From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx> --- Documentation/cgroups/memory.txt | 28 ++++++++++++++++++++++++++++ 1 files changed, 28 insertions(+), 0 deletions(-) diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt index 4c95c00..f98d9af 100644 --- a/Documentation/cgroups/memory.txt +++ b/Documentation/cgroups/memory.txt @@ -43,6 +43,7 @@ Features: - usage threshold notifier - oom-killer disable knob and oom-notifier - Root cgroup has no limit controls. + - resource accounting for non reclaimable resources like HugeTLB pages Kernel memory support is work in progress, and the current version provides basically functionality. (See Section 2.7) @@ -75,6 +76,12 @@ Brief summary of control files. memory.kmem.tcp.limit_in_bytes # set/show hard limit for tcp buf memory memory.kmem.tcp.usage_in_bytes # show current tcp buf memory allocation + + memory.hugetlb.<hugepagesize>.limit_in_bytes # set/show limit of "hugepagesize" hugetlb usage + memory.hugetlb.<hugepagesize>.max_usage_in_bytes # show max "hugepagesize" hugetlb usage recorded + memory.hugetlb.<hugepagesize>.usage_in_bytes # show current res_counter usage for "hugepagesize" hugetlb + # see 5.7 for details + 1. History The memory controller has a long history. A request for comments for the memory @@ -279,6 +286,14 @@ per cgroup, instead of globally. * tcp memory pressure: sockets memory pressure for the tcp protocol. +2.8 Non reclaim resouce management + +This helps in enforcing limit on non reclaimable pages like HugeTLB pages. +For non reclaim resource, enforcing limit during actual page allocation +doesn't make sense. Hence this extension enforce limit during mmap(2). +This enables application to fall back to alternative allocation methods +such as allocations using normal page size when HugeTLB allocation fails. + 3. User Interface 0. Configuration @@ -287,6 +302,7 @@ a. Enable CONFIG_CGROUPS b. Enable CONFIG_RESOURCE_COUNTERS c. Enable CONFIG_CGROUP_MEM_RES_CTLR d. Enable CONFIG_CGROUP_MEM_RES_CTLR_SWAP (to use swap extension) +f. Enable CONFIG_MEM_RES_CTLR_NORECLAIM (to use non reclaim extension) 1. Prepare the cgroups (see cgroups.txt, Why are cgroups needed?) # mount -t tmpfs none /sys/fs/cgroup @@ -510,6 +526,18 @@ unevictable=<total anon pages> N0=<node 0 pages> N1=<node 1 pages> ... And we have total = file + anon + unevictable. +5.7 non reclaimable resource control files +For a system supporting two hugepage size (16M and 16G) the control +files include: + + memory.hugetlb.16GB.limit_in_bytes + memory.hugetlb.16GB.max_usage_in_bytes + memory.hugetlb.16GB.usage_in_bytes + memory.hugetlb.16MB.limit_in_bytes + memory.hugetlb.16MB.max_usage_in_bytes + memory.hugetlb.16MB.usage_in_bytes + + 6. Hierarchy support The memory controller supports a deep hierarchy and hierarchical accounting. -- 1.7.9 -- 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>