Re: [Qemu-devel] thread synchronization in qcow2.c and qcow2-cluster.c

[Stefan Hajnoczi <stefanha@gmail.com>]

On Tue, Apr 27, 2010 at 9:39 PM, Chunqiang (CQ) Tang <tangchq@gmail.com> wrote:
> Thank you for the information. I also suspected that
> qemu_mutex_lock_iothread() does the synchronization. However, my
> profiling showed that qemu-kvm.c:kvm_cpu_exec() in is actually
> executed, instead of kvm-all.c:kvm_cpu_exec().

Are you using qemu-kvm.git?

Can you double check that qemu-kvm.o is being linked in instead of kvm-all.o?

I looked at the link map for qemu-system-x86_64 and verified that
kvm-all.o is linked in and qemu-kvm.o is not linked in.

Stefan

diff --git a/Makefile.target b/Makefile.target
index 1ffd802..122b951 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -30,6 +30,7 @@ endif

 PROGS=$(QEMU_PROG)

+LDFLAGS+=-Wl,-Map=$(QEMU_PROG).map
 LIBS+=-lm

 kvm.o kvm-all.o: QEMU_CFLAGS+=$(KVM_CFLAGS)