From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 217CD2264DB for ; Tue, 5 Aug 2025 12:55:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754398536; cv=none; b=Xdix8dnxxTUKYbRCAbzTaEkC+8uPOG64/KM6W/OL8dsPsUsEb0AzhA+mOTJTbxVaJXKkaXjpe+lS6Du8ycIUbMAAFa2EfxwBK0rwLt+XWTcYiP2G+YKMKZKPc7GLqw7RyF34FRiZDvs/GxZhoJ9lVmxuXNOq7FtcOfFlCM9Ee0Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754398536; c=relaxed/simple; bh=HOB22G3loRJWaKMt8mwgyEJ+zx+KC090srXh72+31xc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=oNaATnTYR/XL84/RekTGT1Vsb8Pwk5j7ZK6axGF4qDMrXIDmQgE7rM9xt7ZC1acXjOs1WE4kJ570tcafOUTkRRyTVuijYwLSblz18RAm8I4H4jTM7ZqnoZG7zSHQh586gR8qswqOzd++/jWwhSqmHSCOcUaaLoACznP6LNCv0iI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=gLqWAxpm; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="gLqWAxpm" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1754398532; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=mXQVWi/b7AMP+vy5HeVixIeMAJNnKqw2TByOJlo+1Us=; b=gLqWAxpmQqCzd/dSWzef/PnSJIzfnHjn8Y6z2TccJRWouJ89oLxRJWP1OCFx8rCwNO7KfS g5CE9Th47pr0UDeoqSLR3RSRQOQIgNCZ9voiFlvQKXUtUalgp3QXF8q/3+ncHIZddHIXDD vKSkhO8eri1w8oMnYVBNgG850IFKO20= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-392-9aahfoVtOpeYoKn1FQxKTg-1; Tue, 05 Aug 2025 08:55:31 -0400 X-MC-Unique: 9aahfoVtOpeYoKn1FQxKTg-1 X-Mimecast-MFC-AGG-ID: 9aahfoVtOpeYoKn1FQxKTg_1754398530 Received: by mail-wr1-f72.google.com with SMTP id ffacd0b85a97d-3b7961b3c82so2495332f8f.0 for ; Tue, 05 Aug 2025 05:55:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754398530; x=1755003330; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:cc:to:subject:user-agent :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=mXQVWi/b7AMP+vy5HeVixIeMAJNnKqw2TByOJlo+1Us=; b=BybMfT1SnSyN+Xolv7NycnUnvNKROlp/i0v2/iA1pNS2hLkoN+f6no8vL29/Cevvj0 5YAtTmcqgl5V6VV0Nw3bz/AGrPTJtIyI5kY2XmGPIlPZAB3APyat3R7wLjP0/to44ftQ cIXw1aj1aj2kYgD+Tzl8B/aCYkhIcGS7neIxAGsQ9CfRsxJCXEL7Hp469r9vrgyKz39v L2+YA6oh2zDC8RP4y+y9DP2394gSNIJ+LRVMLMbvPFIHYYyMOHbph9sMT9GT+fJvESZg r30760X8ldYjzPrCPmX/qMi+2j4HOpXkKK7MNzuxUewP23kcywiHGKUbV3/2q05tKC/6 yDAQ== X-Forwarded-Encrypted: i=1; AJvYcCUo+7X2u4gwCt3vfta7LO5uvOwXzypBdqZfTSdcUgpNIIgnWXnA2DlxABHAQZJj79NVxMNmbGZ3bdQ=@vger.kernel.org X-Gm-Message-State: AOJu0YzT7zsnZiX7UQnMdhIRvxUhNwzjKeKHawEMH2WXWXacK96u5gJB /GxqG7nxjCU3XsF9thxKPm+wS0ZuNyHohjH1E7Uj48/GvjrEeVKuYCDvkRfnP9K50TkUJRC/YuE L+io24Lma9VU2iGP6OI8CfooKl2lxsIiUMGQ3W8zCD1yvSX50iip6wMbU7sENZg== X-Gm-Gg: ASbGncuAnLwL6y/3IwktJsuA40wFFl3OL1mpNQUpwYX3WfjIHgDzjVgPFNDTU9YruXx R0VqHdb6oGRdar+ASWjsRckaqOOxCgmYKsC+l5sLAQqDcTJch5C2zTOygCcyY3T296eGtpFv46r 8aSSQQtOpOXDtW5wuzniQcCwym7Fh8Z4cpstkIi3xL/HJTwWRABcHNrJzhAGprSEuOKKvLTJzaD tiWILgeeq3CR2QuiQgqAVfPp7ChufPPFtch4uy8QH1Q4R9cZaLxbCFv4h+ezdjXMfcSorMbcwUt