fix proc meminfo cached calculation (netdata#15859)

stelfrag · Aug 21, 2023 · 56479af · 56479af
1 parent 2fe29f9
commit 56479af
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/collectors/proc.plugin/proc_meminfo.c b/collectors/proc.plugin/proc_meminfo.c
@@ -230,7 +230,9 @@ int do_proc_meminfo(int update_every, usec_t dt) {
     }
 
     // http://calimeroteknik.free.fr/blag/?article20/really-used-memory-on-gnu-linux
-    unsigned long long MemCached = Cached + SReclaimable + KReclaimable - Shmem;
+    // KReclaimable includes SReclaimable, it was added in kernel v4.20
+    unsigned long long reclaimable = KReclaimable > 0 ? KReclaimable : SReclaimable;
+    unsigned long long MemCached = Cached + reclaimable - Shmem;
     unsigned long long MemUsed = MemTotal - MemFree - MemCached - Buffers;
     // The Linux kernel doesn't report ZFS ARC usage as cache memory (the ARC is included in the total used system memory)
     if (!inside_lxc_container) {