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b=Y24iLrISIRCxqBy09WsFAtvLEaKG6le4hUJgBLkg4y/DYrgWr6N6Ei/HxjnURUs3t T4M4rspvFEOWnkkrwF2e9DsvwykqFjeEKwZaJYimS2AzBKTOzDARvlZoNyIbMVNsIi 262yr/Os9fyYOTcmj/QJohN5MjUch00k0S3WV7IZ79VSv2TpedqPjrs3sl7/tYZOTR zSDAF+vAqhTG5Sxn7t4957as4SrjDqPUafo08znQOIL+LGNmSjCi2tFkKJ7DKXAWCz FDZ/aNtW0Qe0lAB3EzfJ9orSGzFOiOTScw17mUHw+0TelN3m/+Bdm3z3ufvknNZtIE NWE0r0B1CZmFg== Message-ID: <0c90b9ae-48ac-407f-9d73-4c501c82cf40@kernel.org> Date: Thu, 6 Aug 2026 16:11:21 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/4] mm/mempolicy: skip zone device folios when queueing folios To: "Lorenzo Stoakes (ARM)" Cc: Gregory Price , linux-mm@kvack.org, damon@lists.linux.dev, linux-kernel@vger.kernel.org, kernel-team@meta.com, sj@kernel.org, akpm@linux-foundation.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, liam@infradead.org, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, vbabka@kernel.org, jannh@google.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, ying.huang@linux.alibaba.com, apopple@nvidia.com References: <20260728194714.3713735-1-gourry@gourry.net> <20260728194714.3713735-5-gourry@gourry.net> <82f6afba-756c-4ffd-bd5d-c3432179af28@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: CD53F40009 X-Stat-Signature: eey8wgtja84mrxou3zyei8wm1bwsmnt7 X-HE-Tag: 1786025491-487077 X-HE-Meta: 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 Lf5wyEyK mrnudqRjNaIt/MZc3e9YPN/vtpx0IV3wJisu34eKAQe0g62OC4/X9LlA2/LhbErfC5mhWgXZF35OggChrvRJGlfPcELqcI35d65H1j98uy78d+7OqZdOEOdpYU8Ugr8xJmp+O6ytm8jMTrYbv6NQAf/AYHfX8Riz7oCHHM7SgMxbiIADb08yWgw10UurZuOH1tkLjHfJukI/DEvIjXIxWqkkmP+x+8EnDUTWPKOjpVvYrhijFkso1LMT5DbwtVl05UWrGoIjOknsddUR5cQdevz2+RXcGmkVn0JTKqKbreMlpM+nfyZXMaybaycc5zb9rlvMQcrNlZoSl/Do= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/6/26 15:36, Lorenzo Stoakes (ARM) wrote: > On Thu, Aug 06, 2026 at 03:25:50PM +0200, David Hildenbrand (Arm) wrote: >> On 7/28/26 21:47, Gregory Price wrote: >>> mm/mempolicy.c | 4 ++++ >>> @@ -797,6 +799,8 @@ static int queue_folios_hugetlb(pte_t *pte, unsigned long hmask, >>> folio = pfn_folio(pte_pfn(ptep)); >>> if (!queue_folio_required(folio, qp)) >>> goto unlock; >>> + if (folio_is_zone_device(folio)) >>> + goto unlock; >> >> Leave the hugetlb part alone. hugetlb folios will never be ZONE_DEVICE. > > :P > > But dear God we have got to find ways to stop hugetlb being this big stupid > nightmare that every single path of mm has to put an asterix next to itself > about! Yeah, possibly unifying the code (possibly, because it's a mess) but not replicating checks that don't make any sense for hugetlb. -- Cheers, David