L8hC/UsO4bzVlMEfn74377cUS5R06abm22D7Vd7/F84Fx0Jqn1p1nounAyXUJoJ80qdKx58= X-Received: by 2002:a05:6000:2287:b0:3b8:d2d1:5c11 with SMTP id ffacd0b85a97d-3b8d94d3549mr10242830f8f.51.1754398530402; Tue, 05 Aug 2025 05:55:30 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHoW0VEHeHdM6KbOLWiBmAjo9TG0Lqe1CZviyoNOwGriAOTp++1O5KXtJScToSn/9LRd7ABaA== X-Received: by 2002:a05:6000:2287:b0:3b8:d2d1:5c11 with SMTP id ffacd0b85a97d-3b8d94d3549mr10242807f8f.51.1754398529950; Tue, 05 Aug 2025 05:55:29 -0700 (PDT) Received: from [192.168.3.141] (p57a1a26f.dip0.t-ipconnect.de. [87.161.162.111]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b79c4534b3sm19065920f8f.47.2025.08.05.05.55.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Aug 2025 05:55:29 -0700 (PDT) Message-ID: Date: Tue, 5 Aug 2025 14:55:27 +0200 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 5/6] selftests: prctl: introduce tests for disabling THPs completely To: Usama Arif , Andrew Morton , linux-mm@kvack.org Cc: linux-fsdevel@vger.kernel.org, corbet@lwn.net, rppt@kernel.org, surenb@google.com, mhocko@suse.com, hannes@cmpxchg.org, baohua@kernel.org, shakeel.butt@linux.dev, riel@surriel.com, ziy@nvidia.com, laoar.shao@gmail.com, dev.jain@arm.com, baolin.wang@linux.alibaba.com, npache@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, vbabka@suse.cz, jannh@google.com, Arnd Bergmann , sj@kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kernel-team@meta.com References: <20250804154317.1648084-1-usamaarif642@gmail.com> <20250804154317.1648084-6-usamaarif642@gmail.com> <66c2b413-fa60-476a-b88f-542bbda9c89c@redhat.com> From: David Hildenbrand Content-Language: en-US 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: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 05.08.25 14:46, Usama Arif wrote: > > > On 05/08/2025 13:39, David Hildenbrand wrote: >>> +FIXTURE_SETUP(prctl_thp_disable_completely) >>> +{ >>> +    if (!thp_available()) >>> +        SKIP(return, "Transparent Hugepages not available\n"); >>> + >>> +    self->pmdsize = read_pmd_pagesize(); >>> +    if (!self->pmdsize) >>> +        SKIP(return, "Unable to read PMD size\n"); >>> + >>> +    thp_save_settings(); >>> +    thp_read_settings(&self->settings); >>> +    self->settings.thp_enabled = variant->thp_policy; >>> +    self->settings.hugepages[sz2ord(self->pmdsize, getpagesize())].enabled = THP_INHERIT; >> >> Oh, one more thing: should we set all other sizes also to THP_INHERIT or (for simplicity) THP_NEVER? >> > > hmm do we need to? I am hoping that we should always get the PMD size THP no matter what the policy > for others is in the scenario we have? Assuming 64K is set to "always", couldn't it mislead us in the "madvise"/"never" test cases in some scenarios? -- Cheers, David / dhildenb