Basic kernel memory functionality for the Memory Controller

This patch lays down the foundation for the kernel memory component
of the Memory Controller.

As of today, I am only laying down the following files:

 * memory.independent_kmem_limit
 * memory.kmem.limit_in_bytes (currently ignored)
 * memory.kmem.usage_in_bytes (always zero)

Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: Kirill A. Shutemov <kirill@shutemov.name>
CC: Paul Menage <paul@paulmenage.org>
CC: Greg Thelen <gthelen@google.com>
CC: Johannes Weiner <jweiner@redhat.com>
CC: Michal Hocko <mhocko@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 0 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 43298f9810fb..b8930d5a8325 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -689,6 +689,17 @@ config CGROUP_MEM_RES_CTLR_SWAP_ENABLED
           For those who want to have the feature enabled by default should
           select this option (if, for some reason, they need to disable it
           then swapaccount=0 does the trick).
+config CGROUP_MEM_RES_CTLR_KMEM
+        bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
+        depends on CGROUP_MEM_RES_CTLR && EXPERIMENTAL
+        default n
+        help
+          The Kernel Memory extension for Memory Resource Controller can limit
+          the amount of memory used by kernel objects in the system. Those are
+          fundamentally different from the entities handled by the standard
+          Memory Controller, which are page-based, and can be swapped. Users of
+          the kmem extension can use it to guarantee that no group of processes
+          will ever exhaust kernel resources alone.
 
 config CGROUP_PERF
         bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"