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[2003:d8:2f11:2400:5d0a:b6ec:2ac0:666f]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45a1a5212b2sm8133575e9.16.2025.08.13.09.24.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 Aug 2025 09:24:12 -0700 (PDT) Message-ID: Date: Wed, 13 Aug 2025 18:24:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 7/7] selftests: prctl: introduce tests for disabling THPs except for madvise To: Lorenzo Stoakes , Usama Arif Cc: Andrew Morton , linux-mm@kvack.org, 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, 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: <20250813135642.1986480-1-usamaarif642@gmail.com> <20250813135642.1986480-8-usamaarif642@gmail.com> <13220ee2-d767-4133-9ef8-780fa165bbeb@lucifer.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 41CFE160012 X-Stat-Signature: csm8g9rf3x4ggfibjfu6s7n4fagqzuro X-Rspam-User: X-HE-Tag: 1755102257-782000 X-HE-Meta: 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 O/bmKbih 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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: >> + >> +FIXTURE_SETUP(prctl_thp_disable_except_madvise) >> +{ >> + 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"); >> + >> + if (prctl(PR_SET_THP_DISABLE, 1, PR_THP_DISABLE_EXCEPT_ADVISED, NULL, NULL)) >> + SKIP(return, "Unable to set PR_THP_DISABLE_EXCEPT_ADVISED\n"); > > This should be a test fail I think, as the only ways this could fail are > invalid flags, or failure to obtain an mmap write lock. Running a kernel that does not support it? We could check the errno to distinguish I guess. -- Cheers, David / dhildenb