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[2003:d8:2f42:b000:db8b:7655:f60f:812b]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3e760786ceasm1624111f8f.16.2025.09.11.01.46.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 11 Sep 2025 01:46:12 -0700 (PDT) Message-ID: <749511a8-7c57-4f97-9e49-8ebe8befe9aa@redhat.com> Date: Thu, 11 Sep 2025 10:46:10 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/memory-failure: Disable soft offline for HugeTLB pages by default To: Kyle Meyer , akpm@linux-foundation.org, corbet@lwn.net, linmiaohe@huawei.com, shuah@kernel.org, tony.luck@intel.com Cc: Liam.Howlett@oracle.com, bp@alien8.de, hannes@cmpxchg.org, jack@suse.cz, jane.chu@oracle.com, jiaqiyan@google.com, joel.granados@kernel.org, laoar.shao@gmail.com, lorenzo.stoakes@oracle.com, mclapinski@google.com, mhocko@suse.com, nao.horiguchi@gmail.com, osalvador@suse.de, rafael.j.wysocki@intel.com, rppt@kernel.org, russ.anderson@hpe.com, shawn.fan@intel.com, surenb@google.com, vbabka@suse.cz, linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org References: From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 916DC14000B X-Stat-Signature: yt6m36whzqsxwypamnaes9xwqso7j77e X-HE-Tag: 1757580376-206099 X-HE-Meta: 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 ZYFK+eOe 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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 10.09.25 18:15, Kyle Meyer wrote: > Soft offlining a HugeTLB page reduces the available HugeTLB page pool. > Since HugeTLB pages are preallocated, reducing the available HugeTLB > page pool can cause allocation failures. > > /proc/sys/vm/enable_soft_offline provides a sysctl interface to > disable/enable soft offline: > > 0 - Soft offline is disabled. > 1 - Soft offline is enabled. > > The current sysctl interface does not distinguish between HugeTLB pages > and other page types. > > Disable soft offline for HugeTLB pages by default (1) and extend the > sysctl interface to preserve existing behavior (2): > > 0 - Soft offline is disabled. > 1 - Soft offline is enabled (excluding HugeTLB pages). > 2 - Soft offline is enabled (including HugeTLB pages). > > Update documentation for the sysctl interface, reference the sysctl > interface in the sysfs ABI documentation, and update HugeTLB soft > offline selftests. I'm sure you spotted that the documentation for "/sys/devices/system/memory/soft_offline_pag" resides under "testing". If your read about MADV_SOFT_OFFLINE in the man page it clearly says: "This feature is intended for testing of memory error-handling code; it is available only if the kernel was configured with CONFIG_MEMORY_FAILURE." So I'm sorry to say: I miss why we should add all this complexity to make a feature used for testing soft-offlining work differently for hugetlb folios -- with a testing interface. -- Cheers David / dhildenb