-----Original Message----- > On 09/11/2020 04:53 PM, HAGIO KAZUHITO(萩尾 一仁) wrote: > > Hi Pingfan, > > > > -----Original Message----- > >> Hello, > >> > >> There is an appeal which only wants to save some user page including env > >> and args pages, and discards the other user space pages. > > > > I understand that it's helpful to get them even with -d 31 for crash's > > "ps -a" option.. > > > >> > >> To achieve this feature, mm_struct's members "arg_start, arg_end, > >> env_start, env_end;" should be accessed. So we need to export mm_struct > >> and init_mm through vmcore. > > > > How many offsets/sizes will be required to walk all tasks? > At present, I think only the info "arg_start, arg_end, env_start, > env_end" in mm_struct are required. ah what I wanted to ask mainly was the number of the offsets/sizes used to walk through all (user) tasks in a system, because makedumpfile cannot get to a task's arg_start only with OFFSET(mm_struct.arg_start). Is it easy enough to do it only with several vmcoreinfo entries? Thanks, Kazu > > If kernel maintainers accept it, I will not oppose that feature.. > OK, I will start with kernel side as the first step. > > > > (or it would be simpler to mark the pages something special when allocating, > > but I don't feel like it's easy to change kernel to do so.) > Yes, I agree. From kernel side, the page is a normal user space page, > there should not be exception. > > Thanks, > Pingfan _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
