Re: [Xen-devel] Xen at scale

[Alex Ho <alex.ho@xxxxxxxxxxxx>]

can you call pdb-stub.c::breakpoint() early on during the domain startup
to force it into the debugger?   i'm planning to check in some code later
this week which will make debugging domains and processes a lot easier.

.a

On Tue, 23 Mar 2004 14:37:20 -0800
"MAGENHEIMER,DAN (HP-FtCollins,ex1)" <dan.magenheimer@xxxxxx> wrote:

> >> My wish list based on my experience so far:
> >>        HIGHMEM4G - This is my top wish, and I will work on it myself
> >>             when I get a chance, though I can't say when that
> >> will be.
> >
> >Agreed. It should just be a case of putting the CONFIG_HIGHMEM4G
> >stuff back into the following files:
> >
> >./include/asm-xeno/fixmap.h
> >./include/asm-xeno/highmem.h
> >./include/asm-xeno/pgtable.h
> >./include/asm-xeno/page.h
> >./arch/xeno/config.in
> >./arch/xeno/mm/init.c
> >./arch/xeno/kernel/setup.c
> 
> Here's a patch that adds back the CONFIG_HIGHMEM stuff.  It works
> fine with CONFIG_HIGHMEM off and with CONFIG_HIGHMEM on with
> dom0_memory <= 512MB, but fails with dom0_memory == 1GB (1048576)
> on my 2GB machine.
> 
> The failure condition is that DOM0 barely launches, then causes
> Xen to die and the machine reboots (even with reboot disabled, so
> it must be trashing something in Xen itself).  I haven't been able
> to get any debugging output (even panics) to show up from dom0 at all...
> perhaps this will be a good opportunity to try out Alex's pdb
> stuff.  (Alex, is there any way to set a breakpoint very early
> in xenolinux startup?)
> 
> Anyway, I thought I'd post it in case someone with more xenolinux
> setup/init debugging experience can easily spot/fix the problem,
> but I'll keep trying.  (Please email if you find/fix it, to put
> me out of my misery ;-)
> 
> As it works for everything that works today, the patch could be rolled
> into the mainline, possibly with a runtime check and nicer error
> message added.
> 
> Dan Magenheimer
> HP Labs Fort Collins
> 
> P.S. No changes appeared to be required in page.h or setup.c
> and I changed defconfig instead of config.in.
> 
> 


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