I was researching on system load averages and came across this blog post : brendangregg.com/blog/2017-08-

I was surprised with the dedication that this person went ( literally ) digging into archives from 24 years to find the source of one particular change - why factors disk usage ( or any TASK_UNINTERRUPTIBLE process ) into the system load equation.

( thread )

> I dumped "git log -p" for the entire Linux github repository, which was 4 Gbytes of text, and began reading it backwards to see when the code first appeared. This, too, was a dead end. The oldest change in the entire Linux repo dates back to 2005, when Linus imported Linux 2.6.12-rc2, and this change predates that.


> Trying to discover, at least, when this change occurred, I searched tarballs on kernel.org and found that it had changed by 0.99.15, and not by 0.99.13 – however, the tarball for 0.99.14 was missing. I found it elsewhere, and confirmed that the change was in Linux 0.99 patchlevel 14, Nov 1993. I was hoping that the release description for 0.99.14 by Linus would explain the change, but that too, was a dead end:

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> My search was starting to feel cursed. Thankfully, I found some older linux-devel mailing list archives, rescued from server backups, often stored as tarballs of digests. I searched over 6,000 digests containing over 98,000 emails, 30,000 of which were from 1993. But it was somehow missing from all of them. It really looked as if the original patch description might be lost forever, and the "why" would remain a mystery.

> Fortunately, I did finally find the change, in a compressed mailbox file from 1993 on oldlinux.org.


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