Re: [PATCH] selftests: intel_pstate: ftime() is deprecated

From: Shuah Khan
Date: Tue Oct 27 2020 - 16:08:37 EST


Hi Tommi,

On 10/16/20 7:22 AM, Tommi Rantala wrote:
Use clock_gettime() instead of deprecated ftime().

aperf.c: In function ‘main’:
aperf.c:58:2: warning: ‘ftime’ is deprecated [-Wdeprecated-declarations]
58 | ftime(&before);
| ^~~~~
In file included from aperf.c:9:
/usr/include/sys/timeb.h:39:12: note: declared here
39 | extern int ftime (struct timeb *__timebuf)
| ^~~~~


Thanks for the fix. One comment below

Signed-off-by: Tommi Rantala <tommi.t.rantala@xxxxxxxxx>
---
tools/testing/selftests/intel_pstate/aperf.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/intel_pstate/aperf.c b/tools/testing/selftests/intel_pstate/aperf.c
index f6cd03a87493..eea9dbab459b 100644
--- a/tools/testing/selftests/intel_pstate/aperf.c
+++ b/tools/testing/selftests/intel_pstate/aperf.c
@@ -10,6 +10,7 @@
#include <sched.h>
#include <errno.h>
#include <string.h>
+#include <time.h>
#include "../kselftest.h"
void usage(char *name) {
@@ -22,7 +23,7 @@ int main(int argc, char **argv) {
long long tsc, old_tsc, new_tsc;
long long aperf, old_aperf, new_aperf;
long long mperf, old_mperf, new_mperf;
- struct timeb before, after;
+ struct timespec before, after;
long long int start, finish, total;
cpu_set_t cpuset;
@@ -55,7 +56,10 @@ int main(int argc, char **argv) {
return 1;
}
- ftime(&before);
+ if (clock_gettime(CLOCK_MONOTONIC, &before) < 0) {
+ perror("clock_gettime");
+ return 1;
+ }
pread(fd, &old_tsc, sizeof(old_tsc), 0x10);
pread(fd, &old_aperf, sizeof(old_mperf), 0xe7);
pread(fd, &old_mperf, sizeof(old_aperf), 0xe8);
@@ -64,7 +68,10 @@ int main(int argc, char **argv) {
sqrt(i);
}
- ftime(&after);
+ if (clock_gettime(CLOCK_MONOTONIC, &after) < 0) {
+ perror("clock_gettime");
+ return 1;
+ }
pread(fd, &new_tsc, sizeof(new_tsc), 0x10);
pread(fd, &new_aperf, sizeof(new_mperf), 0xe7);
pread(fd, &new_mperf, sizeof(new_aperf), 0xe8);
@@ -73,8 +80,8 @@ int main(int argc, char **argv) {
aperf = new_aperf-old_aperf;
mperf = new_mperf-old_mperf;
- start = before.time*1000 + before.millitm;
- finish = after.time*1000 + after.millitm;
+ start = before.tv_sec*1000 + before.tv_nsec/1000000L;
+ finish = after.tv_sec*1000 + after.tv_nsec/1000000L;

Why not use timespec dNSEC_PER_MSEC define from include/vdso/time64.h?

thanks,
-- Shuah