There is "softlockup_tick()" function in the source code of linux-2.6.32, but what's the corresponding function name in the linux-4.9 or later?

[孙世龙 sunshilong]

Thank you for the clarification.
I have a better understanding of this matter with help.

Valdis Klētnieks <valdis.kletnieks at vt.edu> 于2020年7月6日周一 上午2:58写道：
>
> On Sun, 05 Jul 2020 15:34:32 +0800, "e- d8 i> sunshilong" said:
>
> > There is "softlockup_tick()" function in the source code of
> > linux-2.6.32(refer to
> > https://elixir.bootlin.com/linux/v2.6.32.39/source/kernel/softlockup.c#L104),
> > but what's the corresponding function in the linux-4.9 or later?
> > There is not even a source code file named by softlockup.c in the
> > linux-4.9 or later?
>
> 2.6.32 was a *long* time ago. Heck, even the BKL was still around at that point.
>
> [/usr/src/linux-next] git show v2.6.32
> tag v2.6.32
> Tagger: Linus Torvalds <torvalds at linux-foundation.org>
> Date:   Wed Dec 2 19:51:29 2009 -0800
>
> and there were a *lot* of code changes from then until v4.9.
>
> [/usr/src/linux-next] git diff --shortstat v2.6.32..v4.9
>  59438 files changed, 14713566 insertions(+), 4896973 deletions(-)
>
> Even v4.9 is from long ago and far away, and of less and less relevance
> each new Linux release.
>
> [/usr/src/linux-next] git diff --shortstat v4.9..HEAD
>  73256 files changed, 11345968 insertions(+), 4464267 deletions(-)
>
> So.. since 2.6.32. there's been some 26 million new lines of code, which is an
> interestingly high number considering that there's only 27 million lines of
> code in the tree currently.
>
> In other words, essentially *everything* has been completely re-written and
> re-designed since 2.6.32, and "What is the corresponding function" is a
> question that is probably meaningless, because whatever you're looking for from
> back then has almost certainly been completely re-written with a totally new
> approach.
>
> Seriously - 2.6.32 is of interest only to software archaeologists. There is
> nothing worth looking at in there that's relevant to today's code.
>
> But to answer your question: the entire kernel.softlockup.c file was removed in
> v2.6.36 because it had been replaced by entirely new code.
>