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InfluxDB
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Well... What that's showing is that at some point in time you copied some pages into swap. Since there's no competition for that, they have just stayed there. It doesn't mean that you are seeing memory pressure now, only that at some point since the last reboot your memory usage passed the high water mark which encouraged the kernel to start thinking about swap. If you have sysstat installed you can run through sar to see when that was and even get some idea of whether or not any of those pages written to swap were ever read again, but just having some pages written to swap doesn't mean a whole lot on its own.