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Commit 3b71107d authored by Dexuan Cui's avatar Dexuan Cui Committed by Greg Kroah-Hartman
Browse files

Drivers: hv: vmbus: Further improve CPU affiliation logic 



Keep track of CPU affiliations of sub-channels within the scope of the primary
channel. This will allow us to better distribute the load amongst available
CPUs.

Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9f01ec53

drivers/hv/channel_mgmt.c

+18 −2
Original line number Diff line number Diff line
@@ -448,8 +448,24 @@ static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_gui 
	cpumask_xor(&available_mask, alloced_mask,

		    cpumask_of_node(primary->numa_node));



	cur_cpu = cpumask_next(-1, &available_mask);

	cur_cpu = -1;

	while (true) {

		cur_cpu = cpumask_next(cur_cpu, &available_mask);

		if (cur_cpu >= nr_cpu_ids) {

			cur_cpu = -1;

			cpumask_copy(&available_mask,

				     cpumask_of_node(primary->numa_node));

			continue;

		}



		if (!cpumask_test_cpu(cur_cpu,

				&primary->alloced_cpus_in_node)) {

			cpumask_set_cpu(cur_cpu,

					&primary->alloced_cpus_in_node);

			cpumask_set_cpu(cur_cpu, alloced_mask);

			break;

		}

	}



	channel->target_cpu = cur_cpu;

	channel->target_vp = hv_context.vp_index[cur_cpu];

include/linux/hyperv.h

+1 −0
Original line number Diff line number Diff line
@@ -699,6 +699,7 @@ struct vmbus_channel { 
	/*

	 * State to manage the CPU affiliation of channels.

	 */

	struct cpumask alloced_cpus_in_node;

	int numa_node;

	/*

	 * Support for sub-channels. For high performance devices,