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Charles Lindsay authored
Turns out for long-running upgrades we were running them all in parallel, which thrashes the disk pretty hard. This adds a simple mutex lock around each upgrade, so at least the computer is usable while it's going on. A more robust solution would be to have a single-thread thread pool where we enqueue upgrades, but that's too much change this late in the release cycle. Also it turns out that the nullifying of the internaldate_time_t column before we repopulate it was very costly, and unnecessary. So, this also should speed things up for upgrading users. Closes: bgo #724475
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