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[2003:cb:c716:3000:f155:cef2:ff4d:c7]) by smtp.gmail.com with ESMTPSA id j13-20020a05600c190d00b004067e905f44sm3376475wmq.9.2023.11.02.08.53.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 02 Nov 2023 08:53:05 -0700 (PDT) Message-ID: <025ef794-91a9-4f0c-9eb6-b0a4856fa10a@redhat.com> Date: Thu, 2 Nov 2023 16:53:04 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/1] mm: report per-page metadata information Content-Language: en-US To: Pasha Tatashin Cc: Wei Xu , Sourav Panda , corbet@lwn.net, gregkh@linuxfoundation.org, rafael@kernel.org, akpm@linux-foundation.org, mike.kravetz@oracle.com, muchun.song@linux.dev, rppt@kernel.org, rdunlap@infradead.org, chenlinxuan@uniontech.com, yang.yang29@zte.com.cn, tomas.mudrunka@gmail.com, bhelgaas@google.com, ivan@cloudflare.com, yosryahmed@google.com, hannes@cmpxchg.org, shakeelb@google.com, kirill.shutemov@linux.intel.com, wangkefeng.wang@huawei.com, adobriyan@gmail.com, vbabka@suse.cz, Liam.Howlett@oracle.com, surenb@google.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, willy@infradead.org, Greg Thelen References: <20231101230816.1459373-1-souravpanda@google.com> <20231101230816.1459373-2-souravpanda@google.com> <1e99ff39-b1cf-48b8-8b6d-ba5391e00db5@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-1.3 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Thu, 02 Nov 2023 08:54:20 -0700 (PDT) On 02.11.23 16:50, Pasha Tatashin wrote: >>> Adding reserved memory to MemTotal is a cleaner approach IMO as well. >>> But it changes the semantics of MemTotal, which may have compatibility >>> issues. >> >> I object. > > Could you please elaborate what you object (and why): you object that > it will have compatibility issues, or you object to include memblock > reserves into MemTotal? Sorry, I object to changing the semantics of MemTotal. MemTotal is traditionally the memory managed by the buddy, not all memory in the system. I know people/scripts that are relying on that [although it's been source of confusion a couple of times]. -- Cheers, David / dhildenb