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([2a01:4b00:b211:ad00:1096:2c00:b223:9747]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a355e03404sm1734114f8f.40.2025.05.15.07.56.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 May 2025 07:56:18 -0700 (PDT) Message-ID: <47603579-4d42-4617-8386-6656341c8d56@gmail.com> Date: Thu, 15 May 2025 15:56:18 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/6] prctl: introduce PR_THP_POLICY_DEFAULT_HUGE for the process To: David Hildenbrand , Lorenzo Stoakes 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> <2d30bcce-6f80-468f-945d-b63eff726db5@redhat.com> Content-Language: en-US From: Usama Arif In-Reply-To: <2d30bcce-6f80-468f-945d-b63eff726db5@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 15/05/2025 15:44, David Hildenbrand wrote: > On 15.05.25 16:40, Lorenzo Stoakes wrote: >> Overall I feel this series should _DEFINITELY_ be an RFC. This is pretty >> outlandish stuff and needs discussion. >> >> You're basically making it so /sys/kernel/mm/transparent_hugepage/enabled = >> never is completely ignored and overridden. > > I thought I made it very clear during earlier discussions that never means never. > Yes never means never, this is only implementing your suggestion in the original series. If the policy is set to never, hugepage_global_always and hugepage_global_enabled will evaluate to false and we wont get a hugepage.