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Subject[PATCH 2/5] Drivers: hv: vmbus: Further improve CPU affiliation logic
Date
From: Dexuan Cui <decui@microsoft.com>

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: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
---
drivers/hv/channel_mgmt.c | 20 ++++++++++++++++++--
include/linux/hyperv.h | 1 +
2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index f52373a..3ab4753 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -447,8 +447,24 @@ 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);
- cpumask_set_cpu(cur_cpu, alloced_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];
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 34cf811..30d3a1f 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -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,
--
1.7.4.1


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