What's soft lockup?

[孙世龙 sunshilong]

Thank you for your detailed explanation.

>BTW, bisection process is not linear so it wont take as much as you
>thought. Usually in between kernel versions 10 to 15 steps is all you
>need. Determinism around bisection can be read here:
>https://x-engineer.org/undergraduate-engineering/advanced-mathematics/numerical-methods/the-bisection-method-for-root-finding/
Thank you very much. It's a good method indeed. But I can't do it
because of these reasons:
1. Many drivers depend on the current version of Linux.
2. As you know, only a few versions of Linux have a corresponding xenomai path.

Best Regards.

Rafael David Tinoco <rafaeldtinoco at ubuntu.com> 于2020年7月7日周二 下午11:00写道：
>
> >
> > Yes, that is the idea behind bisection...
>
> BTW, bisection process is not linear so it wont take as much as you
> thought. Usually in between kernel versions 10 to 15 steps is all you
> need. Determinism around bisection can be read here:
> https://x-engineer.org/undergraduate-engineering/advanced-mathematics/numerical-methods/the-bisection-method-for-root-finding/
>
> >
> > You have the git tree of the kernel you're using.. find a commit that
> > builds and does not have the issue.. then find a commit that builds
> > and has the issue. Now you have the "good" commit and the "bad" commit
> > and you will compile your kernel on each step and run your tests.
> >
> > If the kernel works through your test case.. you have a good step, if
> > your kernel does not work.. you have the bad step... you continue this
> > until you find the commit that introduced the issue (or solved it).
> >
> > You will find good tutorials online teaching how to do this.. only
> > thing I have enough time to provide you right now is:
> >
> > https://github.com/rafaeldtinoco/work/tree/master/sources/kernel
> >
> > and
> >
> > https://github.com/rafaeldtinoco/work/blob/master/sources/kernel/.gitbuild.sh
> >
> > it may help you building the kernel in an ubuntu way (faster than
> > usual) considering you have a configuration file in hand.. just read
> > the scripts.
> >
> > Good luck!