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authorJan Kiszka <jan.kiszka@siemens.com>2012-04-24 18:40:17 +0400
committerMarcelo Tosatti <mtosatti@redhat.com>2012-04-28 02:40:29 +0400
commitb6ddf05ff68d81a7c1736717faf492b70e9bf4f9 (patch)
treedbcf0f64e8bd0e420a498b6d074b5f0d1afc91ed /arch/x86/kvm/i8254.h
parent0589ff6c11d8128cf053c3ddc75b0f6d8b71c62b (diff)
downloadlinux-b6ddf05ff68d81a7c1736717faf492b70e9bf4f9.tar.xz
KVM: x86: Run PIT work in own kthread
We can't run PIT IRQ injection work in the interrupt context of the host timer. This would allow the user to influence the handler complexity by asking for a broadcast to a large number of VCPUs. Therefore, this work was pushed into workqueue context in 9d244caf2e. However, this prevents prioritizing the PIT injection over other task as workqueues share kernel threads. This replaces the workqueue with a kthread worker and gives that thread a name in the format "kvm-pit/<owner-process-pid>". That allows to identify and adjust the kthread priority according to the VM process parameters. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kvm/i8254.h')
-rw-r--r--arch/x86/kvm/i8254.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/kvm/i8254.h b/arch/x86/kvm/i8254.h
index 51a97426e791..fdf40425ea1d 100644
--- a/arch/x86/kvm/i8254.h
+++ b/arch/x86/kvm/i8254.h
@@ -1,6 +1,8 @@
#ifndef __I8254_H
#define __I8254_H
+#include <linux/kthread.h>
+
#include "iodev.h"
struct kvm_kpit_channel_state {
@@ -39,8 +41,9 @@ struct kvm_pit {
struct kvm_kpit_state pit_state;
int irq_source_id;
struct kvm_irq_mask_notifier mask_notifier;
- struct workqueue_struct *wq;
- struct work_struct expired;
+ struct kthread_worker worker;
+ struct task_struct *worker_task;
+ struct kthread_work expired;
};
#define KVM_PIT_BASE_ADDRESS 0x40