVXFR2IauvWdfGl7JdyhFE9yh3TUXeVuYq0NEa3yZHzJ1gqXmogo+VIcMLfZaoEyJhL9/FmXkAK90HLkj2YImY8kh+YRvx6+yA86+qY28IJtdusPgk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=NoWQsXZR; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="NoWQsXZR" 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=MoIk3QXCJ15PUs08yPqRQRJkWDOpoLHAsaU9dEoaDdI=; b=NoWQsXZRjYZWDfbKjd8x8lDS7q hqv81mkMVT5Nerz8ZCUOl54FlxVECej5vgAk2MjPAdNjTMin66BXINo6pKCjnKka00/CklqOr1mYb lKcHzntcxC6JQ25i8Dm/OLF1UgvSIw+0W2xdgeFg50wC42U8LAk2f6do6HXEFDJcASStIXjfH85Ql 3jcHuApM1LHFVYzLrcNDBbwMi5mogSDHre1ajepfUEBlPIoJ6iyfwNvHg8J+PLxSI+lM2UExI0XTS eWAHEQe+vfgThTrcQCKYrrtWXGgbWh+uyvEQ+r3HKv5FZrqQQY8Il/oA099ANIZ2LhChbsp4HuuRW bDWKjZfg==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1wAiXR-00000009k4Z-2Duk; Thu, 09 Apr 2026 06:06:49 +0000 Date: Wed, 8 Apr 2026 23:06:49 -0700 From: Christoph Hellwig To: Jeff Layton Cc: Alexander Viro , Christian Brauner , Jan Kara , "Matthew Wilcox (Oracle)" , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Mike Snitzer , Jens Axboe , Chuck Lever , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 0/3] mm: improve write performance with RWF_DONTCACHE Message-ID: References: <20260408-dontcache-v2-0-948dec1e756b@kernel.org> Precedence: bulk X-Mailing-List: linux-fsdevel@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: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Wed, Apr 08, 2026 at 02:45:32PM -0400, Jeff Layton wrote: > > Assuming that looks OK, I'll probably send a v3. Original cover letter > > from v1 follows: > > > > Actually, that version regressed performance in a couple of cases. > I think v2 is probably the best approach, on balance. Limiting writeback to a specific inode has many downsides as I explained before, so this is not surprising. > Maybe we can get this into -next so that it can make v7.2? If you want to target 7.2 we're not in any rush. If you were trying to say 7.1 we're way to close too the merge window. We also haven't heard from Jens at all, whom I'd really like to look over this.