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[2003:cb:c701:d200:ee5d:1275:f171:136d]) by smtp.gmail.com with ESMTPSA id s19-20020a1cf213000000b003942a244edfsm1850197wmc.36.2022.05.12.00.36.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 May 2022 00:36:16 -0700 (PDT) Message-ID: Date: Thu, 12 May 2022 09:36:15 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 Subject: Re: [PATCH v10 2/4] mm: memory_hotplug: override memmap_on_memory when hugetlb_free_vmemmap=on To: Muchun Song , corbet@lwn.net, mike.kravetz@oracle.com, akpm@linux-foundation.org, mcgrof@kernel.org, keescook@chromium.org, yzaikin@google.com, osalvador@suse.de, masahiroy@kernel.org Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, duanxiongchun@bytedance.com, smuchun@gmail.com References: <20220509062703.64249-1-songmuchun@bytedance.com> <20220509062703.64249-3-songmuchun@bytedance.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20220509062703.64249-3-songmuchun@bytedance.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: BD0DA400A4 X-Stat-Signature: qhjm3fk4wusjnyikqowxfk796s754wd9 X-Rspam-User: Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=CRpd8lDH; spf=none (imf11.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 170.10.129.124) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-HE-Tag: 1652340976-506692 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 09.05.22 08:27, Muchun Song wrote: > Optimizing HugeTLB vmemmap pages is not compatible with allocating memmap on > hot added memory. If "hugetlb_free_vmemmap=on" and > memory_hotplug.memmap_on_memory" are both passed on the kernel command line, > optimizing hugetlb pages takes precedence. Why? -- Thanks, David / dhildenb