From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754641Ab2LOW30 (ORCPT ); Sat, 15 Dec 2012 17:29:26 -0500 Received: from lxorguk.ukuu.org.uk ([81.2.110.251]:38234 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751404Ab2LOW3Z (ORCPT ); Sat, 15 Dec 2012 17:29:25 -0500 Date: Sat, 15 Dec 2012 22:34:48 +0000 From: Alan Cox To: Eric Wong Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] fadvise: perform WILLNEED readahead in a workqueue Message-ID: <20121215223448.08272fd5@pyramind.ukuu.org.uk> In-Reply-To: <20121215005448.GA7698@dcvr.yhbt.net> References: <20121215005448.GA7698@dcvr.yhbt.net> X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.8; x86_64-redhat-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 On Sat, 15 Dec 2012 00:54:48 +0000 Eric Wong wrote: > Applications streaming large files may want to reduce disk spinups and > I/O latency by performing large amounts of readahead up front How does it compare benchmark wise with a user thread or using the readahead() call ?