Hello
Thank you for your reply.
Is there no way to get a valid checkpoint in a simulation with caches enabled?
Is there nothing that I can do (hack)?
Alexandru
________________________________
From: Ali Saidi <[email protected]>
To: Iordan Alexandru <[email protected]>; gem5 users mailing list
<[email protected]>
Sent: Tuesday, August 9, 2011 9:31 PM
Subject: Re: [gem5-users] About checkpointing
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 <[email protected]>
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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