Re: New debug kernel installation mechanism committed to HEAD
Hi Matt,
> I realized something very interesting while doing the work, and that
> is the backup kernel and modules created when you installkernel are
> not stripped of their debug info, which means that one will often wind
> up with 3+40 = 43 MB of *BACKUP* kernel and module data after an
> install kernel under the old regime.
:)
>
> The new kernel install rules will automatically strip the debug info
> from the backup copies even while saving the fully debug kernel as
> /kernel, reducing the space used by the backups from ~43MB to ~13MB,
> saving ~30MB, while only eating an additional ~10MB for the new
> debug-enabled /kernel.
I like this plan much better than my strip-all-the-modules plan :)
Btw, is there a how-to somewhere on how one would load a kernel module
into gdb to do post-mortem on a vmcore? If one can't do this, then having
debug info in modules would definitely be less useful.
Should this work? -
gdb -k kernel.0 vmcore.0
gdb> add-symbol-file /nvidia.ko 0xc060d000
gdb> bt
> So, believe it or not, for people who do 'installkernel' a lot with
> debug kernels, these changes will actually save you ~20MB of disk
> space
> in the root partition even though /kernel is 10MB bigger!! Now is
> that cool or what?
Yep, very cool indeed. :)
Andrew.
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