* Linus Torvalds <[email protected]> wrote:
> I mean, really: Andi, point me to anything that was a real problem
> when we had no unwinder at all?
personally, i like perfect stacktraces, alot. x86_64 was a huge pain for
me without the unwinder. I got so used to perfect backtraces on i686
(when using %ebp frames) during the years, and i had to look at _many_
backtraces with lockdep. On x86_64 it was just constant brain-drain to
think away bogus stack entries. Yes, i can do it no problem when i have
to look at only a few stacktraces per day, but if it's hundreds per day
it's _alot_ of brainpower wasted.
(i'd have been happy with an %rbp based unwinder for x86_64, in fact i
implemented it for lockdep and used it for some time on x86_64, but Andi
wanted a dwarf-based, lower-overhead one. Andi also nicely integrated it
into stacktrace.c.)
Ingo
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