From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 4 Oct 2007 14:20:19 -0700 (PDT) From: Christoph Lameter Subject: Re: [13/18] x86_64: Allow fallback for the stack In-Reply-To: <20071004153940.49bd5afc@bree.surriel.com> Message-ID: References: <20071004035935.042951211@sgi.com> <20071004040004.708466159@sgi.com> <200710041356.51750.ak@suse.de> <20071004153940.49bd5afc@bree.surriel.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Rik van Riel Cc: Andi Kleen , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, travis@sgi.com List-ID: On Thu, 4 Oct 2007, Rik van Riel wrote: > > Well we can now address the rarity. That is the whole point of the > > patchset. > > Introducing complexity to fight a very rare problem with a good > fallback (refusing to fork more tasks, as well as lumpy reclaim) > somehow does not seem like a good tradeoff. The problem can become non-rare on special low memory machines doing wild swapping things though. > > It will be more common if the stack size is increased beyond 8k. > > Why would we want to do such a thing? Because NUMA requires more stack space. In particular support for very large cpu configurations of 16k may require 2k cpumasks on the stack. > 8kB stacks are large enough... For many things yes. I just want to have the compile time option to increase it. -- 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