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[2620:137:e000::1:20]) by mx.google.com with ESMTP id p6-20020a056a000b4600b004f7918a1e94si3930206pfo.362.2022.03.17.00.27.16; Thu, 17 Mar 2022 00:27:29 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=alibaba.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230114AbiCQHEi (ORCPT + 99 others); Thu, 17 Mar 2022 03:04:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229998AbiCQHEe (ORCPT ); Thu, 17 Mar 2022 03:04:34 -0400 Received: from out30-131.freemail.mail.aliyun.com (out30-131.freemail.mail.aliyun.com [115.124.30.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D35407520A for ; Thu, 17 Mar 2022 00:03:16 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R101e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=xhao@linux.alibaba.com;NM=1;PH=DS;RN=7;SR=0;TI=SMTPD_---0V7QLPIa_1647500592; Received: from B-X3VXMD6M-2058.local(mailfrom:xhao@linux.alibaba.com fp:SMTPD_---0V7QLPIa_1647500592) by smtp.aliyun-inc.com(127.0.0.1); Thu, 17 Mar 2022 15:03:13 +0800 From: Xin Hao Reply-To: xhao@linux.alibaba.com Subject: Re: [RFC PATCH V1 0/3] mm/damon: Add CMA minotor support To: David Hildenbrand , sj@kernel.org Cc: rongwei.wang@linux.alibaba.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Baolin Wang References: Message-ID: <6e6ef9fa-3916-3449-954d-efd63a959019@linux.alibaba.com> Date: Thu, 17 Mar 2022 15:03:11 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-9.9 required=5.0 tests=BAYES_00, ENV_AND_HDR_SPF_MATCH,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY,USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi David, On 3/16/22 11:09 PM, David Hildenbrand wrote: > On 15.03.22 17:37, Xin Hao wrote: > > s/minotor/monitor/ Thanks,  i will fix it. > >> The purpose of these patches is to add CMA memory monitoring function. >> In some memory tight scenarios, it will be a good choice to release more >> memory by monitoring the CMA memory. > I'm sorry, but it's hard to figure out what the target use case should > be. Who will release CMA memory and how? Who will monitor that? What are > the "some memory tight scenarios"? What's the overall design goal? I may not be describing exactly what  i mean，My intention is to find out how much of the reserved CMA space is actually used and which is unused, For those that are not used, I understand that they can be released by cma_release(). Of course, This is just a little personal thought that I think is helpful for saving memory. > -- Best Regards! Xin Hao