(cc'ing Christoph) On Mon, Aug 22, 2016 at 06:03:48PM +0530, Parav Pandit wrote: > rdmacg: IB/core: rdma controller support > > Patch is generated and tested against below Doug's linux-rdma > git tree. > > URL: git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma.git > Branch: master > > Patchset is also compiled and tested against below Tejun's cgroup tree > using cgroup v2 mode. > URL: git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git > Branch: master > > 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. > > 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 limit enforcement of HCA hw vendor > specific resources. Instead rdma cgroup provides set of APIs > through which vendor specific drivers can do resource accounting > by making use of rdma cgroup. > > Resource limit enforcement is hierarchical. > > When process is migrated with active RDMA resources, rdma cgroup > continues to uncharge original cgroup for allocated resource. New resource > is charged to current process's cgroup, which means if the process is > migrated with active resources, for new resources it will be charged to > new cgroup and old resources will be correctly uncharged from old cgroup. > > Changes from v10: > * (To address comments from Tejun, Christoph) > 1. Removed unused rpool_list_lock from rdma_cgroup structure. > 2. Moved rdma resource definition to rdma cgroup instead of IB stack > 3. Added prefix rdmacg to static instances > 4. Simplified locking with single mutex for all operations > 5. Following approach of atomically allocating object and > charging resource in hirerchy > 6. Code simplification due to single lock > 7. Using for_each_set_bit API for bit operation > 8. Renamed list heads as Objects instead of _head > 9. Renamed list entries as _node instead of _list. > 10. Made usage_num to 64 bit to avoid overflow and to avoid > additional code to track non zero number of usage counts. > * (To address comments from Doug) > 1. Added copyright and GPLv2 license
Looks good to me. I just have a nit in the documentation. Christoph, what do you think? Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
