From mboxrd@z Thu Jan 1 00:00:00 1970 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8BIT Subject: RE: [RFC 1/3] Framework for accurate node based statistics Date: Wed, 7 Dec 2005 10:39:54 -0800 Message-ID: From: "Luck, Tony" Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter , Keith Owens Cc: Andi Kleen , linux-kernel@vger.kernel.org, Hugh Dickins , Nick Piggin , linux-mm@kvack.org, linux-ia64@vger.kernel.org, Marcelo Tosatti List-ID: >> How big is that array going to get? The total per cpu data area is >> limited to 64K on IA64 and we already use at least 34K. > > Maximum around 1k nodes and I guess we may end up with 16 counters: > > 1024*16*8 = 131k ? Ouch. Can you live with a pointer to that monster block of space in the per-cpu area? Otherwise the next step up is a 256K per cpu area ... which I wouldn't want to make the default (so we'll have another 2*X explosion in the number of possible configs to test). -Tony -- 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