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kb39: Value reported for Linux free memory is higher than expected
The Unix memory collector for Linux runs free -k to collect data. The output of this command looks like:
| total | used | free | shared | buffers | cached | |
| Mem: | 513920 | 476196 | 37724 | 0 | 4796 | 87840 |
| -/+ buffers/cache: | 383560 | 130360 | ||||
| Swap: | 1048568 | 160916 | 887652 |
The Mem line lists the amount of memory that is currently allocated. Some of allocated memory may not be in use and is available if needed by another process.
The -/+ buffers/cache line displays the amount of memory that is available, regardless of whether it has already been allocated. Longitude uses the data on this line to display the amount of usable memory available on the managed device.
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