Hi, On Tue Mar 06, 2018 at 10:22:18 +0800, Zeyu Mi wrote: > On Tue, Mar 6, 2018 at 9:20 AM, Zeyu Mi <yzmiz...@gmail.com> wrote: > > > > > > > On Tue, Mar 6, 2018 at 7:50 AM, Adam Lackorzynski < > > a...@os.inf.tu-dresden.de> wrote: > > > >> Hi, > >> > > Hi Adam, > > > >> > >> On Mon Mar 05, 2018 at 19:47:19 +0800, Zeyu Mi wrote: > >> > I am studying the implementation of the Fiasco.OC and the L4Linux. > >> > > >> > I have searched on the Internet and many papers and documents record > >> that > >> > L4Linux runs as an L4 server and > >> > any L4Linux user process is a new task, which has a new page table > >> > different from that of an L4Linux server. > >> > > >> > However, the experiment result seems to conflict with those documents. > >> When > >> > I started a new program in the > >> > L4Linux shell and used "lp" command (show present list) in JDB, I > >> noticed > >> > that there was one thread having "vcpu" state. > >> > But the resulted list did not contain any new thread or task which is > >> > related to the new program. > >> > > >> > I am very confused and wondering whether or not the implementation > >> recorded > >> > in those papers or documents are wrong or obsolete? > >> > >> Your obvservations are all right, however, 'lp' lists all threads in the > >> system but not tasks (aka address spaces). For listing tasks, use 's', > >> where you will see all the tasks for the Linux user processes. > >> > > I have tried 's' command, but there was alwasy a general protection fault. > > The following is the error > > message. > > > > KERNEL: Warning: No page-fault handler for 0xfffffffff0400008, error 0x0, > > pc fffffffff000922b > > General Protection (eip=fffffffff0042dc3, err=0000000000000000) -- jdb bug?
Strange. You might want to update your snapshot version although I cannot remember having seen such an error. Alternatively use shift-Q and look for tasks. > > There has been a change in model for L4Linux. With the vcpu model there > >> is only one thread (the vcpu) which is moving between the tasks for > >> execution. In the previous thread mode there has been a thread in each > >> user process. Both variants are still available through the L4Linux > >> config. > >> > > Could you kindly tell me how to enable the previous thread mode? > > > > Hi Adam, > I have disabled the vcpu exeuction mode by changing the L4Linux config. > But there is one warning treated as an error when compiling the L4Linux. > Following is the detailed error log: > > src/l4linux/arch/l4/kernel/main.c:3853:2: error: implicit declaration of > function ‘get_cpu_gdt_table’ [-Werror=implicit-function-declaration] > l4x_load_percpu_gdt_descriptor(get_cpu_gdt_table(_cpu)); > > Do you have any suggestion to fix that? Disable CONFIG_SMP? Adam _______________________________________________ l4-hackers mailing list email@example.com http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers