Resource allocation in virtualized environments

A method, comprising:

• executing a Virtual Switching (VS) controller in a user space of at least one memory of a node, the VS controller configured to establish different flows of packets between at least one Virtual Machine (VM) running at the node and one or more other VMs running at the node or at one or more other nodes in communication with the node via a network;
• queuing requests to access a shared memory of at least one memory of the node in a plurality of submission queues in a kernel space of the at least one memory, and wherein each submission queue of the plurality of submission queues corresponds to a different user space application initiating requests to access data in the shared memory;
• queuing processed requests to access the shared memory in one or more completion queues in the kernel space;
• based at least in part on at least one of the requests queued in the plurality of submission queues and the processed requests queued in the one or more completion queues, generating flow metadata for each of the different flows of packets representing usage of at least one resource of the node by each of the different flows of packets;
• and
• based at least in part on the generated flow metadata, adjusting at least one of one or more respective memory request rates and one or more respective resource allocations for at least one user space application.

A node, comprising:

• at least one memory configured to be used at least in part as a shared memory in a distributed memory system in a network;
• a network interface configured to communicate with one or more other nodes in the network;
• a user space means for executing a Virtual Switch (VS) controller in a user space of the at least one memory, the VS controller configured to establish different flows of packets between at least one Virtual Machine (VM) running at the node and one or more other VMs running at the node or at the one or more other nodes;
• and
• a kernel space means for:
• queuing requests to access the shared memory in a plurality of submission queues in a kernel space of the at least one memory, wherein each submission queue of the plurality of submission queues corresponds to a different user space application initiating requests to access data in the shared memory;
• queuing processed requests to access the shared memory in one or more completion queues in the kernel space;
• and
• determining one or more respective indications of queue occupancy for at least one queue of the plurality of submission queues and the one or more completion queues;
• and
• wherein the user space means is further for, based at least in part on the determined one or more respective indications of queue occupancy for the at least one queue, using the VS controller to set one or more respective memory request rates for at least one user space application.