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[2003:d8:2f0e:2c00:d6bb:8859:fbbc:b8a9]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4589edf56e0sm169284285e9.1.2025.08.04.05.49.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 04 Aug 2025 05:49:54 -0700 (PDT) Message-ID: <77d17dbf-1609-41b1-9244-488d2ce75b33@redhat.com> Date: Mon, 4 Aug 2025 14:49:53 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC][PATCH v2 22/29] mm/numa: Register information into Kmemdump To: Eugen Hristev , Michal Hocko Cc: 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> <23e7ec80-622e-4d33-a766-312c1213e56b@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 1791040006 X-Stat-Signature: 8ib3n9bw3xgcjjsowufy673e7n59nr66 X-Rspam-User: X-HE-Tag: 1754311798-869270 X-HE-Meta: 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 xZo5NGDS Asa+Zpce64lIpPAfsn+ygCddACGdYFjrAACrl1/hhn5NdkflWee6Odam+YPe2vN10107nXuT4Nw70cTMx4VO1cY+awddxqTUAjio9GG/ln94dkQVJ+y9p6Qpa9lmZ7ZGu+z7o1yxTic61dIdK/2dZhDijwRj/1O/EL9ARRX5isq2kZpFlvmMR2/sYBIN7P1AixQjBfI0LIIayWqyvMk9jy6SJ0tMVKs4K7jKMCfJXjcObRXKH+YN2jSMPsSXqXuBaQAD7RX7ToWwDg8A0adIFNMO1aXV09PguU5YNa1TSwfMqMzUBLySct73EJw2ROhJP6z/FnLc6bhS/EFzaVGLFQ+gMp6/I+Qd/Re2LG6h8atnZp2glQmjPxhCm3BxOxRRZQKEmhmaJ+7v8lhudCQdyyCZ3jlsWLgqo/qlMaLh7y+cS9mM5g4Uc6oPgOwSzK5nRGM3U6uMErtqr64M= 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 14:29, Eugen Hristev wrote: > > > On 8/4/25 15:18, David Hildenbrand wrote: >> On 04.08.25 13:06, Eugen Hristev wrote: >>> >>> >>> On 8/4/25 13:54, 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? >>> >>> Some static symbols are indeed part of kallsyms. But some symbols are >>> not exported, for example patch 20/29, where printk related symbols are >>> not to be exported. Another example is with static variables, like in >>> patch 17/29 , not exported as symbols, but required for the dump. >>> Dynamic memory regions are not have to also be considered, have a look >>> for example at patch 23/29 , where dynamically allocated memory needs to >>> be registered. >>> >>> Do you think that I should move all kallsyms related symbols annotation >>> into a separate place and keep it for the static/dynamic regions in place ? >> >> If you want to use a symbol from kmemdump, then make that symbol >> available to kmemdump. > > That's what I am doing, registering symbols with kmemdump. > Maybe I do not understand what you mean, do you have any suggestion for > the static variables case (symbols not exported) ? Let's use patch #20 as example: What I am thinking is that you would not include "linux/kmemdump.h" and not leak all of that KMEMDUMP_ stuff in all these files/subsystems that couldn't less about kmemdump. Instead of doing static struct printk_ringbuffer printk_rb_dynamic; You'd do struct printk_ringbuffer printk_rb_dynamic; and have it in some header file, from where kmemdump could lookup the address. So you move the logic of what goes into a dump from the subsystems to the kmemdump core. -- Cheers, David / dhildenb