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 AF8EBC433EF for ; Fri, 25 Feb 2022 00:49:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 276208D0002; Thu, 24 Feb 2022 19:49:51 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 224F08D0001; Thu, 24 Feb 2022 19:49:51 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 115218D0002; Thu, 24 Feb 2022 19:49:51 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0089.hostedemail.com [216.40.44.89]) by kanga.kvack.org (Postfix) with ESMTP id EF2A98D0001 for ; Thu, 24 Feb 2022 19:49:50 -0500 (EST) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id AAA9B96F3A for ; Fri, 25 Feb 2022 00:49:50 +0000 (UTC) X-FDA: 79179469740.27.73C5673 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by imf18.hostedemail.com (Postfix) with ESMTP id 6EE041C0009 for ; Fri, 25 Feb 2022 00:49:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645750189; x=1677286189; h=message-id:date:mime-version:to:cc:references:from: subject:in-reply-to:content-transfer-encoding; bh=EgGx5qIAw7Tb4rEPAO2/54qSHMC2QYlZA6qYHpBBk3k=; b=Mkc0msc2tF3SIRvBjF4+W9WAf41PVPeyrvnaXlSVg9wG9gVAxjPPXXvp g+Gi80A9Zplv/TFSzdwis4K2WIWIyAeMzZetE1KEuyb/JgZNqFeV/4Bf5 firnujhVQzla2FM+2ze8gqxLFDGNZwcSiIQmz1NytD1Oq0Q0RiDLiG6dd /Irz1JzMSoRZw5fw7SwH4okAv3IHnTi82WkQMr4PV16aDe1f5uOcO6gKo mIIOU6ljvgKeNB9f9PuZRtW2spKpZoSadIT/pODlmo5VS/qSjS3GJSjMy RutdlYYlZyCeRVDPN6UGjzlG81TzgiWoIbPYJlUKkXh2G6GEL4VWmoZaL Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10268"; a="233011219" X-IronPort-AV: E=Sophos;i="5.90,134,1643702400"; d="scan'208";a="233011219" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Feb 2022 16:49:48 -0800 X-IronPort-AV: E=Sophos;i="5.90,134,1643702400"; d="scan'208";a="639938510" Received: from hthen-mobl2.amr.corp.intel.com (HELO [10.209.48.194]) ([10.209.48.194]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Feb 2022 16:49:47 -0800 Message-ID: <4d3c777e-20bd-b1f2-12ba-6af9d08cca45@intel.com> Date: Thu, 24 Feb 2022 16:49:43 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Content-Language: en-US To: Abhishek Goel , Dave Hansen Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Zi Yan , David Hildenbrand , Yang Shi , Huang Ying , Andrew Morton References: <20210721063926.3024591-1-ying.huang@intel.com> <20210721063926.3024591-2-ying.huang@intel.com> <4e8067e1-0574-c9d2-9d6c-d676d32071bd@linux.vnet.ibm.com> From: Dave Hansen Subject: Re: [PATCH -V11 2/9] mm/migrate: update node demotion order on hotplug events In-Reply-To: <4e8067e1-0574-c9d2-9d6c-d676d32071bd@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 6EE041C0009 X-Stat-Signature: rf4h78qfz51w36xr7d5qeeyfxxh59p93 Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=Mkc0msc2; spf=none (imf18.hostedemail.com: domain of dave.hansen@intel.com has no SPF policy when checking 192.55.52.151) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (policy=none) header.from=intel.com X-Rspam-User: X-HE-Tag: 1645750189-345919 Content-Transfer-Encoding: quoted-printable 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 2/24/22 15:37, Abhishek Goel wrote: >=20 > On 24/02/22 05:35, Dave Hansen wrote: >> On 2/23/22 15:02, Abhishek Goel wrote: >>> If needed, I will provide experiment results and traces that were use= d >>> to conclude this. >> It would be great if you can provide some more info.=C2=A0 Even just a= CPU >> time profile would be helpful. >=20 > Average total time taken for SMT=3D8 to SMT=3D1 in v5.14 : 20s >=20 > Average total time taken for SMT=3D8 to SMT=3D1 in v5.15 : 36s >=20 > (Observed in system with 150+ CPUs ) I was kinda thinking of: perf record / perf report output. Not wall clock time. We need to know what the kernel is doing during those extra 16 seconds.