From patchwork Wed Dec 26 13:14:53 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fengguang Wu X-Patchwork-Id: 10743151 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 751C9924 for ; Wed, 26 Dec 2018 13:39:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 639B628495 for ; Wed, 26 Dec 2018 13:39:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 564ED284D4; Wed, 26 Dec 2018 13:39:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0A31028495 for ; Wed, 26 Dec 2018 13:39:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727318AbeLZNjf (ORCPT ); Wed, 26 Dec 2018 08:39:35 -0500 Received: from mga04.intel.com ([192.55.52.120]:33941 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726899AbeLZNhF (ORCPT ); Wed, 26 Dec 2018 08:37:05 -0500 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Dec 2018 05:37:04 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,400,1539673200"; d="scan'208";a="121185457" Received: from wangdan1-mobl1.ccr.corp.intel.com (HELO wfg-t570.sh.intel.com) ([10.254.210.154]) by FMSMGA003.fm.intel.com with ESMTP; 26 Dec 2018 05:37:01 -0800 Received: from wfg by wfg-t570.sh.intel.com with local (Exim 4.89) (envelope-from ) id 1gc9Mr-0005ON-BS; Wed, 26 Dec 2018 21:37:01 +0800 Message-Id: <20181226133351.463947436@intel.com> User-Agent: quilt/0.65 Date: Wed, 26 Dec 2018 21:14:53 +0800 From: Fengguang Wu To: Andrew Morton cc: Linux Memory Management List , Fan Du , Fengguang Wu cc: kvm@vger.kernel.org Cc: LKML cc: Yao Yuan cc: Peng Dong cc: Huang Ying CC: Liu Jingqi cc: Dong Eddie cc: Dave Hansen cc: Zhang Yi cc: Dan Williams Subject: [RFC][PATCH v2 07/21] mm: export node type {pmem|dram} under /sys/bus/node References: <20181226131446.330864849@intel.com> MIME-Version: 1.0 Content-Disposition: inline; filename=0005-Export-node-type-pmem-ram-in-sys-bus-node.patch Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Fan Du User space migration daemon could check /sys/bus/node/devices/nodeX/type for node type. Software can interrogate node type for node memory type and distance to get desirable target node in migration. grep -r . /sys/devices/system/node/*/type /sys/devices/system/node/node0/type:dram /sys/devices/system/node/node1/type:dram /sys/devices/system/node/node2/type:pmem /sys/devices/system/node/node3/type:pmem Along with next patch which export `peer_node`, migration daemon could easily find the memory type of current node, and the target node in case of migration. grep -r . /sys/devices/system/node/*/peer_node /sys/devices/system/node/node0/peer_node:2 /sys/devices/system/node/node1/peer_node:3 /sys/devices/system/node/node2/peer_node:0 /sys/devices/system/node/node3/peer_node:1 Signed-off-by: Fan Du Signed-off-by: Fengguang Wu --- drivers/base/node.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- linux.orig/drivers/base/node.c 2018-12-23 19:39:04.763414931 +0800 +++ linux/drivers/base/node.c 2018-12-23 19:39:04.763414931 +0800 @@ -233,6 +233,15 @@ static ssize_t node_read_distance(struct } static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL); +static ssize_t type_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int nid = dev->id; + + return sprintf(buf, is_node_pmem(nid) ? "pmem\n" : "dram\n"); +} +static DEVICE_ATTR(type, S_IRUGO, type_show, NULL); + static struct attribute *node_dev_attrs[] = { &dev_attr_cpumap.attr, &dev_attr_cpulist.attr, @@ -240,6 +249,7 @@ static struct attribute *node_dev_attrs[ &dev_attr_numastat.attr, &dev_attr_distance.attr, &dev_attr_vmstat.attr, + &dev_attr_type.attr, NULL }; ATTRIBUTE_GROUPS(node_dev);