Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751735AbVLGSkR (ORCPT ); Wed, 7 Dec 2005 13:40:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751738AbVLGSkQ (ORCPT ); Wed, 7 Dec 2005 13:40:16 -0500 Received: from fmr24.intel.com ([143.183.121.16]:45994 "EHLO scsfmr004.sc.intel.com") by vger.kernel.org with ESMTP id S1751735AbVLGSkN convert rfc822-to-8bit (ORCPT ); Wed, 7 Dec 2005 13:40:13 -0500 X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Subject: RE: [RFC 1/3] Framework for accurate node based statistics Date: Wed, 7 Dec 2005 10:39:54 -0800 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [RFC 1/3] Framework for accurate node based statistics Thread-Index: AcX7XAzPzDP2aXYaQV2LSJkCImLZ5QAAJecg From: "Luck, Tony" To: "Christoph Lameter" , "Keith Owens" Cc: "Andi Kleen" , , "Hugh Dickins" , "Nick Piggin" , , , "Marcelo Tosatti" X-OriginalArrivalTime: 07 Dec 2005 18:39:49.0026 (UTC) FILETIME=[9A5D4020:01C5FB5D] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 742 Lines: 22 >> 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 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/