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[2003:cb:c73b:5600:c716:d8e0:609d:ae92]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-388c8060905sm12357212f8f.99.2024.12.17.14.27.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Dec 2024 14:27:15 -0800 (PST) Message-ID: <4b5768b7-96e0-4864-9dbe-88fd1f0e87b8@redhat.com> Date: Tue, 17 Dec 2024 23:27:13 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 14/25] rmap: Add support for PUD sized mappings to rmap To: Alistair Popple , akpm@linux-foundation.org, dan.j.williams@intel.com, linux-mm@kvack.org Cc: lina@asahilina.net, zhang.lyra@gmail.com, gerald.schaefer@linux.ibm.com, vishal.l.verma@intel.com, dave.jiang@intel.com, logang@deltatee.com, bhelgaas@google.com, jack@suse.cz, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, dave.hansen@linux.intel.com, ira.weiny@intel.com, willy@infradead.org, djwong@kernel.org, tytso@mit.edu, linmiaohe@huawei.com, peterx@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com References: <7f739c9e9f0a25cafb76a482e31e632c8f72102e.1734407924.git-series.apopple@nvidia.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: A3B6DC0014 X-Rspamd-Server: rspam12 X-Stat-Signature: wghmkpb77f9uqa77yreqo6jd1eytmis7 X-Rspam-User: X-HE-Tag: 1734474407-759237 X-HE-Meta: U2FsdGVkX18WohFLGxgufUlLVDMCKwA4fv6iY1ShCyS7b2KwE82aTueREd3j8oa1YHP1C/6sfn7q7gW26R5iIGs2d6ShJ91KgBtzihV5y0G6Ppp43hdyCKVUwmmBRxb+2gGcLfhPQsDga+A6Ole1JyVjXvwr9SCtIiyvg/rbgWJ73UdHHlTuc9z44068Xgs6nztV/fl+cl03ziROWWA/WQtchEZ2y+uQm7CtlnGF497UdRbOrTacGIWn8zklfLbhOJOMdIuItpKaTa0BAkzgYktOWO0Z5/ozNDLWknIVvjy8JEMvWeKoKsKVS9inCfMHZceFA1gAVxlEoWEaiEMcaJ+O6PY2k/ccflQKxb6grylouf6UlIPKRko9CurHgt36amtgiWzx9+mgzYBwFaLblwyqhm9Cxlt5z3fYvjscbwA/960jhQL9PidtUoafkoyi7mAYH/lp1YKuKIUwrKgGttHpPfC3LUV+Mm9fIPFpzSnXzWuGHW1VYP4oLY5mvJO9Exv0gOMiEslXT/FGjFIAhhKvmZD/IjmlKL4bpXracOw4EGpSB0Bz/kueTxWH4VE4tCrt6jZjA59TDcexzpkSVPemjNVB3WIBRCRGzPEPZfMYXlNBdbUYJ+MK4RD30swh9fyNh4hrsRJLdiTAFi/+mkpUaHjHIbaXqaikFwT4Lg0I1EhqS9uy6crUNLll69RAdeLvKwmdJQUPjt6H/WxSIC25LOIxjzWjc/ISbJYj+ANDpeugbnBx6JzqualThLz8OUJ/yz+V/DfiObt+PinUGFweHFUyetRAR6umMwyJLOBqPfxX4y5Q7MLxZjOa8MDJ5nmJNYliYsc63SF27QDbPZGOMog1lj/zRnXHE1ldWJWSQJGc130JdpuPKp+2TajW2vXEPek2IcyGPgyLblZ+YVU4WduMueZIfEMBCbn1zbkN0g7WKRo+PPDLun+AxR0FUMRFyhhldS3ykwAVUMZ 59K2GOTl +iGOagv8Og7aXik2ysUafIANtGVA5/vVTKNnWbIqAFnKVtEAhVnN6LNKp+y5uKca29tUkY/3WNbP+hTOdwPPVLz1BYTuCEQkmXEOnqT1z5I/P3wQYIgsBhaRy0FG0i9A3aVzx/CLnApgeiHHYBar3U+XJi47kjcMVMOid12woit5cqEMkecDN0zGHzb+XLrdcSutJ80hPnN2cMBCX8AtOLPZ+FI8z9huqddNeyN/gpVK6KNPmR13Hqv2gtqBbTSCqPU6LrINsBC/i16Algx8j4CsmuSSppwduBREu1I5BBzkzGEBRqzppgAU8QxRyPrxl3ygdnbSJ9sfmb5QAIBCYTNyoU7nq+Y7GYmcfHzbUKG5mBfG17UIAFEQxSXzKnTzm+PAyilVTctQ0QdKnn6ucaOsGWLuM2NgPkb7hfxZeRFuQDMEf9oRlJ0vPco3TrlqWnUMUwIkjXB5m1CBKQF0+hYGz7gOXe5Kue8dewiq8stNzbe0= 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 17.12.24 06:12, Alistair Popple wrote: > The rmap doesn't currently support adding a PUD mapping of a > folio. This patch adds support for entire PUD mappings of folios, > primarily to allow for more standard refcounting of device DAX > folios. Currently DAX is the only user of this and it doesn't require > support for partially mapped PUD-sized folios so we don't support for > that for now. > > Signed-off-by: Alistair Popple > > --- > > David - Thanks for your previous comments, I'm less familiar with the > rmap code so I would appreciate you taking another look. In particular > I haven't added a stat for PUD mapped folios as it seemed like > overkill for just the device DAX case but let me know if you think > otherwise. > > Changes for v4: > > - New for v4, split out rmap changes as suggested by David. > --- > include/linux/rmap.h | 15 ++++++++++++- > mm/rmap.c | 56 +++++++++++++++++++++++++++++++++++++++++++++- > 2 files changed, 71 insertions(+) > > diff --git a/include/linux/rmap.h