1 files changed, 22 insertions, 0 deletions
diff --git a/src/app/data_harvester/memory/sysinfo.rs b/src/app/data_harvester/memory/sysinfo.rs
index 56844728..119d44c5 100644
--- a/src/app/data_harvester/memory/sysinfo.rs
+++ b/src/app/data_harvester/memory/sysinfo.rs
@@ -36,3 +36,25 @@ 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. 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().saturating_sub(sys.free_memory());
+    let mem_total = sys.total_memory();
+
+    Some(MemHarvest {
+        total_bytes: mem_total,
+        used_bytes: mem_used,
+        use_percent: if mem_total == 0 {
+            None
+        } else {
+            Some(mem_used as f64 / mem_total as f64 * 100.0)
+        },
+    })
+}