From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ie0-f169.google.com (mail-ie0-f169.google.com [209.85.223.169]) by kanga.kvack.org (Postfix) with ESMTP id DBF6B6B0038 for ; Tue, 25 Nov 2014 02:04:41 -0500 (EST) Received: by mail-ie0-f169.google.com with SMTP id y20so789ier.0 for ; Mon, 24 Nov 2014 23:04:41 -0800 (PST) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTPS id v12si263971ioi.18.2014.11.24.23.04.40 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 Nov 2014 23:04:40 -0800 (PST) Date: Mon, 24 Nov 2014 23:05:02 -0800 From: Andrew Morton Subject: Re: [PATCH] mm: add parameter to disable faultaround Message-Id: <20141124230502.30f9b6f0.akpm@linux-foundation.org> In-Reply-To: <1416898318-17409-1-git-send-email-chanho.min@lge.com> References: <1416898318-17409-1-git-send-email-chanho.min@lge.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Chanho Min Cc: "Kirill A. Shutemov" , Hugh Dickins , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, HyoJun Im , Gunho Lee , Wonhong Kwon On Tue, 25 Nov 2014 15:51:58 +0900 Chanho Min wrote: > The faultaround improves the file read performance, whereas pages which > can be dropped by drop_caches are reduced. On some systems, The amount of > freeable pages under memory pressure is more important than read > performance. The faultaround pages *are* freeable. Perhaps you meant "free" here. Please tell us a great deal about the problem which you are trying to solve. What sort of system, what sort of workload, what is bad about the behaviour which you are observing, etc. -- 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