Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967257AbXIKUTS (ORCPT ); Tue, 11 Sep 2007 16:19:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965826AbXIKULZ (ORCPT ); Tue, 11 Sep 2007 16:11:25 -0400 Received: from netops-testserver-4-out.sgi.com ([192.48.171.29]:57458 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S965806AbXIKULX (ORCPT ); Tue, 11 Sep 2007 16:11:23 -0400 Date: Tue, 11 Sep 2007 13:11:21 -0700 (PDT) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: Nick Piggin cc: Mel Gorman , andrea@suse.de, torvalds@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig , Mel Gorman , William Lee Irwin III , David Chinner , Jens Axboe , Badari Pulavarty , Maxim Levitsky , Fengguang Wu , swin wang , totty.lu@gmail.com, hugh@veritas.com, joern@lazybastard.org Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support) In-Reply-To: <200709111144.48743.nickpiggin@yahoo.com.au> Message-ID: References: <20070911060349.993975297@sgi.com> <200709110452.20363.nickpiggin@yahoo.com.au> <1189524967.32731.58.camel@localhost> <200709111144.48743.nickpiggin@yahoo.com.au> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1026 Lines: 19 On Tue, 11 Sep 2007, Nick Piggin wrote: > It would be interesting to craft an attack. If you knew roughly the layout > and size of your dentry slab for example... maybe you could stat a whole > lot of files, then open one and keep it open (maybe post the fd to a unix > socket or something crazy!) when you think you have filled up a couple > of MB worth of them. Repeat the process until your movable zone is > gone. Or do the same things with pagetables, or task structs, or radix > tree nodes, etc.. these are the kinds of things I worry about (as well as > just the gradual natural degredation). I guess you would have to run that without my targeted slab reclaim patchset? Otherwise the slab that are in the way could be reclaimed and you could not produce your test case. - 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/