On Saturday, 6 May 2000 at 18:15:15 -0500, Jeffrey J. Mountin wrote:
> At 07:38 AM 5/6/00 +0930, Greg Lehey wrote:
>> On Thursday, 4 May 2000 at 17:00:35 -0500, Jeffrey J. Mountin wrote:
>>> At 11:40 AM 5/4/00 +0930, Greg Lehey wrote:
>>>> There's a separate issue about whether to build kernels with debug
>>>> symbols by default. That takes a lot more space (30 MB as compared to
>>>> about 8). But if you have a debug kernel, I don't see any reason to
>>>> install a stripped version.
>>>
>>> Running the non-stripped kernel uses more memory
>>
>> No, this isn't correct, not with ELF.
>>
>>> and isn't there also a performance issue.
>>
>> No.
>
> Thanks for clarifying that, but were either memory or performance an
> issue back in the AOUT days? I seem to recall something to that
> point, but might be wrong.
Yes, if you booted an a.out debug kernel, you ended up loading the
entire kernel, including debug symbols, into memory.
>>> Also what is gained by running it,
>>
>> Disk space.
>
> Then it's an issue of disk layout. I use a 100 MB root, which should be
> good for number of years to come and /var is not a part of the root
> partition. IMO space is (or should be) a non-issue or at least should be
> for most. YMMV and don't care to beat that horse some once more.
Sure, that's one of the issues I mentioned. But I think 100 MB is
fine for a couple of debug kernels. My main machine (which I don't
use for debugging) has only 30 MB in the root file system.
>>> as long as you have the complimentary debug kernel in /var/crash (or
>>> wherever) for the stripped boot kernel.
>>
>> It's the one that savecore saves, and there's more opportunity for
>> using the wrong debug kernel for dump analysis.
>
> True, but then one would hope someone doing analysis would know
> better.
It's not a question of knowing better, it's a question of
honest-to-god mistakes. I make enough of them myself.
> Maybe there should be an "make install debug" that would either
> install the debug version instead of the stripped version *or*
> install it in /var/crash.
Indeed, there *is* a make install.debug (note spelling) which installs
the debug version instead of the stripped version.
> If there are no memory or performance issues with the debug kernel,
> then I wouldn't mind it being installed as the default. Then those
> that wish to strip it may do so. As always the point is who gains
> changing the current method.
I tried this a while back. There was a lot of resistance.
Greg
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