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@xxxxxxxxxxxxxxxxxxxx> 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 But to answer your question: the entire kernel.softlockup.c file was removed in v2.6.36 because it had been replaced by entirely new code.
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