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[87.161.175.67]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-458691b2adesm29652445e9.32.2025.07.23.11.02.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Jul 2025 11:02:54 -0700 (PDT) Message-ID: <383a957e-badb-49fc-9913-30bea3a1c5a8@redhat.com> Date: Wed, 23 Jul 2025 20:02:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH POC] prctl: extend PR_SET_THP_DISABLE to optionally exclude VM_HUGEPAGE To: Usama Arif , linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, Jonathan Corbet , Andrew Morton , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , SeongJae Park , Jann Horn , Yafang Shao , Matthew Wilcox References: <20250721090942.274650-1-david@redhat.com> <4a8b70b1-7ba0-4d60-a3a0-04ac896a672d@gmail.com> <5968efc3-50ac-465a-a51b-df91fc1a930a@redhat.com> <003c12a7-cb3b-4bbd-86ac-4caaddcabf26@gmail.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAmgsLPQFCRvGjuMACgkQTd4Q 9wD/g1o0bxAAqYC7gTyGj5rZwvy1VesF6YoQncH0yI79lvXUYOX+Nngko4v4dTlOQvrd/vhb 02e9FtpA1CxgwdgIPFKIuXvdSyXAp0xXuIuRPQYbgNriQFkaBlHe9mSf8O09J3SCVa/5ezKM OLW/OONSV/Fr2VI1wxAYj3/Rb+U6rpzqIQ3Uh/5Rjmla6pTl7Z9/o1zKlVOX1SxVGSrlXhqt kwdbjdj/csSzoAbUF/duDuhyEl11/xStm/lBMzVuf3ZhV5SSgLAflLBo4l6mR5RolpPv5wad GpYS/hm7HsmEA0PBAPNb5DvZQ7vNaX23FlgylSXyv72UVsObHsu6pT4sfoxvJ5nJxvzGi69U s1uryvlAfS6E+D5ULrV35taTwSpcBAh0/RqRbV0mTc57vvAoXofBDcs3Z30IReFS34QSpjvl Hxbe7itHGuuhEVM1qmq2U72ezOQ7MzADbwCtn+yGeISQqeFn9QMAZVAkXsc9Wp0SW/WQKb76 FkSRalBZcc2vXM0VqhFVzTb6iNqYXqVKyuPKwhBunhTt6XnIfhpRgqveCPNIasSX05VQR6/a OBHZX3seTikp7A1z9iZIsdtJxB88dGkpeMj6qJ5RLzUsPUVPodEcz1B5aTEbYK6428H8MeLq NFPwmknOlDzQNC6RND8Ez7YEhzqvw7263MojcmmPcLelYbfOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCaCwtJQUJG8aPFAAKCRBN3hD3AP+DWlDnD/4k2TW+HyOOOePVm23F5HOhNNd7nNv3 Vq2cLcW1DteHUdxMO0X+zqrKDHI5hgnE/E2QH9jyV8mB8l/ndElobciaJcbl1cM43vVzPIWn 01vW62oxUNtEvzLLxGLPTrnMxWdZgxr7ACCWKUnMGE2E8eca0cT2pnIJoQRz242xqe/nYxBB /BAK+dsxHIfcQzl88G83oaO7vb7s/cWMYRKOg+WIgp0MJ8DO2IU5JmUtyJB+V3YzzM4cMic3 bNn8nHjTWw/9+QQ5vg3TXHZ5XMu9mtfw2La3bHJ6AybL0DvEkdGxk6YHqJVEukciLMWDWqQQ RtbBhqcprgUxipNvdn9KwNpGciM+hNtM9kf9gt0fjv79l/FiSw6KbCPX9b636GzgNy0Ev2UV m00EtcpRXXMlEpbP4V947ufWVK2Mz7RFUfU4+ETDd1scMQDHzrXItryHLZWhopPI4Z+ps0rB CQHfSpl+wG4XbJJu1D8/Ww3FsO42TMFrNr2/cmqwuUZ0a0uxrpkNYrsGjkEu7a+9MheyTzcm vyU2knz5/stkTN2LKz5REqOe24oRnypjpAfaoxRYXs+F8wml519InWlwCra49IUSxD1hXPxO WBe5lqcozu9LpNDH/brVSzHCSb7vjNGvvSVESDuoiHK8gNlf0v+epy5WYd7CGAgODPvDShGN g3eXuA== Organization: Red Hat In-Reply-To: <003c12a7-cb3b-4bbd-86ac-4caaddcabf26@gmail.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: p-p8RH_iPuG4yCwDm0JUuMRTWuaPTXoiUtrWtWrhi08_1753293776 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 053F5C000C X-Rspamd-Server: rspam06 X-Stat-Signature: sfjp1hy93kgeeufoc6q9ktnqbzfcgo7h X-HE-Tag: 1753293779-435177 X-HE-Meta: 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 EpPlwOwI 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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: On 23.07.25 19:07, Usama Arif wrote: >>> Thanks for the patch David! >>> >>> As discussed in the other thread, with the below diff >>> >>> diff --git a/kernel/sys.c b/kernel/sys.c >>> index 2a34b2f70890..3912f5b6a02d 100644 >>> --- a/kernel/sys.c >>> +++ b/kernel/sys.c >>> @@ -2447,7 +2447,7 @@ static int prctl_set_thp_disable(unsigned long thp_disable, unsigned long flags, >>>                  return -EINVAL; >>>            /* Flags are only allowed when disabling. */ >>> -       if (!thp_disable || (flags & ~PR_THP_DISABLE_EXCEPT_ADVISED)) >>> +       if ((!thp_disable && flags) || (flags & ~PR_THP_DISABLE_EXCEPT_ADVISED)) >>>                  return -EINVAL; >>>          if (mmap_write_lock_killable(current->mm)) >>>                  return -EINTR; >>> >>> >>> I tested with the below selftest, and it works. It hopefully covers >>> majority of the cases including fork and re-enabling THPs. >>> Let me know if it looks ok and please feel free to add this in the >>> next revision you send. >>> >>> >>> Once the above diff is included, please feel free to add >>> >>> Acked-by: Usama Arif >>> Tested-by: Usama Arif >> >> Thanks! >> >> The latest version lives at >> >>   https://github.com/davidhildenbrand/linux/tree/PR_SET_THP_DISABLE >> >> With all current review feedback addressed (primarily around description+comments) + that one fix. >> >> > > Hi David, > > Just wanted to check if the above branch is up to date? > No, I forgot to push. Now pushed. This is the diff (excluding description changes): diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index c4127104d9bc3..527aa4c9645fd 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -324,8 +324,8 @@ struct thpsize { (1<mm->flags; @@ -2447,7 +2447,7 @@ static int prctl_set_thp_disable(unsigned long thp_disable, unsigned long flags, return -EINVAL; /* Flags are only allowed when disabling. */ - if (!thp_disable || (flags & ~PR_THP_DISABLE_EXCEPT_ADVISED)) + if ((!thp_disable && flags) || (flags & ~PR_THP_DISABLE_EXCEPT_ADVISED)) return -EINVAL; if (mmap_write_lock_killable(current->mm)) return -EINTR; -- Cheers, David / dhildenb