[kvm-unit-tests PATCH v2 7/8] arm64: microbench: Add time limit for each individual test

[Jingyi Wang]

Besides using separate running times parameter, we add time limit
for loop_test to make sure each test should be done in a certain
time(5 sec here).

Signed-off-by: Jingyi Wang <wangjingy...@huawei.com>
---
 arm/micro-bench.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/arm/micro-bench.c b/arm/micro-bench.c
index 506d2f9..4c962b7 100644
--- a/arm/micro-bench.c
+++ b/arm/micro-bench.c
@@ -23,6 +23,7 @@
 #include <asm/gic-v3-its.h>
 
 #define NTIMES (1U << 16)
+#define MAX_NS (5 * 1000 * 1000 * 1000UL)
 
 static u32 cntfrq;
 
@@ -258,22 +259,26 @@ static void loop_test(struct exit_test *test)
        uint64_t start, end, total_ticks, ntimes = 0;
        struct ns_time total_ns, avg_ns;
 
+       total_ticks = 0;
        if (test->prep) {
                if(!test->prep()) {
                        printf("%s test skipped\n", test->name);
                        return;
                }
        }
-       isb();
-       start = read_sysreg(cntpct_el0);
-       while (ntimes < test->times) {
+
+       while (ntimes < test->times && total_ns.ns < MAX_NS) {
+               isb();
+               start = read_sysreg(cntpct_el0);
                test->exec();
+               isb();
+               end = read_sysreg(cntpct_el0);
+
                ntimes++;
+               total_ticks += (end - start);
+               ticks_to_ns_time(total_ticks, &total_ns);
        }
-       isb();
-       end = read_sysreg(cntpct_el0);
 
-       total_ticks = end - start;
        ticks_to_ns_time(total_ticks, &total_ns);
        avg_ns.ns = total_ns.ns / ntimes;
        avg_ns.ns_frac = total_ns.ns_frac / ntimes;
-- 
2.19.1


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