From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754621AbYCXFXb (ORCPT ); Mon, 24 Mar 2008 01:23:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752018AbYCXFXW (ORCPT ); Mon, 24 Mar 2008 01:23:22 -0400 Received: from one.firstfloor.org ([213.235.205.2]:58359 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752083AbYCXFXV (ORCPT ); Mon, 24 Mar 2008 01:23:21 -0400 Date: Mon, 24 Mar 2008 06:26:23 +0100 From: Andi Kleen To: Nicholas Miell Cc: Ulrich Drepper , Andi Kleen , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables Message-ID: <20080324052623.GA13691@one.firstfloor.org> References: <20080320090005.GA25734@one.firstfloor.org> <20080321172644.GG2346@one.firstfloor.org> <20080322071755.GP2346@one.firstfloor.org> <1206170695.2438.39.camel@entropy> <20080322091001.GA7264@one.firstfloor.org> <1206335761.2438.63.camel@entropy> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1206335761.2438.63.camel@entropy> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org First emacs is still a rather small executable, there are much larger ones around. > The limit is filesystem dependent -- I think ext2/3s is something like > 4k total for attribute names and values per inode. That large xattrs tend to be out of line on a separate block and that would cost an additional seek. It would be unlikely to be continuous to the rest of the file data and thus even be worse than the SHDR which is at least likely to be served from the same track buffer as the executable. -Andi