From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
The imbalance in the hold time of qemu_global_mutex only exists in TCG
mode. In contrast to TCG VCPUs, KVM drops the global lock during guest
execution. We already avoid touching the fairness lock from the
IO-thread in KVM mode, so also stop using it from the VCPU threads.
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
---
cpus.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/cpus.c b/cpus.c
index 0309189..4c9928e 100644
--- a/cpus.c
+++ b/cpus.c
@@ -735,9 +735,7 @@ static sigset_t block_io_signals(void)
void qemu_mutex_lock_iothread(void)
{
if (kvm_enabled()) {
- qemu_mutex_lock(&qemu_fair_mutex);
qemu_mutex_lock(&qemu_global_mutex);
- qemu_mutex_unlock(&qemu_fair_mutex);
} else {
qemu_mutex_lock(&qemu_fair_mutex);
if (qemu_mutex_trylock(&qemu_global_mutex)) {
--
1.7.2.3
--
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