From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752047Ab3CARsz (ORCPT ); Fri, 1 Mar 2013 12:48:55 -0500 Received: from lxorguk.ukuu.org.uk ([81.2.110.251]:60460 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751367Ab3CARsx (ORCPT ); Fri, 1 Mar 2013 12:48:53 -0500 Date: Fri, 1 Mar 2013 17:48:52 +0000 From: Alan Cox To: Andrew Shewmaker Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH v2 1/2] mm: tuning hardcoded reserved memory Message-ID: <20130301174852.5d568191@www.etchedpixels.co.uk> In-Reply-To: <20130228034803.GB3829@localhost.localdomain> References: <20130227205629.GA8429@localhost.localdomain> <20130228141200.3fe7f459.akpm@linux-foundation.org> <20130228034803.GB3829@localhost.localdomain> X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.13; x86_64-pc-linux-gnu) Face: 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 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The 3% reserve was added to the original code *because* users kept hitting problems where they couldn't recover. I suspect the tunable should nowdays be something related to min(3%, someconstant), at the time we did the 3% I think 1GB was an "enterprise system" ;) Alan