Hi Richard,
I haven't tried it, but my first guess would be that the process is getting
initialized (code & data loaded, stack set up, etc.) and then the checkpoint
is coming in and trying to overwrite all that. This isn't necessarily an
error, it's just that the PageTable code isn't prepared for that. Note that
the PageTable class is only used for SE mode (not for FS), so getting an
error there is a pretty good sign that no one has done SE-mode checkpoints
before. If you like living on the edge, you could just disable that error
and see what happens... in the long run it would probably be best to have
some way to suppress the error onloy when loading checkpoints, or something
like that.
Steve
On 10/23/07, Richard Strong <[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> I am trying to get checkpoints working with ALPHA_SE and have run into
> some problems. When I try to resume a checkpoint I get a fatal message in
> src/mem/page_table.cc:110 fatal("PageTable::allocate: address 0x%x already
> mapped", vaddr);. It appears that an address has already been mapped in the
> page table Why would this happen? Has anyone at least tried making
> checkpoint for a spec2000 benchmark and resuming it for ALPHA_SE? Perhaps I
> am running code at the start of the binary after I restore the checkpoint?
>
> -Richard
>
> I make a checkpoint using:
> ./build/ALPHA_SE/m5.debug configs/example/se.py --max_checkpoints=2
> --take_checkpoints="10000,100" --checkpoint_dir=./checkpoints
>
> I then try to resume a checkpoint with a AtomicSimpleCPU by the command:
> $m5-2.0b3*11:57:44=>./build/ALPHA_SE/m5.debug configs/example/se.py -r 1
> --checkpoint_dir=./checkpoints
> M5 Simulator System
>
> Copyright (c) 2001-2006
> The Regents of The University of Michigan
> All Rights Reserved
>
>
> M5 compiled Oct 23 2007 11:57:34
> M5 started Tue Oct 23 12:15:07 2007
> M5 executing on rickshin-2.local
> command line: ./build/ALPHA_SE/m5.debug configs/example/se.py -r 1
> --checkpoint_dir=./checkpoints
> Global frequency set at 1000000000000 ticks per second
> Restoring from checkpoint
> fatal: PageTable::allocate: address 0x11ff92000 already mapped
> @ cycle 10000
> [allocate:build/ALPHA_SE/mem/page_table.cc, line 110]
> Memory Usage: 0 KBytes
>
>
>
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