From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 24 Sep 2007 16:35:49 -0500 From: Matt Mackall Subject: Re: + maps2-export-page-index-in-kpagemap.patch added to -mm tree Message-ID: <20070924213549.GJ19691@waste.org> References: <200709242044.l8OKi01e016834@imap1.linux-foundation.org> <20070924205901.GI19691@waste.org> <1190668988.26982.254.camel@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1190668988.26982.254.camel@localhost> Sender: owner-linux-mm@kvack.org Return-Path: To: Dave Hansen Cc: akpm@linux-foundation.org, wfg@mail.ustc.edu.cn, balbir@linux.vnet.ibm.com, jjberthels@gmail.com, linux-mm List-ID: On Mon, Sep 24, 2007 at 02:23:08PM -0700, Dave Hansen wrote: > On Mon, 2007-09-24 at 15:59 -0500, Matt Mackall wrote: > > > > If we really must do this, it'd be better to have a parallel file with > > the offsets. > > Yeah, I'd much rather have a couple of files with really, really simple > and _stable_ formats than one with a more complex and variable one. > > Although you can't answer the "which parts are mapped" question without > the page_index() information, you can answer the "what percentage of > this file is actively mapped" question. > > Could someone elaborate a little bit more on exactly why you'd want to > know which parts of the file are mapped? Google codesearch finds one actual user of remap_file_pages (and -lots- of false positives) in an obscure webserver, so I think the answer somehow involves Oracle. -- Mathematics is the supreme nostalgia of our time. -- 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