The patch titled Subject: memcg: add memory controller documentation for hugetlb management has been removed from the -mm tree. Its filename was memcg-add-memory-controller-documentation-for-hugetlb-management.patch This patch was dropped because an updated version will be merged The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx> Subject: memcg: add memory controller documentation for hugetlb management Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: Hillf Danton <dhillf@xxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- Documentation/cgroups/memory.txt | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff -puN Documentation/cgroups/memory.txt~memcg-add-memory-controller-documentation-for-hugetlb-management Documentation/cgroups/memory.txt --- a/Documentation/cgroups/memory.txt~memcg-add-memory-controller-documentation-for-hugetlb-management +++ a/Documentation/cgroups/memory.txt @@ -42,6 +42,7 @@ Features: - usage threshold notifier - oom-killer disable knob and oom-notifier - Root cgroup has no limit controls. + - resource accounting for HugeTLB pages Kernel memory support is work in progress, and the current version provides basically functionality. (See Section 2.7) @@ -74,6 +75,12 @@ 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 @@ -280,6 +287,15 @@ per cgroup, instead of globally. * tcp memory pressure: sockets memory pressure for the tcp protocol. +2.8 HugeTLB extension + +This extension allows to limit the HugeTLB usage per control group and +enforces the controller limit during page fault. Since HugeTLB doesn't +support page reclaim, enforcing the limit at page fault time implies that, +the application will get SIGBUS signal if it tries to access HugeTLB pages +beyond its limit. This requires the application to know beforehand how much +HugeTLB pages it would require for its use. + 3. User Interface 0. Configuration @@ -288,6 +304,7 @@ 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_HUGETLB (to use HugeTLB extension) 1. Prepare the cgroups (see cgroups.txt, Why are cgroups needed?) # mount -t tmpfs none /sys/fs/cgroup @@ -507,6 +524,18 @@ unevictable=<total anon pages> N0=<node And we have total = file + anon + unevictable. +5.7 HugeTLB 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. _ Patches currently in -mm which might be from aneesh.kumar@xxxxxxxxxxxxxxxxxx are linux-next.patch memcg-fix-error-code-in-hugetlb_force_memcg_empty.patch memcg-fix-error-code-in-hugetlb_force_memcg_empty-v2.patch memcg-fix-error-code-in-hugetlb_force_memcg_empty-v2-checkpatch-fixes.patch memcg-use-res_counter_uncharge_until-in-mem_cgroup_move_hugetlb_parent.patch memcg-move-charges-to-root-cgroup-if-use_hierarchy=0-in-mem_cgroup_move_hugetlb_parent.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html