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b=LmCitdoMcHqTnvQU+INOApLZaqDy4HXuWxSaIqLXfAqbitAIu1fyUb+4JkelvePJa KZFLAceFbpytteLKErnKIwYMITurgWszw+f5PJ4iz9mhgjBv7ZW5vU82jHmkhNR62k L683nSexvZo6jWxdemjVfqrSQaxglYWSJ6J4tYiMjPrLOpcOOw3XarTASdem1c/adq LFCmvwdifqj585wxkch3ebML/B67qao4kRTUNnLbi7CMxZOz/CbY72Y2kWcSDwq+FT xqVc3znHEkN9To4K0GkysibGcLFPCk9B//rnyQamhHo/5to4z7lOu+6IyHgZJFiQzx 8F+c+l0gARg5A== Message-ID: Date: Thu, 12 Mar 2026 13:46:19 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 05/13] selftests/mm: size tmpfs according to PMD page size in split_huge_page_test To: Sayali Patil , Andrew Morton , Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Ritesh Harjani Cc: Zi Yan , Michal Hocko , Oscar Salvador , Lorenzo Stoakes , Dev Jain , Liam.Howlett@oracle.com, linuxppc-dev@lists.ozlabs.org References: <94c18dd26cf88f10b4b496cb3de08d81439a8909.1773305677.git.sayalip@linux.ibm.com> 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-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 54A35160007 X-Stat-Signature: k4ofoftn6ztgzidcfdqrfjethtt3dfn6 X-Rspam-User: X-HE-Tag: 1773319585-719334 X-HE-Meta: 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 jg44j3AV 8QL+1D0AxBZ9ehQLwssNflbUAuuYMFKA50uEbb7xl3bT4iA+fofglKVcuH6PYsH3ViABBvKKGNhCRwPjWUq8F63wlGzLo+14RiJ2A4xpbYCKBSvqlKVfzjUCRVajbdLdyhZ+5Cw3xk76p1jbcCWgRnWq2gqGtp62cmHsZEMF1ndsyWzEfGWk/Gw9PLmdb4sZkasKZs0sQzmjp7tylmBbTi2TFcPdg2tbW390kJt/sLyblvlBTcSEBd9wqXdvHgUPDg0FhiI8mJOEprzI7yR9G0gsNDRxcTbkJO9cPfrHSduKXCGfwWzoPBjmuToHIJZjPyn7UAALJcV+VKkf03aKxzJoQ5yjKwSK3BSP7KmN8CRImefQPrIrpXCQmQaDoXb8BrzOtJg92D9NqqCDjhXf7/6zHkoZLeD7ONjiMk4o8/tF5t73uVYrIjI0ilLSvVR/aLhjq Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/12/26 13:25, Sayali Patil wrote: > The split_file_backed_thp() test mounts a tmpfs with a fixed size of > "4m". This works on systems with smaller PMD page sizes, > but fails on configurations where the PMD huge page size is > larger (e.g. 16MB). > > On such systems, the fixed 4MB tmpfs is insufficient to allocate even > a single PMD-sized THP, causing the test to fail. > > Fix this by sizing the tmpfs dynamically based on the runtime > pmd_pagesize, allocating space for two PMD-sized pages. > > Before patch: > running ./split_huge_page_test /tmp/xfs_dir_YTrI5E > -------------------------------------------------- > TAP version 13 > 1..55 > ok 1 Split zero filled huge pages successful > ok 2 Split huge pages to order 0 successful > ok 3 Split huge pages to order 2 successful > ok 4 Split huge pages to order 3 successful > ok 5 Split huge pages to order 4 successful > ok 6 Split huge pages to order 5 successful > ok 7 Split huge pages to order 6 successful > ok 8 Split huge pages to order 7 successful > ok 9 Split PTE-mapped huge pages successful > Please enable pr_debug in split_huge_pages_in_file() for more info. > Failed to write data to testing file: Success (0) > Bail out! Error occurred > Planned tests != run tests (55 != 9) > Totals: pass:9 fail:0 xfail:0 xpass:0 skip:0 error:0 > [FAIL] > > After patch: > -------------------------------------------------- > running ./split_huge_page_test /tmp/xfs_dir_bMvj6o > -------------------------------------------------- > TAP version 13 > 1..55 > ok 1 Split zero filled huge pages successful > ok 2 Split huge pages to order 0 successful > ok 3 Split huge pages to order 2 successful > ok 4 Split huge pages to order 3 successful > ok 5 Split huge pages to order 4 successful > ok 6 Split huge pages to order 5 successful > ok 7 Split huge pages to order 6 successful > ok 8 Split huge pages to order 7 successful > ok 9 Split PTE-mapped huge pages successful > Please enable pr_debug in split_huge_pages_in_file() for more info. > Please check dmesg for more information > ok 10 File-backed THP split to order 0 test done > Please enable pr_debug in split_huge_pages_in_file() for more info. > Please check dmesg for more information > ok 11 File-backed THP split to order 1 test done > Please enable pr_debug in split_huge_pages_in_file() for more info. > Please check dmesg for more information > ok 12 File-backed THP split to order 2 test done > ... > ok 55 Split PMD-mapped pagecache folio to order 7 at > in-folio offset 128 passed > Totals: pass:55 fail:0 xfail:0 xpass:0 skip:0 error:0 > [PASS] > ok 1 split_huge_page_test /tmp/xfs_dir_bMvj6o > > Fixes: fbe37501b252 ("mm: huge_memory: debugfs for file-backed THP split") > Reviewed-by: Zi Yan > Signed-off-by: Sayali Patil > --- Reviewed-by: David Hildenbrand (Arm) -- Cheers, David