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added documentation to cache memory data collection

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Twan Stok 2023-03-31 03:42:29 +02:00
parent bd9e576486
commit feb3e68d75
1 changed files with 5 additions and 1 deletions
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6
src/app/data_harvester/memory/sysinfo.rs
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@ -38,7 +38,11 @@ pub(crate) fn get_swap_usage(sys: &System) -> Option<MemHarvest> {
}
/// Returns cache usage. sysinfo has no way to do this directly but it should equal the difference
/// between the available and free memory. On windows, this will always be 0.
/// between the available and free memory. Free memory is defined as memory not containing any data,
/// which means cache and buffer memory are not "free". Available memory is defined as memory able
/// to be allocated by processes, which includes cache and buffer memory. On Windows, this will
/// always be 0. For more information, see [docs](https://docs.rs/sysinfo/0.28.4/sysinfo/trait.SystemExt.html#tymethod.available_memory)
/// and [memory explanation](https://askubuntu.com/questions/867068/what-is-available-memory-while-using-free-command)
#[cfg(not(target_os = "windows"))]
pub(crate) fn get_cache_usage(sys: &System) -> Option<MemHarvest> {
let mem_used = sys.available_memory() - sys.free_memory();