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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 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-Rspamd-Queue-Id: 9819E120017 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: t5pzi3rmour4bf1s8yw8sqfk16zhp9zp X-HE-Tag: 1698940390-591977 X-HE-Meta: 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 X4q32jy3 NhlkvS+8qS6HNrEWVNEkskQ28SipxvFBgxJbZx4e3KYvFO4MAngXFbK4OMhWPkkxV2DibpKqqoW4LXnUfH0UnGX0C4xKjrQ1QevN4W6lvCdOs/q2/1PVIBHzqDZUhQULadCqRE6aCJdl3oq7ZN/kC9BywCqaEgWy7VBPBpHw3yKkKQewioCggBZFjHJrdA/xUr9oK2VFF0cXQ1st0bLOa3yRjOuWmYyXHDZ4OIBgniZDZXNlYjMtG8MoAGqpKEE48+EpYO7xsDmqFq5dAKhTvrYLODV0QQ3l+4wZlJ3GeijdHURlcgfFIdJfCTd14krlqt6Zb8gpLvMEN5irL+B8LOcV56vumlSwsiS5AFRzDFeZZ4wkbTVH7wIUxorlkuRuSUjiqgDcxol676btwdJgSbeKhytrm07FskL8hLXhOiUCC+XekEOjXLL6vS5+m5MkdHC2woqGrHIBRx4hZvj+PNhxygCa12mxFbN9cjz7n6YTzzP4= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000027, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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