b/include/linux/rmap.h > index 683a040..7043914 100644 > --- a/include/linux/rmap.h > +++ b/include/linux/rmap.h > @@ -192,6 +192,7 @@ typedef int __bitwise rmap_t; > enum rmap_level { > RMAP_LEVEL_PTE = 0, > RMAP_LEVEL_PMD, > + RMAP_LEVEL_PUD, > }; > > static inline void __folio_rmap_sanity_checks(const struct folio *folio, > @@ -228,6 +229,14 @@ static inline void __folio_rmap_sanity_checks(const struct folio *folio, > VM_WARN_ON_FOLIO(folio_nr_pages(folio) != HPAGE_PMD_NR, folio); > VM_WARN_ON_FOLIO(nr_pages != HPAGE_PMD_NR, folio); > break; > + case RMAP_LEVEL_PUD: > + /* > + * Assume that we are creating * a single "entire" mapping of the > + * folio. > + */ > + VM_WARN_ON_FOLIO(folio_nr_pages(folio) != HPAGE_PUD_NR, folio); > + VM_WARN_ON_FOLIO(nr_pages != HPAGE_PUD_NR, folio); > + break; > default: > VM_WARN_ON_ONCE(true); > } > @@ -251,12 +260,16 @@ void folio_add_file_rmap_ptes(struct folio *, struct page *, int nr_pages, > folio_add_file_rmap_ptes(folio, page, 1, vma) > void folio_add_file_rmap_pmd(struct folio *, struct page *, > struct vm_area_struct *); > +void folio_add_file_rmap_pud(struct folio *, struct page *, > + struct vm_area_struct *); > void folio_remove_rmap_ptes(struct folio *, struct page *, int nr_pages, > struct vm_area_struct *); > #define folio_remove_rmap_pte(folio, page, vma) \ > folio_remove_rmap_ptes(folio, page, 1, vma) > void folio_remove_rmap_pmd(struct folio *, struct page *, > struct vm_area_struct *); > +void folio_remove_rmap_pud(struct folio *, struct page *, > + struct vm_area_struct *); > > void hugetlb_add_anon_rmap(struct folio *, struct vm_area_struct *, > unsigned long address, rmap_t flags); > @@ -341,6 +354,7 @@ static __always_inline void __folio_dup_file_rmap(struct folio *folio, > atomic_add(orig_nr_pages, &folio->_large_mapcount); > break; > case RMAP_LEVEL_PMD: > + case RMAP_LEVEL_PUD: > atomic_inc(&folio->_entire_mapcount); > atomic_inc(&folio->_large_mapcount); > break; > @@ -437,6 +451,7 @@ static __always_inline int __folio_try_dup_anon_rmap(struct folio *folio, > atomic_add(orig_nr_pages, &folio->_large_mapcount); > break; > case RMAP_LEVEL_PMD: > + case RMAP_LEVEL_PUD: > if (PageAnonExclusive(page)) { > if (unlikely(maybe_pinned)) > return -EBUSY; > diff --git a/mm/rmap.c b/mm/rmap.c > index c6c4d4e..39d0439 100644 > --- a/mm/rmap.c > +++ b/mm/rmap.c > @@ -1203,6 +1203,11 @@ static __always_inline unsigned int __folio_add_rmap(struct folio *folio, > } > atomic_inc(&folio->_large_mapcount); > break; > + case RMAP_LEVEL_PUD: > + /* We only support entire mappings of PUD sized folios in rmap */ > + atomic_inc(&folio->_entire_mapcount); > + atomic_inc(&folio->_large_mapcount); > + break; This way you don't account the pages at all as mapped, whereby PTE-mapping it would? And IIRC, these PUD-sized pages can be either mapped using PTEs or using a single PUD. I suspect what you want is to diff --git a/mm/rmap.c b/mm/rmap.c index c6c4d4ea29a7e..1477028d3a176 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1187,12 +1187,19 @@ static __always_inline unsigned int __folio_add_rmap(struct folio *folio, atomic_add(orig_nr_pages, &folio->_large_mapcount); break; case RMAP_LEVEL_PMD: + case RMAP_LEVEL_PUD: first = atomic_inc_and_test(&folio->_entire_mapcount); if (first) { nr = atomic_add_return_relaxed(ENTIRELY_MAPPED, mapped); if (likely(nr < ENTIRELY_MAPPED + ENTIRELY_MAPPED)) { - *nr_pmdmapped = folio_nr_pages(folio); - nr = *nr_pmdmapped - (nr & FOLIO_PAGES_MAPPED); + nr_pages = folio_nr_pages(folio); + /* + * We only track PMD mappings of PMD-sized + * folios separately. + */ + if (level == RMAP_LEVEL_PMD) + *nr_pmdmapped = nr_pages; + nr = nr_pages - (nr & FOLIO_PAGES_MAPPED); /* Raced ahead of a remove and another add? */ if (unlikely(nr < 0)) nr = 0; Similar on the removal path. -- Cheers, David / dhildenb