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[2003:d8:2f22:600:53c7:df43:7dc3:ae39]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3bb64758690sm12914199f8f.6.2025.08.18.06.06.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 Aug 2025 06:06:02 -0700 (PDT) Message-ID: Date: Mon, 18 Aug 2025 15:06:00 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 7/7] selftests: prctl: introduce tests for disabling THPs except for madvise 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: <20250815135549.130506-1-usamaarif642@gmail.com> <20250815135549.130506-8-usamaarif642@gmail.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 651521C001B X-Rspam-User: X-Stat-Signature: 9ckutxbq69w1d59a1kk1w7d1dbp1tchf X-Rspamd-Server: rspam09 X-HE-Tag: 1755522366-965607 X-HE-Meta: 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 MRtCi+ts 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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 15.08.25 15:54, Usama Arif wrote: > The test will set the global system THP setting to never, madvise > or always depending on the fixture variant and the 2M setting to > inherit before it starts (and reset to original at teardown). > The fixture setup will also test if PR_SET_THP_DISABLE prctl call can > be made with PR_THP_DISABLE_EXCEPT_ADVISED and skip if it fails. > > This tests if the process can: > - successfully get the policy to disable THPs expect for madvise. > - get hugepages only on MADV_HUGE and MADV_COLLAPSE if the global policy > is madvise/always and only with MADV_COLLAPSE if the global policy is > never. > - successfully reset the policy of the process. > - after reset, only get hugepages with: > - MADV_COLLAPSE when policy is set to never. > - MADV_HUGE and MADV_COLLAPSE when policy is set to madvise. > - always when policy is set to "always". > - never get a THP with MADV_NOHUGEPAGE. > - repeat the above tests in a forked process to make sure the policy is > carried across forks. > > Test results: > ./prctl_thp_disable > TAP version 13 > 1..12 > ok 1 prctl_thp_disable_completely.never.nofork > ok 2 prctl_thp_disable_completely.never.fork > ok 3 prctl_thp_disable_completely.madvise.nofork > ok 4 prctl_thp_disable_completely.madvise.fork > ok 5 prctl_thp_disable_completely.always.nofork > ok 6 prctl_thp_disable_completely.always.fork > ok 7 prctl_thp_disable_except_madvise.never.nofork > ok 8 prctl_thp_disable_except_madvise.never.fork > ok 9 prctl_thp_disable_except_madvise.madvise.nofork > ok 10 prctl_thp_disable_except_madvise.madvise.fork > ok 11 prctl_thp_disable_except_madvise.always.nofork > ok 12 prctl_thp_disable_except_madvise.always.fork > > Signed-off-by: Usama Arif > --- Acked-by: David Hildenbrand -- Cheers David / dhildenb