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Okay, why does `swapoff` exist on Linux? It's completely useless as far as I can tell. It's been running for 24h to swap in like 1.5GB of used swap or so, on a largely idle server with >32GB free RAM. How can it be *this* hilariously inefficient?
This is what it's done over the past 24h. It got rid of most of it quickly, and then the last 100MB or so are taking forever to swap in. WTF? Over the last 50 minutes it seems it hasn't managed to swap in a single page, but it's doing I/O. What is this, an O(nᴸᴼᴸ) algorithm?pic.twitter.com/RArORjswRX
It's managed to swapoff, er, about 100KiB since that tweet (~10h)? So it's not *stuck*, but you could ask someone trained in telegraphy to transmit the swapspace contents in morse code manually and it would be faster.
Disk stats say it's *writing* 6MB/s of stuff, at 1400 IOPS or so (plausible for spinning rust on battery backed RAID card), 80% I/O usage, paging "out" 1400 pages per second. What? Why is it paging stuff *out* with >32GB of RAM free?
exponential slack-off
The poor server just has ADHD. The last 1.5GB are always the hardest to complete.
Can you give it swap elsewhere? Is it swapping other things out of memory to make room to take other things out of swap? What were you doing that had ~2 GB into swap? What does free show?
I said I have 32GB of free RAM. There is zero reason for it to have trouble swapping things in. The server has never run out of RAM. It just got close enough (80% usage peak) for Linux to decide to start swapping a few things out preemptively.
I have hit exactly the same problem recently, and it appears to be not swap off but VMA management routines which will eat lots and lots of cpu time. I'm personally wondering if it's not a regression as it used to be fast no matter what.
I suggest you open a thread on the lkml to report your issue.
It’s called O(MG)
May I steal that big O notation from you? 
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