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[84.136.37.227]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3663ada00e7sm13679617f8f.112.2024.06.25.11.43.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Jun 2024 11:43:12 -0700 (PDT) Message-ID: Date: Tue, 25 Jun 2024 20:43:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/4] mm/filemap: Make MAX_PAGECACHE_ORDER acceptable to xarray To: Gavin Shan , linux-mm@kvack.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, djwong@kernel.org, willy@infradead.org, akpm@linux-foundation.org, hughd@google.com, torvalds@linux-foundation.org, zhenyzha@redhat.com, shan.gavin@gmail.com References: <20240625090646.1194644-1-gshan@redhat.com> <20240625090646.1194644-2-gshan@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20240625090646.1194644-2-gshan@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 1243620011 X-Stat-Signature: 8pnht6arfskt6ofa48fo1trz87ix6xy7 X-HE-Tag: 1719340997-163463 X-HE-Meta: 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 wVRWLQ12 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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 25.06.24 11:06, Gavin Shan wrote: > The largest page cache order can be HPAGE_PMD_ORDER (13) on ARM64 > with 64KB base page size. The xarray entry with this order can't > be split as the following error messages indicate. > > ------------[ cut here ]------------ > WARNING: CPU: 35 PID: 7484 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128 > Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib \ > nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct \ > nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 \ > ip_set rfkill nf_tables nfnetlink vfat fat virtio_balloon drm \ > fuse xfs libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64 \ > sha1_ce virtio_net net_failover virtio_console virtio_blk failover \ > dimlib virtio_mmio > CPU: 35 PID: 7484 Comm: test Kdump: loaded Tainted: G W 6.10.0-rc5-gavin+ #9 > Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024 > pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) > pc : xas_split_alloc+0xf8/0x128 > lr : split_huge_page_to_list_to_order+0x1c4/0x720 > sp : ffff800087a4f6c0 > x29: ffff800087a4f6c0 x28: ffff800087a4f720 x27: 000000001fffffff > x26: 0000000000000c40 x25: 000000000000000d x24: ffff00010625b858 > x23: ffff800087a4f720 x22: ffffffdfc0780000 x21: 0000000000000000 > x20: 0000000000000000 x19: ffffffdfc0780000 x18: 000000001ff40000 > x17: 00000000ffffffff x16: 0000018000000000 x15: 51ec004000000000 > x14: 0000e00000000000 x13: 0000000000002000 x12: 0000000000000020 > x11: 51ec000000000000 x10: 51ece1c0ffff8000 x9 : ffffbeb961a44d28 > x8 : 0000000000000003 x7 : ffffffdfc0456420 x6 : ffff0000e1aa6eb8 > x5 : 20bf08b4fe778fca x4 : ffffffdfc0456420 x3 : 0000000000000c40 > x2 : 000000000000000d x1 : 000000000000000c x0 : 0000000000000000 > Call trace: > xas_split_alloc+0xf8/0x128 > split_huge_page_to_list_to_order+0x1c4/0x720 > truncate_inode_partial_folio+0xdc/0x160 > truncate_inode_pages_range+0x1b4/0x4a8 > truncate_pagecache_range+0x84/0xa0 > xfs_flush_unmap_range+0x70/0x90 [xfs] > xfs_file_fallocate+0xfc/0x4d8 [xfs] > vfs_fallocate+0x124/0x2e8 > ksys_fallocate+0x4c/0xa0 > __arm64_sys_fallocate+0x24/0x38 > invoke_syscall.constprop.0+0x7c/0xd8 > do_el0_svc+0xb4/0xd0 > el0_svc+0x44/0x1d8 > el0t_64_sync_handler+0x134/0x150 > el0t_64_sync+0x17c/0x180 > > Fix it by decreasing MAX_PAGECACHE_ORDER to the largest supported order > by xarray. For this specific case, MAX_PAGECACHE_ORDER is dropped from > 13 to 11 when CONFIG_BASE_SMALL is disabled. > > Fixes: 4f6617011910 ("filemap: Allow __filemap_get_folio to allocate large folios") > Cc: stable@kernel.org # v6.6+ > Suggested-by: David Hildenbrand > Signed-off-by: Gavin Shan > --- > include/linux/pagemap.h | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) > > diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h > index 59f1df0cde5a..a0a026d2d244 100644 > --- a/include/linux/pagemap.h > +++ b/include/linux/pagemap.h > @@ -354,11 +354,18 @@ static inline void mapping_set_gfp_mask(struct address_space *m, gfp_t mask) > * a good order (that's 1MB if you're using 4kB pages) > */ > #ifdef CONFIG_TRANSPARENT_HUGEPAGE > -#define MAX_PAGECACHE_ORDER HPAGE_PMD_ORDER > +#define PREFERRED_MAX_PAGECACHE_ORDER HPAGE_PMD_ORDER > #else > -#define MAX_PAGECACHE_ORDER 8 > +#define PREFERRED_MAX_PAGECACHE_ORDER 8 > #endif > > +/* > + * xas_split_alloc() does not support arbitrary orders. This implies no > + * 512MB THP on ARM64 with 64KB base page size. > + */ > +#define MAX_XAS_ORDER (XA_CHUNK_SHIFT * 2 - 1) > +#define MAX_PAGECACHE_ORDER min(MAX_XAS_ORDER, PREFERRED_MAX_PAGECACHE_ORDER) > + > /** > * mapping_set_large_folios() - Indicate the file supports large folios. > * @mapping: The file. Thanks! Acked-by: David Hildenbrand -- Cheers, David / dhildenb