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a Fallback for kernels < 3.14 where /proc/meminfo does not provide
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https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/
commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773
XXX: on recent kernels this calculation differs by ~1.5% than
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https://gitlab.com/procps-ng/procps/issues/42
https://github.com/famzah/linux-memavailable-procfs/issues/2
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a Return hardware fans info (for CPU and other peripherals) as a
dict including hardware label and current speed.
Implementation notes:
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only (old distros will probably use something else)
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