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[2003:d8:2f27:6d00:7b96:afc9:83d0:5bd]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-46137a252fasm23338645e9.7.2025.09.17.00.02.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 17 Sep 2025 00:02:58 -0700 (PDT) Message-ID: <8c3188da-7078-4099-973a-1d0d74db2720@redhat.com> Date: Wed, 17 Sep 2025 09:02:55 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] mm/memory-failure: Support disabling soft offline for HugeTLB pages To: Anshuman Khandual , Kyle Meyer , akpm@linux-foundation.org, corbet@lwn.net, linmiaohe@huawei.com, shuah@kernel.org, tony.luck@intel.com, jane.chu@oracle.com, jiaqiyan@google.com Cc: Liam.Howlett@oracle.com, bp@alien8.de, hannes@cmpxchg.org, jack@suse.cz, 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-Stat-Signature: e8brrkybsunjywjmmmzxiu1zcaa8ez5b X-Rspam-User: X-Rspamd-Queue-Id: 8DE728000D X-Rspamd-Server: rspam04 X-HE-Tag: 1758092582-697975 X-HE-Meta: U2FsdGVkX1/YgTdnWJ3qyEyO6NRPTJmG3tflCUoc+BV/zm8H8u0+EzT3LsxCiLf47k4HFJSlnx9NllYB6qzN/mpm3JE8Q31vRFi6qKzO5hy844vedLFxt6Vd5QKBK2XEfB95+QuxtGWERzDBktTC0n2fRHWf9owllAIzIpIJvvWeCfuaKE+/7kA4fHtJCvJZf6ZhTd18dl3xV1kt3+k8dgAqCUEk+OEGh1SO1Yrg4C9RBAbDnsGGW13vzB7gJJNEJfgwmCZ/1PkD1esRD5e+1msmVMz+mYfri62VXU9k2g2KB9e3NQ3ytDp6o8cwsQz3d6E996JsC5exeas/B3EBtH0LlE01DVJquaaFZLau8caz5Vz5TAj+f/VG5jP9p2JJV/u5kxE+9JU83S1KWE+sHkHrouisrlNFbXbGsdg7XZ8fW21dRYgoby5o9lFjdzjTOOAApTcoeaehGfwEybYMvJsE3RGGxFvqKT0sq0ZYnZXU+s9dVy93b+RMist/AGXgOt5vwuuLKv9Et17pHXHQOb6X00VZEwdZLD/aVyVolaDSYzVLQU3PaG/IVCxx0PrYUMRVPJRJ6GOdKlM0gobppQHyfSXjSvggowZz7PVFafEaoa0GGuiYSwJ6zbRJeXZhVERIlncjmqdjL7nuiaM5ST+25ULXC8iVhjO5+xv4da+dRX5HAU7EbcA9rlbzo9Xd10Ij2zgVcGj6RnK2/QllOpxrwPjlnOtrNE4TirmJm2zqjLPKqXeMyPDaATOX2vkci6UDPg3JteuBr7fCoaPPpe9+YcWBzCUPRI1UZwmA7/7xD45aTo5T/qnCGYWZSMvVq6UA0mvPAAK/QNUynFcNXnFMaJbyIveM3eSIQ5FKay8vvW4BgGSbYXExr+vGi/OJFlGDHL1tCNFXlU3w8bsQCX8GdttBm/KuBtmSyrlk+I0YJpu3U3ER1DnxHDBukRgaTIlKl1ApovqtFvHAShB WC0K2S8C 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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: >> + >> + 0 - Enable soft offline >> + 1 - Disable soft offline for HugeTLB pages >> + >> +Supported values:: >> + >> + 0 - Soft offline is disabled >> + 1 - Soft offline is enabled >> + 3 - Soft offline is enabled (disabled for HugeTLB pages) > > This looks very adhoc even though existing behavior is preserved. > > - Are HugeTLB pages the only page types to be considered ? > - How the remaining bits here are going to be used later ? > What I proposed (that could be better documented here) is that all other bits except the first one will be a disable mask when bit 0 is set. 2 - ... but yet disabled for hugetlb 4 - ... but yet disabled for $WHATEVER 8 - ... but yet disabled for $WHATEVERELSE > Also without a bit-wise usage roadmap, is not changing a procfs > interface (ABI) bit problematic ? For now we failed setting it to values that are neither 0 or 1, IIUC set_enable_soft_offline() correctly? So there should not be any problem, or which scenario do you have in mind? -- Cheers David / dhildenb