cgclassify: add page (#11437)

pages/linux/cgclassify.md

@@ -0,0 +1,16 @@
+# cgclassify
+
+> Move running task(s) to given `cgroups`.
+> More information: <https://manned.org/cgclassify>.
+
+- Move the process with a specific PID to the control group student in the CPU hierarchy:
+
+`cgclassify -g {{cpu:student}} {{1234}}`
+
+- Move the process with a specific PID to control groups based on the `/etc/cgrules.conf` configuration file:
+
+`cgclassify {{1234}}`
+
+- Move the process with a specific PID to the control group student in the CPU hierarchy. Note: The daemon of the service `cgred` does not change `cgroups` of the specific PID and its children (based on `/etc/cgrules.conf`):
+
+`cgclassify --sticky -g {{cpu:/student}} {{1234}}`