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[2003:d8:2f0e:2c00:d6bb:8859:fbbc:b8a9]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4589edfd983sm166628015e9.13.2025.08.04.05.16.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 04 Aug 2025 05:16:42 -0700 (PDT) Message-ID: Date: Mon, 4 Aug 2025 14:16:41 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC][PATCH v2 22/29] mm/numa: Register information into Kmemdump To: Michal Hocko Cc: Eugen Hristev , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, tglx@linutronix.de, andersson@kernel.org, pmladek@suse.com, linux-arm-kernel@lists.infradead.org, linux-hardening@vger.kernel.org, corbet@lwn.net, mojha@qti.qualcomm.com, rostedt@goodmis.org, jonechou@google.com, tudor.ambarus@linaro.org References: <20250724135512.518487-1-eugen.hristev@linaro.org> <20250724135512.518487-23-eugen.hristev@linaro.org> <751514db-9e03-4cf3-bd3e-124b201bdb94@redhat.com> 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-Queue-Id: 30B0F40003 X-Rspamd-Server: rspam06 X-Stat-Signature: 87yia1tk7mscg9xbmykpms98wo1g47x8 X-HE-Tag: 1754309807-33745 X-HE-Meta: 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 pLpM4Tck Obz+Jw72ridbIyiyoDjjfo2g1zQSVt8zBLCQ/9dThmO+5CowS/ZkzKYkTee7wqrwKoIE4s6brpfAbwCnh+BCbWBao5mst0v2LX7kfNK5AfGLFvf8sBlQctK6CMQOnE/kBnoACywLj7lGjlMfZ7Da8JSVB+IjPRVnYHmTYz3QkZvwo2PdheY0CXisk+84QJ9S83I+3IGr28rCLJygQr2vF3r8uLwkOOTD3GO6J/rer/Nl87+dzh9j1FKlH231uolIZqSbU2fehdvvJ8cdFrQE3+X7qT/Fza+n17ibQ4WYU4PjkK5DH2CYG9UIjmdoCSB0WJkcZyJio5Eo9HVr5bQDoSLt3FsZFVVPLy6VAWyEOe7b0NtFc4R5/oYguSf3laNs1Jmy5rv9+KRPrphzKALMrvdQSL5yyO0xSf76wxdhyC1YsDDVxdl37TF7W/0oBy1GZ4Q7GYXfwxvs4G/PqOYME0mw1q9l/I4P63r+lT7mugaIhNqk= 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 04.08.25 12:54, Michal Hocko wrote: > On Wed 30-07-25 16:04:28, David Hildenbrand wrote: >> On 30.07.25 15:57, Eugen Hristev wrote: > [...] >>> Yes, registering after is also an option. Initially this is how I >>> designed the kmemdump API, I also had in mind to add a flag, but, after >>> discussing with Thomas Gleixner, he came up with the macro wrapper idea >>> here: >>> https://lore.kernel.org/lkml/87ikkzpcup.ffs@tglx/ >>> Do you think we can continue that discussion , or maybe start it here ? >> >> Yeah, I don't like that, but I can see how we ended up here. >> >> I also don't quite like the idea that we must encode here what to include in >> a dump and what not ... >> >> For the vmcore we construct it at runtime in crash_save_vmcoreinfo_init(), >> where we e.g., have >> >> VMCOREINFO_STRUCT_SIZE(pglist_data); >> >> Could we similar have some place where we construct what to dump similarly, >> just not using the current values, but the memory ranges? > > All those symbols are part of kallsyms, right? Can we just use kallsyms > infrastructure and a list of symbols to get what we need from there? > > In other words the list of symbols to be completely external to the code > that is defining them? That was the idea. All we should need is the start+size of the ranges. No need to have these kmemdump specifics all over the kernel. -- Cheers, David / dhildenb