Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932508AbVLOAby (ORCPT ); Wed, 14 Dec 2005 19:31:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932633AbVLOAby (ORCPT ); Wed, 14 Dec 2005 19:31:54 -0500 Received: from omx1-ext.sgi.com ([192.48.179.11]:15797 "EHLO omx1.americas.sgi.com") by vger.kernel.org with ESMTP id S932508AbVLOAbx (ORCPT ); Wed, 14 Dec 2005 19:31:53 -0500 Date: Wed, 14 Dec 2005 16:31:51 -0800 (PST) From: Christoph Lameter To: linux-kernel@vger.kernel.org Cc: Christoph Lameter Message-Id: <20051215003151.31788.8755.sendpatchset@schroedinger.engr.sgi.com> Subject: [RFC3 00/14] Zoned VM stats Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1852 Lines: 45 Zone based VM statistics are necessary to be able to determine what the state of memory in one zone is. In a NUMA system this can be helpful to do local reclaim and other memory optimizations by shifting VM load to optimize page allocation. It is also helpful to know how the computing load affects the memory allocations on various zones. The patchset introduces a framework for counters that is a cross between the existing page_stats --which are simply global counters split per cpu-- and the approach of deferred incremental updates implemented for nr_pagecache. Small per cpu 8 bit counters are introduced in struct zone. If counting exceeds certain threshold then the counters are accumulated in an array in the zone of the page and in a global array. This means that access to VM counter information for a zone and for the whole machine is possible by simply indexing an array. [Thanks to Nick Piggin for pointing me at that approach]. The new statistics are then used to realize zone reclaim. Patchset is against 2.6.15-rc5-mm2. The patches after zone reclaim are optional. This is expanding and I hope its complete. But I have not tested it in UP and SMP yet. There may be yet unforeseen consequences to the changes to various counters. 1 Add some consts for inlines in mm.h 2 Basic counter functionality 3 Convert nr_mapped 4 Convert nr_pagecache 5 Resurrect scan_control.may_swap 6 Zone Reclaim 7 Expanded node and zone statistics 8 Convert nr_slab 9 Convert nr_page_table 10 Convert nr_dirty 11 Convert nr_writeback 12 Convert nr_unstable 13 Remove get_page_state functions 14 Remove wbs - 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/