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 D0A2CC433EF for ; Tue, 23 Nov 2021 13:20:33 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 52BAB6B0072; Tue, 23 Nov 2021 08:20:18 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 4B3FB6B0073; Tue, 23 Nov 2021 08:20:18 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 354D86B0074; Tue, 23 Nov 2021 08:20:18 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0078.hostedemail.com [216.40.44.78]) by kanga.kvack.org (Postfix) with ESMTP id 2630D6B0072 for ; Tue, 23 Nov 2021 08:20:18 -0500 (EST) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id D9D4E824C43C for ; Tue, 23 Nov 2021 13:20:07 +0000 (UTC) X-FDA: 78840253338.01.560B4C2 Received: from out30-42.freemail.mail.aliyun.com (out30-42.freemail.mail.aliyun.com [115.124.30.42]) by imf15.hostedemail.com (Postfix) with ESMTP id 76FDAD00009D for ; Tue, 23 Nov 2021 13:20:01 +0000 (UTC) X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R261e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04400;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=10;SR=0;TI=SMTPD_---0UxzBImG_1637673599; Received: from 30.32.124.111(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0UxzBImG_1637673599) by smtp.aliyun-inc.com(127.0.0.1); Tue, 23 Nov 2021 21:20:00 +0800 Message-ID: <399f9ef5-3a77-902a-7b4c-86020e629944@linux.alibaba.com> Date: Tue, 23 Nov 2021 21:20:47 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Subject: Re: [RFC PATCH] mm: Promote slow memory in advance to improve performance To: Yang Shi , Mel Gorman Cc: Andrew Morton , Huang Ying , Dave Hansen , Zi Yan , zhongjiang-ali@linux.alibaba.com, Xunlei Pang , Linux MM , Linux Kernel Mailing List References: From: Baolin Wang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 76FDAD00009D X-Stat-Signature: tuuq8equ8sicz3sj965n6wnc8hkc187x Authentication-Results: imf15.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=alibaba.com; spf=pass (imf15.hostedemail.com: domain of baolin.wang@linux.alibaba.com designates 115.124.30.42 as permitted sender) smtp.mailfrom=baolin.wang@linux.alibaba.com X-Rspamd-Server: rspam02 X-HE-Tag: 1637673601-470262 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 2021/11/23 3:34, Yang Shi wrote: > On Mon, Nov 22, 2021 at 2:22 AM Baolin Wang > wrote: >> >> Some workloads access a set of data entities will follow the data locality, >> also known as locality of reference, which means the probability of accessing >> some data soon after some nearby data has been accessed. >> >> On some systems with different memory types, which will rely on the numa >> balancing to promote slow hot memory to fast memory to improve performance. >> So we can promote several sequential pages on slow memory at one time >> according to the data locality for some workloads to improve the performance. > > Fault around for NUMA fault definitely could reduce the overhead for > NUMA balancing by having fewer faults. I think this could be extended > to regular NUMA balancing too. But I'm not sure whether false > positives are worth concerning or not. OK. Like Huang Ying said, maybe we can add some algorithm to adjust the window of proactive numa faults dynamically. Thanks for your input. > > I recall Mel proposed fault around too (not in patch, but shared some > ideas). Added Mel in this thread.