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[2003:d8:2f4a:8900:884a:b3af:e3c9:ec88]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a35ca4d31fsm364329f8f.6.2025.05.15.12.12.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 May 2025 12:12:15 -0700 (PDT) Message-ID: <5f77366d-e100-46bb-ac85-aa4b216eb2cf@redhat.com> Date: Thu, 15 May 2025 21:12:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/6] prctl: introduce PR_THP_POLICY_DEFAULT_HUGE for the process To: Lorenzo Stoakes Cc: Usama Arif , 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> <02ead03b-339b-45c8-b252-d31a66501c39@lucifer.local> <3a2a329d-2592-4e31-a763-d87dcd925966@redhat.com> <8ea288f2-5196-41f9-bd65-e29f22bb29e8@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: rspam08 X-Rspamd-Queue-Id: 2EDD040004 X-Stat-Signature: 71mpp7o8wtm3fntwkwasnzep3g6rodhd X-Rspam-User: X-HE-Tag: 1747336340-886362 X-HE-Meta: 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 bxEkK/JB M4rYH7XUnen7nEtE1QZtHz59wFv+W+znSp4o9QJOCasXFkQ93Uef4fltIxQz7FmFIGs4ZstR+AqWA2jD000/ES/WV8HBnJMn91ImUcGRi8aJngBt+FDHAoLhWkbyoYuwMm7sAjaCnHJ5vjGIk4PUqmNLdlqyiS5FwziyBxh4tR+DLRRJOFG3WJLdOt2wD+/7AScQqgDogb1k+jOaMkWBbWuhJ+Kyb+wg6Aq4jdRbYYNwIcGTY+X4/IAQ6jGyLdBjnFz1rtQoaZF0hjaGkuXNLNxsvFKz5NAdJKQF8EXwHo5gnOrNOSzlXSC8rtKVLKiFfS4myK7CRq36m69LhGw0GWp+jLqKHnHeHzyjEDIrZeWAGIXVmdhmuuu1heK8pbii2CSHoDDFzC7c5Lvyh4L0ZZrMomOs/ZtsjCyaFinVLNOrw59e+sz7dQ7wj3+YTH908q1bLjqrvQTQ020gkulCsGxzbK9QAyDIzF3HVLo5+ItlAIL9xi4aWa7NwV5OeFTGAeSly633nEzF9yqU= 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 15.05.25 20:08, Lorenzo Stoakes wrote: > On Thu, May 15, 2025 at 06:11:55PM +0200, David Hildenbrand wrote: >>>>> So if you're not overriding VM_NOHUGEPAGE, the whole point of this exercise >>>>> is to override global 'never'? >>>>> >>>> >>>> Again, I am not overriding never. >>>> >>>> hugepage_global_always and hugepage_global_enabled will evaluate to false >>>> and you will not get a hugepage. >>> >>> Yeah, again ack, but I kind of hate that we set VM_HUGEPAGE everywhere even >>> if the policy is never. >> >> I think it should behave just as if someone does manually an madvise(). So >> whatever we do here during an madvise, we should try to do the same thing >> here. > > Ack I agree with this. > > It actually simplifies things a LOT to view it this way - we're saying 'by > default apply madvise(...) to new VMAs'. > > Hm I wonder if we could have a more generic version of this... > > Note though that we're not _quite_ doing this. > > So in hugepage_madvise(): > > int hugepage_madvise(struct vm_area_struct *vma, > unsigned long *vm_flags, int advice) > { > ... > > switch (advice) { > case MADV_HUGEPAGE: > *vm_flags &= ~VM_NOHUGEPAGE; > *vm_flags |= VM_HUGEPAGE; > > ... > > break; > > ... > } > > ... > } > > So here we're actually clearing VM_NOHUGEPAGE and overriding it, but in the > proposed code we're not. Yeah, I think I suggested that, but probably we should just do exactly what madvise() does. > > So we're back into confusing territory again :) > > I wonder if we could... > > 1. Add an MADV_xxx that mimics the desired behaviour here. > > 2. Add a generic 'madvise() by default' thing at a process level? > > Is this crazy? I think that's what I had in mind, just a bit twisted. What could work is 1) prctl to set the default 2) madvise() to adjust all existing VMAs We might have to teach 2) to ignore non-compatible VMAs / holes. Maybe not, worth an investigation. -- Cheers, David / dhildenb