From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [RFC][PATCH 2/9] deadlock prevention core From: Peter Zijlstra In-Reply-To: <20060813215853.0ed0e973.akpm@osdl.org> References: <20060808211731.GR14627@postel.suug.ch> <44DBED4C.6040604@redhat.com> <44DFA225.1020508@google.com> <20060813.165540.56347790.davem@davemloft.net> <44DFD262.5060106@google.com> <20060813185309.928472f9.akpm@osdl.org> <1155530453.5696.98.camel@twins> <20060813215853.0ed0e973.akpm@osdl.org> Content-Type: text/plain Date: Mon, 14 Aug 2006 07:03:55 +0200 Message-Id: <1155531835.5696.103.camel@twins> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Daniel Phillips , David Miller , riel@redhat.com, tgraf@suug.ch, linux-mm@kvack.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Mike Christie List-ID: On Sun, 2006-08-13 at 21:58 -0700, Andrew Morton wrote: > On Mon, 14 Aug 2006 06:40:53 +0200 > Peter Zijlstra wrote: > > > Testcase: > > > > Mount an NBD device as sole swap device and mmap > physical RAM, then > > loop through touching pages only once. > > Fix: don't try to swap over the network. Yes, there may be some scenarios > where people have no local storage, but it's reasonable to expect anyone > who is using Linux as an "enterprise storage platform" to stick a local > disk on the thing for swap. I wish you were right, however there seems to be a large demand to go diskless and swap over iSCSI because disks seem to be the nr. 1 failing piece of hardware in systems these days. > That leaves MAP_SHARED, but mm-tracking-shared-dirty-pages.patch will fix > that, will it not? Will makes it less likely. One can still have memory pressure, the remaining bits of memory can still get stuck in socket queues for blocked processes. -- 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