Added support for making absolute result

Signed-off-by: Yogesh Tillu <yogesh.tillu@linaro.org>
Reviewed-by: Anders Roxell <anders.roxell@linaro.org>

2 files changed, 15 insertions, 10 deletions

diff --git a/perf_ev_open.c b/perf_ev_open.c
index 9b06586..bfc2fcd 100644
--- a/perf_ev_open.c
+++ b/perf_ev_open.c
@@ -17,6 +17,7 @@
 #include <sys/syscall.h>
 #include <linux/perf_event.h>
 #include <getopt.h>
+#include <math.h>
 
 static int fddev = -1;
 
@@ -81,7 +82,7 @@ int main(int ac, char *argv[])
 	int len = -1, cnt = -1;
 	int *a  = NULL;
 	int *b  = NULL;
-	int i, result, sum = 0;
+	int i, pre_loop_res, post_loop_res, sum = 0;
 
 	while ((option = getopt(ac, argv, "c:n:")) != -1) {
 		switch (option) {
@@ -126,9 +127,9 @@ int main(int ac, char *argv[])
 
 	time_end = cpucycles();
 	/* ---------------------------------- */
-	result = (time_end-time_start)/1000;
+	pre_loop_res = abs(time_end-time_start)/1000;
 	printf("\nsum=%d Avg count [ Loop + Read ] = %ld\n", sum,
-	       (time_end-time_start)/1000);
+	       pre_loop_res);
 	time_start = time_end = 0;
 	/* --------------------Critical section-------------- */
 	time_start = cpucycles();
@@ -137,10 +138,11 @@ int main(int ac, char *argv[])
 
 	time_end = cpucycles();
 	/* ---------------------------------- */
+	post_loop_res = abs(time_end-time_start)/1000;
 	printf("sum=%d Avg count [ Loop        ] = %ld\n", sum,
-	       (time_end-time_start)/1000);
+	       post_loop_res);
 	printf("\n--------------------------------------------------------\n");
-	printf("\tDelay[cpucycles]=%d", result-((time_end-time_start)/1000));
+	printf("\tDelay[cpucycles]=%d\n", abs(post_loop_res - pre_loop_res));
 	printf("\n--------------------------------------------------------\n");
 	free(a);
 	free(b);
diff --git a/perf_rc_mmap.c b/perf_rc_mmap.c
index 180ddd7..79d76ec 100644
--- a/perf_rc_mmap.c
+++ b/perf_rc_mmap.c
@@ -21,6 +21,8 @@
 #include <errno.h>
 #include <string.h>
 #include <getopt.h>
+#include <math.h>
+
 #define barrier()	asm volatile("dmb ish" : : : "memory")
 #define isb()		asm volatile("isb" : : : "memory")
 #define ARMV8_PMCNTENSET_EL0_ENABLE (1<<31) /**< Enable Perf count reg */
@@ -111,7 +113,7 @@ int main(int ac, char *argv[])
 	int *a  = NULL;
 	int *b  = NULL;
 	int len = -1, cnt = -1;
-	int i, result, sum = 0;
+	int i, pre_loop_res, post_loop_res, sum = 0;
 	void *addr; /* mmaped address */
 	unsigned long start_count, stop_count;
 
@@ -168,9 +170,9 @@ int main(int ac, char *argv[])
 
 	stop_count = mmap_read_self(addr);
 	/* --------------------End Critical section-------------- */
-	result = (stop_count-start_count)/1000;
+	pre_loop_res = abs(stop_count-start_count)/1000;
 	printf("\nsum=%d Avg count [ Loop + Read ] = %ld\n", sum,
-	       (stop_count-start_count)/1000);
+		pre_loop_res);
 	start_count = stop_count = 0;
 	/* --------------------Critical section-------------- */
 	start_count = mmap_read_self(addr);
@@ -179,10 +181,11 @@ int main(int ac, char *argv[])
 
 	stop_count = mmap_read_self(addr);
 	/* --------------------End Critical section-------------- */
+	post_loop_res = abs(stop_count-start_count)/1000;
 	printf("sum=%d Avg count [ Loop        ] = %ld\n", sum,
-	       (stop_count-start_count)/1000);
+	       post_loop_res);
 	printf("\n--------------------------------------------------------\n");
-	printf("\tDelay[cpucycles]=%d", result-((stop_count-start_count)/1000));
+	printf("\tDelay[cpucycles]=%d\n", abs(post_loop_res - pre_loop_res));
 	printf("\n--------------------------------------------------------\n");
 	munmap(addr, page_size);
 	free(a);