ringtest: use link-time optimization
By using -flto and -fwhole-program, all functions from the ring implementation
can be treated as static and possibly inlined. Force this to happen through
the GCC flatten attribute.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/tools/virtio/ringtest/Makefile b/tools/virtio/ringtest/Makefile
index 877a8a4..c012edb 100644
--- a/tools/virtio/ringtest/Makefile
+++ b/tools/virtio/ringtest/Makefile
@@ -3,8 +3,8 @@
all: ring virtio_ring_0_9 virtio_ring_poll virtio_ring_inorder ptr_ring noring
CFLAGS += -Wall
-CFLAGS += -pthread -O2 -ggdb
-LDFLAGS += -pthread -O2 -ggdb
+CFLAGS += -pthread -O2 -ggdb -flto -fwhole-program
+LDFLAGS += -pthread -O2 -ggdb -flto -fwhole-program
main.o: main.c main.h
ring.o: ring.c main.h
diff --git a/tools/virtio/ringtest/main.c b/tools/virtio/ringtest/main.c
index 147abb4..bda7f0d 100644
--- a/tools/virtio/ringtest/main.c
+++ b/tools/virtio/ringtest/main.c
@@ -96,7 +96,7 @@
assert(!ret);
}
-static void run_guest(void)
+static void __attribute__((__flatten__)) run_guest(void)
{
int completed_before;
int completed = 0;
@@ -149,7 +149,7 @@
}
}
-static void run_host(void)
+static void __attribute__((__flatten__)) run_host(void)
{
int completed_before;
int completed = 0;