Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx> CC: David S. Miller <davem@xxxxxxxxxxxxx> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@xxxxxxxxxxxxxx> CC: Eric W. Biederman <ebiederm@xxxxxxxxxxxx> CC: Randy Dunlap <rdunlap@xxxxxxxxxxxx> --- Documentation/cgroups/kmem_cgroups.txt | 27 +++++++++++++++++++++++++++ 1 files changed, 27 insertions(+), 0 deletions(-) create mode 100644 Documentation/cgroups/kmem_cgroups.txt diff --git a/Documentation/cgroups/kmem_cgroups.txt b/Documentation/cgroups/kmem_cgroups.txt new file mode 100644 index 0000000..930e069 --- /dev/null +++ b/Documentation/cgroups/kmem_cgroups.txt @@ -0,0 +1,27 @@ +Kernel Memory Cgroup +==================== + +This document briefly describes the kernel memory cgroup, or "kmem cgroup". +Unlike user memory, kernel memory cannot be swapped. This effectively means +that rogue processes can start operations that pin kernel objects permanently +into memory, exhausting resources of all other processes in the system. + +kmem_cgroup main goal is to control the amount of memory a group of processes +can pin at any given point in time. Other uses of this infrastructure are +expected to come up with time. Right now, the only resource effectively limited +are tcp send and receive buffers. + +TCP network buffers +=================== + +TCP network buffers, both on the send and receive sides, can be controlled +by the kmem cgroup. Once a socket is created, it is attached to the cgroup of +the controller process, where it stays until the end of its lifetime. + +Files +===== + kmem.tcp_maxmem: control the maximum amount in bytes that can be used by + tcp sockets inside the cgroup. + + kmem.tcp_current_memory: current amount in bytes used by all sockets in + this cgroup -- 1.7.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>