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[2003:d8:2f4a:8900:884a:b3af:e3c9:ec88]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-442fa3e2ce5sm24293475e9.13.2025.05.15.09.11.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 May 2025 09:11:57 -0700 (PDT) Message-ID: <3a2a329d-2592-4e31-a763-d87dcd925966@redhat.com> Date: Thu, 15 May 2025 18:11:55 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/6] prctl: introduce PR_THP_POLICY_DEFAULT_HUGE for the process To: Lorenzo Stoakes , Usama Arif Cc: Andrew Morton , linux-mm@kvack.org, hannes@cmpxchg.org, shakeel.butt@linux.dev, riel@surriel.com, ziy@nvidia.com, laoar.shao@gmail.com, baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kernel-team@meta.com References: <20250515133519.2779639-1-usamaarif642@gmail.com> <20250515133519.2779639-2-usamaarif642@gmail.com> <02ead03b-339b-45c8-b252-d31a66501c39@lucifer.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: fbye77ueh4155m6skfideuax1hnyfjho X-Rspam-User: X-Rspamd-Queue-Id: 4CDD21C0002 X-Rspamd-Server: rspam06 X-HE-Tag: 1747325521-694269 X-HE-Meta: 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 fWXaeiBC 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 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: List-Subscribe: List-Unsubscribe: >>> So if you're not overriding VM_NOHUGEPAGE, the whole point of this exercise >>> is to override global 'never'? >>> >> >> Again, I am not overriding never. >> >> hugepage_global_always and hugepage_global_enabled will evaluate to false >> and you will not get a hugepage. > > Yeah, again ack, but I kind of hate that we set VM_HUGEPAGE everywhere even > if the policy is never. I think it should behave just as if someone does manually an madvise(). So whatever we do here during an madvise, we should try to do the same thing here. -- Cheers, David / dhildenb