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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Stat-Signature: 35uj5u1e3dkt3maqrkk3o8se43fwwgm6 X-Rspamd-Queue-Id: D0BED10000F X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1719823707-974142 X-HE-Meta: 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 s2Jl5ipH TODCyGUJ/JRA+fjHWOZ9eQd7oTf5be6KFm275kGUBvjnydCFYu6O9FOV8hbiQLw7kFRCxJ8uhsZ+0ZjDgcQQAPar16WhLe3fUBgiKMheyNNpwC8s+9O5J4JNBS22s7+6Oao3rACyxUS9/KdEkPxB54kaC9oVTGnL168CVOlLR8eHL4WV41M/A7+MhRHYU4JoLYau7i9Esp7xicG3gH9f0qPRawXMnd3TLNVMlezlDuEou+5ZXM+SwxaO2lUoblQRjCaNj7feqmvDLkiLmVN/vXbLYJQaUvH1rYAvVUSMaAs12vY7LnY1k58UEBiB6VLnhjZ2KUV8PrzOyuAFmHY9qFAQ6kmeWLvYLVwRkD7W9uDIhzsEOERAPjduQ2YfDj8NeBnqcugaZmugG929z96rQmbZeAFyhkz9ROZ551UPix179HTY= 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 01.07.24 10:40, Ryan Roberts wrote: > On 01/07/2024 09:33, Baolin Wang wrote: >> >> >> On 2024/7/1 15:55, Ryan Roberts wrote: >>> On 28/06/2024 11:49, Bang Li wrote: >>>> After the commit 7fb1b252afb5 ("mm: shmem: add mTHP support for >>>> anonymous shmem"), we can configure different policies through >>>> the multi-size THP sysfs interface for anonymous shmem. But >>>> currently "THPeligible" indicates only whether the mapping is >>>> eligible for allocating THP-pages as well as the THP is PMD >>>> mappable or not for anonymous shmem, we need to support semantics >>>> for mTHP with anonymous shmem similar to those for mTHP with >>>> anonymous memory. >>>> >>>> Signed-off-by: Bang Li >>>> --- >>>>   fs/proc/task_mmu.c      | 10 +++++++--- >>>>   include/linux/huge_mm.h | 11 +++++++++++ >>>>   mm/shmem.c              |  9 +-------- >>>>   3 files changed, 19 insertions(+), 11 deletions(-) >>>> >>>> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c >>>> index 93fb2c61b154..09b5db356886 100644 >>>> --- a/fs/proc/task_mmu.c >>>> +++ b/fs/proc/task_mmu.c >>>> @@ -870,6 +870,7 @@ static int show_smap(struct seq_file *m, void *v) >>>>   { >>>>       struct vm_area_struct *vma = v; >>>>       struct mem_size_stats mss = {}; >>>> +    bool thp_eligible; >>>>         smap_gather_stats(vma, &mss, 0); >>>>   @@ -882,9 +883,12 @@ static int show_smap(struct seq_file *m, void *v) >>>>         __show_smap(m, &mss, false); >>>>   -    seq_printf(m, "THPeligible:    %8u\n", >>>> -           !!thp_vma_allowable_orders(vma, vma->vm_flags, >>>> -               TVA_SMAPS | TVA_ENFORCE_SYSFS, THP_ORDERS_ALL)); >>>> +    thp_eligible = !!thp_vma_allowable_orders(vma, vma->vm_flags, >>>> +                        TVA_SMAPS | TVA_ENFORCE_SYSFS, THP_ORDERS_ALL); >>>> +    if (vma_is_anon_shmem(vma)) >>>> +        thp_eligible = !!shmem_allowable_huge_orders(file_inode(vma->vm_file), >>>> +                            vma, vma->vm_pgoff, thp_eligible); >>> >>> Afraid I haven't been following the shmem mTHP support work as much as I would >>> have liked, but is there a reason why we need a separate function for shmem? >> >> Since shmem_allowable_huge_orders() only uses shmem specific logic to determine >> if huge orders are allowable, there is no need to complicate the >> thp_vma_allowable_orders() function by adding more shmem related logic, making >> it more bloated. In my view, providing a dedicated helper >> shmem_allowable_huge_orders(), specifically for shmem, simplifies the logic. > > My point was really that a single interface (thp_vma_allowable_orders) should be > used to get this information. I have no strong opinon on how the implementation > of that interface looks. What you suggest below seems perfectly reasonable to me. Right. thp_vma_allowable_orders() might require some care as discussed in other context (cleanly separate dax and shmem handling/orders). But that would be follow-up cleanups. -- Cheers, David / dhildenb