coroutine: fix /perf/nesting coroutine benchmark

The /perf/nesting benchmark is broken because the counters are
not reset after each iteration. Therefore, nesting is done only
on the first iteration, and skipped on every other.

This patch fixes the issue, and reduces the number of iterations
to make it possible to run the benchmark in a reasonable amount of
time.

Signed-off-by: Gabriel Kerneis <gabriel@kerneis.info>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/tests/test-coroutine.c b/tests/test-coroutine.c
index 2792191f82..15a885e882 100644
--- a/tests/test-coroutine.c
+++ b/tests/test-coroutine.c
@@ -182,17 +182,17 @@ static void perf_nesting(void)
     unsigned int i, maxcycles, maxnesting;
     double duration;
 
-    maxcycles = 100000000;
+    maxcycles = 10000;
     maxnesting = 1000;
     Coroutine *root;
-    NestData nd = {
-        .n_enter  = 0,
-        .n_return = 0,
-        .max      = maxnesting,
-    };
 
     g_test_timer_start();
     for (i = 0; i < maxcycles; i++) {
+        NestData nd = {
+            .n_enter  = 0,
+            .n_return = 0,
+            .max      = maxnesting,
+        };
         root = qemu_coroutine_create(nest);
         qemu_coroutine_enter(root, &nd);
     }