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[Qemu-devel] [PATCH 16/18] kvm: Do not use qemu_fair_mutex
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] [PATCH 16/18] kvm: Do not use qemu_fair_mutex |
Date: |
Fri, 21 Jan 2011 21:48:20 +0100 |
From: Jan Kiszka <address@hidden>
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 <address@hidden>
---
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)) {
--
1.7.1
- [Qemu-devel] [PATCH 00/18] [uq/master] Rebased patch queue, part I, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 15/18] kvm: Flush coalesced mmio buffer on IO window exits, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 16/18] kvm: Do not use qemu_fair_mutex,
Jan Kiszka <=
- [Qemu-devel] [PATCH 18/18] kvm: x86: Only read/write MSR_KVM_ASYNC_PF_EN if supported, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 17/18] kvm: x86: Implicitly clear nmi_injected/pending on reset, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 13/18] kvm: Consolidate must-have capability checks, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 06/18] kvm: x86: Prepare kvm_get_mp_state for in-kernel irqchip, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 05/18] kvm: x86: Align kvm_arch_put_registers code with comment, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 03/18] kvm: Improve reporting of fatal errors, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 10/18] kvm: x86: Reset paravirtual MSRs, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 01/18] kvm: x86: Swallow KVM_EXIT_SET_TPR, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 07/18] kvm: x86: Remove redundant mp_state initialization, Jan Kiszka, 2011/01/21
- [Qemu-devel] [PATCH 04/18] x86: Optionally dump code bytes on cpu_dump_state, Jan Kiszka, 2011/01/21