getloadavg is supported on Linux, BSDs, Solaris.

Following man page:
RETURN VALUE
       If the load average was unobtainable, -1 is returned; otherwise,
       the number of samples actually retrieved is returned.

accordingly, make stub for systems which don't support this function return -1
for consistency.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 include/qemu/osdep.h | 10 ++++++++++
 meson.build          |  1 +
 2 files changed, 11 insertions(+)

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 475a1c62ff..d30ba73eda 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -779,6 +779,16 @@ static inline int platform_does_not_support_system(const char *command)
 }
 #endif /* !HAVE_SYSTEM_FUNCTION */
 
+/**
+ * If the load average was unobtainable, -1 is returned
+ */
+#ifndef HAVE_GETLOADAVG_FUNCTION
+static inline int getloadavg(double loadavg[], int nelem)
+{
+    return -1;
+}
+#endif /* !HAVE_GETLOADAVG_FUNCTION */
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/meson.build b/meson.build
index dcef8b1e79..7f333cb80e 100644
--- a/meson.build
+++ b/meson.build
@@ -2254,6 +2254,7 @@ config_host_data.set('HAVE_GLIB_WITH_SLICE_ALLOCATOR', glib_has_gslice)
 config_host_data.set('HAVE_OPENPTY', cc.has_function('openpty', dependencies: util))
 config_host_data.set('HAVE_STRCHRNUL', cc.has_function('strchrnul'))
 config_host_data.set('HAVE_SYSTEM_FUNCTION', cc.has_function('system', prefix: '#include <stdlib.h>'))
+config_host_data.set('HAVE_GETLOADAVG_FUNCTION', cc.has_function('getloadavg', prefix: '#include <stdlib.h>'))
 if rbd.found()
   config_host_data.set('HAVE_RBD_NAMESPACE_EXISTS',
                        cc.has_function('rbd_namespace_exists',
-- 
MST

netdev test keeps failing sometimes.
I don't think we should increase the timeout some more:
let's try something else instead, testing how busy the
system is.

Seems to work for me.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 tests/qtest/netdev-socket.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/tests/qtest/netdev-socket.c b/tests/qtest/netdev-socket.c
index 7ba1eff120..bb99d08b5e 100644
--- a/tests/qtest/netdev-socket.c
+++ b/tests/qtest/netdev-socket.c
@@ -18,6 +18,32 @@
 
 #define CONNECTION_TIMEOUT    120
 
+static double connection_timeout(void)
+{
+    double load;
+    int ret = getloadavg(&load, 1);
+
+    /*
+     * If we can't get load data, or load is low because we just started
+     * running, assume load of 1 (we are alone in this system).
+     */
+    if (ret < 1 || load < 1.0) {
+        load = 1.0;
+    }
+    /*
+     * No one wants to wait more than 10 minutes for this test. Higher load?
+     * Too bad.
+     */
+    if (load > 10.0) {
+        fprintf(stderr, "Warning: load %f higher than 10 - test might timeout\n",
+                load);
+        load = 10.0;
+    }
+
+    /* if load is high increase timeout as we might not get a chance to run */
+    return load * CONNECTION_TIMEOUT;
+}
+
 #define EXPECT_STATE(q, e, t)                             \
 do {                                                      \
     char *resp = NULL;                                    \
@@ -31,7 +57,7 @@ do {                                                      \
         if (g_str_equal(resp, e)) {                       \
             break;                                        \
         }                                                 \
-    } while (g_test_timer_elapsed() < CONNECTION_TIMEOUT); \
+    } while (g_test_timer_elapsed() < connection_timeout()); \
     g_assert_cmpstr(resp, ==, e);                         \
     g_free(resp);                                         \
 } while (0)
-- 
MST