This patchset adds support for RDMA cgroup by addressing review comments of [1] by implementing published RFC [2].
Overview: Currently user space applications can easily take away all the rdma device specific resources such as AH, CQ, QP, MR etc. Due to which other applications in other cgroup or kernel space ULPs may not even get chance to allocate any rdma resources. This results into service unavailibility. RDMA cgroup addresses this issue by allowing resource accounting, limit enforcement on per cgroup, per rdma device basis. Resources are not defined by the RDMA cgroup. Resources are defined by RDMA/IB stack & optionally by HCA vendor device drivers. This allows rdma cgroup to remain constant while RDMA/IB stack can evolve without the need of rdma cgroup update. A new resource can be easily added by the RDMA/IB stack without touching rdma cgroup. RDMA uverbs layer will enforce limits on well defined RDMA verb resources without any HCA vendor device driver involvement. RDMA uverbs layer will not do accounting of hw vendor specific resources. Instead rdma cgroup provides set of APIs through which vendor specific drivers can define their own resources (upto 64) that can be accounted by rdma cgroup. Resource limit enforcement is hierarchical. When process is migrated with active RDMA resources, rdma cgroup continues to charge original cgroup. Changes from v0: (To address comments from Haggai, Doug, Liran, Tejun, Sean, Jason) * Redesigned to support per device per cgroup limit settings by bringing concept of resource pool. * Redesigned to let IB stack define the resources instead of rdma controller using resource template. * Redesigned to support hw vendor specific limits setting (optional to drivers). * Created new rdma controller instead of piggyback on device cgroup. * Fixed race conditions for multiple tasks sharing rdma resources. * Removed dependency on the task_struct. [1] https://lkml.org/lkml/2015/9/7/476 [2] https://lkml.org/lkml/2015/10/28/144 This patchset is for Tejun's for-4.5 branch. It is not attempted on Doug's rdma tree yet, which I will do once I receive comments for this pathset. Parav Pandit (6): rdmacg: Added rdma cgroup header file IB/core: Added members to support rdma cgroup rdmacg: implements rdma cgroup IB/core: rdmacg support infrastructure APIs IB/core: use rdma cgroup for resource accounting rdmacg: Added documentation for rdma controller. Documentation/cgroup-legacy/rdma.txt | 129 ++++ Documentation/cgroup.txt | 79 +++ drivers/infiniband/core/Makefile | 1 + drivers/infiniband/core/cgroup.c | 80 +++ drivers/infiniband/core/core_priv.h | 5 + drivers/infiniband/core/device.c | 8 + drivers/infiniband/core/uverbs_cmd.c | 244 ++++++- drivers/infiniband/core/uverbs_main.c | 30 + include/linux/cgroup_rdma.h | 91 +++ include/linux/cgroup_subsys.h | 4 + include/rdma/ib_verbs.h | 20 + init/Kconfig | 12 + kernel/Makefile | 1 + kernel/cgroup_rdma.c | 1220 +++++++++++++++++++++++++++++++++ 14 files changed, 1907 insertions(+), 17 deletions(-) create mode 100644 Documentation/cgroup-legacy/rdma.txt create mode 100644 drivers/infiniband/core/cgroup.c create mode 100644 include/linux/cgroup_rdma.h create mode 100644 kernel/cgroup_rdma.c -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
