From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f47.google.com (mail-pa0-f47.google.com [209.85.220.47]) by kanga.kvack.org (Postfix) with ESMTP id 6A3696B0031 for ; Fri, 3 Jan 2014 17:08:56 -0500 (EST) Received: by mail-pa0-f47.google.com with SMTP id kq14so16138407pab.6 for ; Fri, 03 Jan 2014 14:08:56 -0800 (PST) Received: from smtp.codeaurora.org (smtp.codeaurora.org. [198.145.11.231]) by mx.google.com with ESMTPS id ot3si47055224pac.21.2014.01.03.14.08.54 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 03 Jan 2014 14:08:55 -0800 (PST) Message-ID: <52C734F4.5020602@codeaurora.org> Date: Fri, 03 Jan 2014 14:08:52 -0800 From: Laura Abbott MIME-Version: 1.0 Subject: Re: [RFC PATCHv3 00/11] Intermix Lowmem and vmalloc References: <1388699609-18214-1-git-send-email-lauraa@codeaurora.org> <52C70024.1060605@sr71.net> In-Reply-To: <52C70024.1060605@sr71.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Dave Hansen , Andrew Morton , Kyungmin Park , linux-mm@kvack.org, Russell King Cc: linux-kernel@vger.kernel.org On 1/3/2014 10:23 AM, Dave Hansen wrote: > On 01/02/2014 01:53 PM, Laura Abbott wrote: >> The goal here is to allow as much lowmem to be mapped as if the block of memory >> was not reserved from the physical lowmem region. Previously, we had been >> hacking up the direct virt <-> phys translation to ignore a large region of >> memory. This did not scale for multiple holes of memory however. > > How much lowmem do these holes end up eating up in practice, ballpark? > I'm curious how painful this is going to get. > In total, the worst case can be close to 100M with an average case around 70M-80M. The split and number of holes vary with the layout but end up with 60M-80M one hole and the rest in the other. Thanks, Laura -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org