From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 43AEFC433EF for ; Wed, 8 Jun 2022 06:59:48 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BC91C6B0071; Wed, 8 Jun 2022 02:59:47 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B790B6B0072; Wed, 8 Jun 2022 02:59:47 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A71836B0073; Wed, 8 Jun 2022 02:59:47 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 966296B0071 for ; Wed, 8 Jun 2022 02:59:47 -0400 (EDT) Received: from smtpin24.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay12.hostedemail.com (Postfix) with ESMTP id 6CFC3120D39 for ; Wed, 8 Jun 2022 06:59:47 +0000 (UTC) X-FDA: 79554168414.24.4DFC2D0 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by imf24.hostedemail.com (Postfix) with ESMTP id 4C917180036 for ; Wed, 8 Jun 2022 06:59:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1654671586; x=1686207586; h=message-id:subject:from:to:cc:date:in-reply-to: references:mime-version:content-transfer-encoding; bh=V5IH10Oa/APIbHxnd3+1jfus6BwIkyJBYQzSYhAxYXs=; b=QDOMRi9KhRquPdY3cS3NTy4ROysdV6REUoLBD7yVTQGBJ9xcW9Cg7Dex DuC43ItegnIltN1MeKs3DHbIOEgTTVRQgJoOSb/7mrloyF1QumhOeh0+1 QsEc0PHjLD/QhDvPEUCaZybh7vW/D3SqvWPV+7xuUOiVwmleFiy4mVj3j MzZP0al5iDMBFgZrj2Ej6RQkCFifHJhK54UohfZHjDr80DxtFSuCtAdHt +ZSeue71D+kc4/TjrPY6r9bk2aF8LiGTvGcOtG3QW5GP3Pju3BK5264yR 6PS/7SMaO2a3W4bEAHjPOBy5rLfnwRRgVFT39glW2G9lgjNITsQJmXLcE Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10371"; a="277958705" X-IronPort-AV: E=Sophos;i="5.91,285,1647327600"; d="scan'208";a="277958705" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jun 2022 23:59:34 -0700 X-IronPort-AV: E=Sophos;i="5.91,285,1647327600"; d="scan'208";a="584688344" Received: from xding11-mobl.ccr.corp.intel.com ([10.254.214.239]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jun 2022 23:59:29 -0700 Message-ID: Subject: Re: [PATCH v5 6/9] mm/demotion: Add support for removing node from demotion memory tiers From: Ying Huang To: "Aneesh Kumar K.V" , linux-mm@kvack.org, akpm@linux-foundation.org Cc: Wei Xu , Greg Thelen , Yang Shi , Davidlohr Bueso , Tim C Chen , Brice Goglin , Michal Hocko , Linux Kernel Mailing List , Hesham Almatary , Dave Hansen , Jonathan Cameron , Alistair Popple , Dan Williams , Feng Tang , Jagdish Gediya , Baolin Wang , David Rientjes Date: Wed, 08 Jun 2022 14:59:26 +0800 In-Reply-To: <20220603134237.131362-7-aneesh.kumar@linux.ibm.com> References: <20220603134237.131362-1-aneesh.kumar@linux.ibm.com> <20220603134237.131362-7-aneesh.kumar@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.38.3-1 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Stat-Signature: 45d8yhcia7fxmwjqyjpn8ooqcsnthqhr X-Rspam-User: Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=QDOMRi9K; dmarc=pass (policy=none) header.from=intel.com; spf=none (imf24.hostedemail.com: domain of ying.huang@intel.com has no SPF policy when checking 134.134.136.65) smtp.mailfrom=ying.huang@intel.com X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 4C917180036 X-HE-Tag: 1654671586-194846 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, 2022-06-03 at 19:12 +0530, Aneesh Kumar K.V wrote: > This patch adds the special string "none" as a supported memtier value > that we can use to remove a specific node from being using as demotion target. > > For ex: > :/sys/devices/system/node/node1# cat memtier > 1 > :/sys/devices/system/node/node1# cat ../../memtier/memtier1/nodelist > 1-3 > :/sys/devices/system/node/node1# echo none > memtier > :/sys/devices/system/node/node1# > :/sys/devices/system/node/node1# cat memtier > :/sys/devices/system/node/node1# cat ../../memtier/memtier1/nodelist > 2-3 > :/sys/devices/system/node/node1# Do you have a practical use case for this? What kind of memory node needs to be removed from memory tiers demotion/promotion? Best Regards, Huang, YIng [snip]