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15.20.6178.026; Fri, 17 Mar 2023 07:30:25 +0000 From: "lizhijian@fujitsu.com" To: Dan Williams , "kexec@lists.infradead.org" , "nvdimm@lists.linux.dev" , "linux-mm@kvack.org" CC: Baoquan He , "vgoyal@redhat.com" , "dyoung@redhat.com" , "vishal.l.verma@intel.com" , "dave.jiang@intel.com" , "horms@verge.net.au" , "k-hagio-ab@nec.com" , "akpm@linux-foundation.org" , "Yasunori Gotou (Fujitsu)" , "yangx.jy@fujitsu.com" , "ruansy.fnst@fujitsu.com" Subject: Re: [RFC][nvdimm][crash] pmem memmap dump support Thread-Topic: [RFC][nvdimm][crash] pmem memmap dump support Thread-Index: AQHZR0+Bi1lA/ErA5EK0zxLjybbH0K7+oGsAgAAVogA= Date: Fri, 17 Mar 2023 07:30:25 +0000 Message-ID: <03bf236a-e832-ab81-2b2d-448aea37a2e4@fujitsu.com> References: <3c752fc2-b6a0-2975-ffec-dba3edcf4155@fujitsu.com> <641404ea806dc_a52e2949@dwillia2-mobl3.amr.corp.intel.com.notmuch> In-Reply-To: <641404ea806dc_a52e2949@dwillia2-mobl3.amr.corp.intel.com.notmuch> Accept-Language: en-US, zh-CN Content-Language: en-US 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nvK/vy4OAY1XQSus7Yd649Tj76/wzJMNhtURB9Zhn83OPMQVHgPbVVKOXtf33sDnBlpp8AR0f/VayHG62X1Qyg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TY3PR01MB10416 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230317_003040_227509_93650A36 X-CRM114-Status: GOOD ( 15.26 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On 17/03/2023 14:12, Dan Williams wrote: > lizhijian@fujitsu.com wrote: > [..] >> Case D: unsupported && need your input To support this situation, the >> makedumpfile needs to know the location of metadata for each pmem >> namespace and the address and size of metadata in the pmem [start, >> end) > > My first reaction is that you should copy what the ndctl utility does > when it needs to manipulate or interrogate the metadata space. > > For example, see namespace_rw_infoblock():> > https://github.com/pmem/ndctl/blob/main/ndctl/namespace.c#L2022 > > That facility uses the force_raw attribute > ("/sys/bus/nd/devices/namespaceX.Y/force_raw") to arrange for the > namespace to initalize without considering any pre-existing metdata > *and* without overwriting it. In that mode makedumpfile can walk the > namespaces and retrieve the metadata written by the previous kernel. For the dumping application(makedumpfile or cp), it will/should reads /proc/vmcore to construct the dumpfile, So makedumpfile need to know the *address* and *size/end* of metadata in the view of 1st kernel address space. I haven't known much about namespace_rw_infoblock() , so it is also an option if we can know such information from it. My current WIP propose is to export a list linking all pmem namespaces to vmcore, with this, the kdump kernel don't need to rely on the pmem driver. Thanks Zhijian > > The module to block to allow makedumpfile to access the namespace in raw > mode is the nd_pmem module, or if it is builtin the > nd_pmem_driver_init() initcall. _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec