add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/Documentation/admin-guide/cgroup-v1/memory.rst
..
..
@@ -82,6 +82,8 @@
82
82
  memory.swappiness		     set/show swappiness parameter of vmscan
83
83
 				     (See sysctl's vm.swappiness)
84
84
  memory.move_charge_at_immigrate     set/show controls of moving charges
85
+                                     This knob is deprecated and shouldn't be
86
+                                     used.
85
87
  memory.oom_control		     set/show oom controls.
86
88
  memory.numa_stat		     show the number of memory usage per numa
87
89
 				     node
..
..
@@ -740,8 +742,15 @@
740
742
        It is recommended to set the soft limit always below the hard limit,
741
743
        otherwise the hard limit will take precedence.
742
744
 
743
-8. Move charges at task migration
744
-=================================
745
+8. Move charges at task migration (DEPRECATED!)
746
+===============================================
747
+
748
+THIS IS DEPRECATED!
749
+
750
+It's expensive and unreliable! It's better practice to launch workload
751
+tasks directly from inside their target cgroup. Use dedicated workload
752
+cgroups to allow fine-grained policy adjustments without having to
753
+move physical pages between control domains.
745
754
 
746
755
 Users can move charges associated with a task along with task migration, that
747
756
 is, uncharge task's pages from the old cgroup and charge them to the new cgroup.