Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964900AbWL1DuF (ORCPT ); Wed, 27 Dec 2006 22:50:05 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964905AbWL1DuF (ORCPT ); Wed, 27 Dec 2006 22:50:05 -0500 Received: from smtp.osdl.org ([65.172.181.25]:55517 "EHLO smtp.osdl.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964900AbWL1DuD (ORCPT ); Wed, 27 Dec 2006 22:50:03 -0500 Date: Wed, 27 Dec 2006 19:49:59 -0800 From: Andrew Morton To: "Zhang, Yanmin" Cc: LKML Subject: Re: [PATCH] drop page cache of a single file Message-Id: <20061227194959.0ebce0e4.akpm@osdl.org> In-Reply-To: <1167275845.15989.153.camel@ymzhang> References: <1167275845.15989.153.camel@ymzhang> X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.17; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 747 Lines: 16 On Thu, 28 Dec 2006 11:17:25 +0800 "Zhang, Yanmin" wrote: > Currently, by /proc/sys/vm/drop_caches, applications could drop pagecache, > slab(dentries and inodes), or both, but applications couldn't choose to > just drop the page cache of one file. An user of VOD (Video-On-Demand) > needs this capability to have more detailed control on page cache release. The posix_fadvise() system call should be used for this. Probably in combination with sys_sync_file_range(). - 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/