You can't checkpoint the simulation with caches enabled. Any dirty state in the caches isn't saved in the checkpoint.
Ali On Tue, 9 Aug 2011 03:29:47 -0700 (PDT), Iordan Alexandru wrote: Hello I have been having problems using the checkpoint feature in GEM5. I tried to run a very simple scenario: 1. I launched the simulator with the command: ./build/ALPHA_FS/gem5.opt --outdir=test/ configs/example/fs.py -n 2 --caches --l2cache 2. using m5term I created a checkpoint (witch was created with no errors) and then I exited the simulation 3. I tried to restore using the checkpoint: ./build/ALPHA_FS/gem5.opt --outdir=test/ configs/example/fs.py -n 2 --caches --l2cache -r 1 The message that I got in m5term is the following: ==== m5 slave terminal: Terminal 0 ==== Unable to handle kernel paging request at virtual address 000000011fd2dd40 Fixing recursive fault but reboot is needed! Unable to handle kernel paging request at virtual address 0000000000000004 CPU 0 mount(761): Oops 0 pc = [] ra = [] ps = 0000 Not tainted pc is at do_exit+0xf4/0x950 ra is at do_exit+0x80/0x950 v0 = 0000000000000007 t0 = 0000000000000004 t1 = fffffc001f4a96d0 t2 = fffffc000085eca0 t3 = 0000000000000000 t4 = fffffc00008191c0 t5 = 0000000000000ad7 t6 = 0000000000000031 t7 = fffffc001f354000 s0 = 0000000000000009 s1 = fffffc001f4a9500 s2 = 0000000000000000 s3 = 0000000000000000 s4 = 0000000000000000 s5 = 000000011fd2dd40 s6 = 0000000000000000 a0 = fffffc001f4a9500 a1 = fffffc000083c108 a2 = ffffffffffffffff a3 = 0000000000000000 a4 = 0000000000000008 a5 = 0000000000000009 t8 = 0000000000000000 t9 = fffffc00006c9534 t10= 0000000000007fff t11= 00000000000003ff pv = fffffc000034f030 at = 0000000000000000 gp = fffffc000085bf40 sp = fffffc001f357da0 Trace: [] do_page_fault+0x3c0/0x4a0 [] do_page_fault+0x3ac/0x4a0 [] entMM+0x9c/0xc0 [] do_group_exit+0x54/0x100 Code: 402203a1 e4200001 b44400b0 a42a0358 20210004 60004000 40603122 Fixing recursive fault but reboot is needed! Unable to handle kernel paging request at virtual address 0000000000000004 CPU 0 mount(761): Oops 0 pc = [] ra = [] ps = 0000 Tainted: G D pc is at do_exit+0xf4/0x950 ra is at do_exit+0x80/0x950 v0 = 0000000000000007 t0 = 0000000000000004 t1 = fffffc001f4a96d0 t2 = fffffc000085eca0 t3 = 0000000000000000 t4 = fffffc00008191c0 t5 = 0000000000000fed t6 = 0000000000000031 t7 = fffffc001f354000 s0 = 000000000000000b s1 = fffffc001f4a9500 s2 = 0000000000000000 s3 = fffffc001f357c38 s4 = 0000000000000000 s5 = 0000000000000004 s6 = 0000000000000000 a0 = fffffc001f4a9500 a1 = fffffc000083c108 a2 = ffffffffffffffff a3 = 0000000000000000 a4 = 0000000000000008 a5 = 0000000000000008 t8 = 0000000000000000 t9 = fffffc00006c9534 t10= 0000000000007fff t11= 00000000000003ff pv = fffffc000034f030 at = 0000000000000000 gp = fffffc000085bf40 sp = fffffc001f357b10 Trace: [] die_if_kernel+0x12c/0x130 [] die_if_kernel+0xd4/0x130 [] do_page_fault+0x3ac/0x4a0 [] entMM+0x9c/0xc0 [] release_console_sem+0x20c/0x310 [] release_console_sem+0x2b4/0x310 [] vprintk+0x224/0x530 [] vprintk+0x224/0x530 [] do_exit+0x80/0x950 [] exit_signals+0x0/0x190 [] do_exit+0xf4/0x950 [] do_page_fault+0x3c0/0x4a0 [] do_page_fault+0x3ac/0x4a0 [] entMM+0x9c/0xc0 [] do_group_exit+0x54/0x100 Code: 402203a1 e4200001 b44400b0 a42a0358 20210004 60004000 40603122 Did I did something wrong here? Do I need to add something in the configuration file before I can use the checkpoint feature? Thank you in advance! Alexandru die_if_kernel recursion detected.
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