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authorBhaktipriya Shridhar <bhaktipriya96@gmail.com>2016-08-30 23:29:51 +0530
committerPaolo Bonzini <pbonzini@redhat.com>2016-09-07 19:34:28 +0200
commit3706feacd007c89f49bdb20c5c1dd17c8badfc43 (patch)
treea719e04c4f1871e8271eb3d2091cef727a3288db /virt/kvm/kvm_main.c
parentf15a75eedc18e1fece8e01f1a6f7d135e61b0750 (diff)
downloadlinux-3706feacd007c89f49bdb20c5c1dd17c8badfc43.tar.bz2
KVM: Remove deprecated create_singlethread_workqueue
The workqueue "irqfd_cleanup_wq" queues a single work item &irqfd->shutdown and hence doesn't require ordering. It is a host-wide workqueue for issuing deferred shutdown requests aggregated from all vm* instances. It is not being used on a memory reclaim path. Hence, it has been converted to use system_wq. The work item has been flushed in kvm_irqfd_release(). The workqueue "wqueue" queues a single work item &timer->expired and hence doesn't require ordering. Also, it is not being used on a memory reclaim path. Hence, it has been converted to use system_wq. System workqueues have been able to handle high level of concurrency for a long time now and hence it's not required to have a singlethreaded workqueue just to gain concurrency. Unlike a dedicated per-cpu workqueue created with create_singlethread_workqueue(), system_wq allows multiple work items to overlap executions even on the same CPU; however, a per-cpu workqueue doesn't have any CPU locality or global ordering guarantee unless the target CPU is explicitly specified and thus the increase of local concurrency shouldn't make any difference. Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r--virt/kvm/kvm_main.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 195078225aa5..b3fa12ce1166 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3807,12 +3807,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
* kvm_arch_init makes sure there's at most one caller
* for architectures that support multiple implementations,
* like intel and amd on x86.
- * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
- * conflicts in case kvm is already setup for another implementation.
*/
- r = kvm_irqfd_init();
- if (r)
- goto out_irqfd;
if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
r = -ENOMEM;
@@ -3894,7 +3889,6 @@ out_free_0a:
free_cpumask_var(cpus_hardware_enabled);
out_free_0:
kvm_irqfd_exit();
-out_irqfd:
kvm_arch_exit();
out_fail:
return r;