Ha! There's the problem. "mount -o remount,rw /" on ubifs takes _minutes_ freshly installed on nor flash. Not a clue why.
I've seen extremely slow remount-rw on SD cards too. Not sure why. Linux bug I think.
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What's it _doing_? It should be almost entirely a vm operation...?
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Not sure. I didn't have any working profiling tools.
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I have printk().
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perf should be able to show some clues afaik
End of conversation
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