diff options
| author | K. Y. Srinivasan <kys@microsoft.com> | 2015-08-05 10:52:38 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-05 21:41:31 +0300 |
| commit | 9f01ec53458d9e9b68f1c555e773b5d1a1f66e94 (patch) | |
| tree | ce76ed3d4a11ec2035a42a154a735363f642250f /drivers/hv/channel_mgmt.c | |
| parent | 3546448338e76a52d4f86eb3680cb2934e22d89b (diff) | |
| download | linux-9f01ec53458d9e9b68f1c555e773b5d1a1f66e94.tar.xz | |
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/channel_mgmt.c')
| -rw-r--r-- | drivers/hv/channel_mgmt.c | 11 |
1 files changed, 6 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]; |