Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752319AbaKYHEm (ORCPT ); Tue, 25 Nov 2014 02:04:42 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:59800 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752287AbaKYHEk (ORCPT ); Tue, 25 Nov 2014 02:04:40 -0500 Date: Mon, 24 Nov 2014 23:05:02 -0800 From: Andrew Morton 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 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> X-Mailer: Sylpheed 2.7.1 (GTK+ 2.18.9; x86_64-redhat-linux-gnu) 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 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/