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authorK. Y. Srinivasan <kys@microsoft.com>2015-08-05 00:52:38 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-08-05 11:41:31 -0700
commit9f01ec53458d9e9b68f1c555e773b5d1a1f66e94 (patch)
treece76ed3d4a11ec2035a42a154a735363f642250f /drivers/hv
parent3546448338e76a52d4f86eb3680cb2934e22d89b (diff)
downloadlinux-9f01ec53458d9e9b68f1c555e773b5d1a1f66e94.tar.bz2
Drivers: hv: vmbus: Improve the CPU affiliation for channels
The current code tracks the assigned CPUs within a NUMA node in the context of the primary channel. So, if we have a VM with a single NUMA node with 8 VCPUs, we may end up unevenly distributing the channel load. Fix the issue by tracking affiliations globally. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/channel_mgmt.c11
-rw-r--r--drivers/hv/hv.c9
-rw-r--r--drivers/hv/hyperv_vmbus.h5
3 files changed, 20 insertions, 5 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 30613dfa38b3..39c5afc7970c 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -392,6 +392,7 @@ static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_gui
struct vmbus_channel *primary = channel->primary_channel;
int next_node;
struct cpumask available_mask;
+ struct cpumask *alloced_mask;
for (i = IDE; i < MAX_PERF_CHN; i++) {
if (!memcmp(type_guid->b, hp_devs[i].guid,
@@ -409,7 +410,6 @@ static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_gui
* channel, bind it to cpu 0.
*/
channel->numa_node = 0;
- cpumask_set_cpu(0, &channel->alloced_cpus_in_node);
channel->target_cpu = 0;
channel->target_vp = hv_context.vp_index[0];
return;
@@ -434,21 +434,22 @@ static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_gui
channel->numa_node = next_node;
primary = channel;
}
+ alloced_mask = &hv_context.hv_numa_map[primary->numa_node];
- if (cpumask_weight(&primary->alloced_cpus_in_node) ==
+ if (cpumask_weight(alloced_mask) ==
cpumask_weight(cpumask_of_node(primary->numa_node))) {
/*
* We have cycled through all the CPUs in the node;
* reset the alloced map.
*/
- cpumask_clear(&primary->alloced_cpus_in_node);
+ cpumask_clear(alloced_mask);
}
- cpumask_xor(&available_mask, &primary->alloced_cpus_in_node,
+ cpumask_xor(&available_mask, alloced_mask,
cpumask_of_node(primary->numa_node));
cur_cpu = cpumask_next(-1, &available_mask);
- cpumask_set_cpu(cur_cpu, &primary->alloced_cpus_in_node);
+ cpumask_set_cpu(cur_cpu, alloced_mask);
channel->target_cpu = cur_cpu;
channel->target_vp = hv_context.vp_index[cur_cpu];
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 41d8072d61d9..fd93cfde96d0 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -332,6 +332,13 @@ int hv_synic_alloc(void)
size_t ced_size = sizeof(struct clock_event_device);
int cpu;
+ hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids,
+ GFP_ATOMIC);
+ if (hv_context.hv_numa_map == NULL) {
+ pr_err("Unable to allocate NUMA map\n");
+ goto err;
+ }
+
for_each_online_cpu(cpu) {
hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
if (hv_context.event_dpc[cpu] == NULL) {
@@ -345,6 +352,7 @@ int hv_synic_alloc(void)
pr_err("Unable to allocate clock event device\n");
goto err;
}
+
hv_init_clockevent_device(hv_context.clk_evt[cpu], cpu);
hv_context.synic_message_page[cpu] =
@@ -393,6 +401,7 @@ void hv_synic_free(void)
{
int cpu;
+ kfree(hv_context.hv_numa_map);
for_each_online_cpu(cpu)
hv_synic_free_cpu(cpu);
}
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 638370701657..6f258255ac94 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -551,6 +551,11 @@ struct hv_context {
* Support PV clockevent device.
*/
struct clock_event_device *clk_evt[NR_CPUS];
+ /*
+ * To manage allocations in a NUMA node.
+ * Array indexed by numa node ID.
+ */
+ struct cpumask *hv_numa_map;
};
extern struct hv_context hv_context;