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

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

[Tommi Rantala]

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)
        |            ^~~~~

Signed-off-by: Tommi Rantala <tommi.t.rantala@nokia.com>
---
 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;
 	total = finish - start;
 
 	printf("runTime: %4.2f\n", 1.0*total/1000);
-- 
2.26.2

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

[Shuah Khan]

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@nokia.com>
> ---
>   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

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

[Rantala, Tommi T. (Nokia - FI/Espoo)]

On Tue, 2020-10-27 at 14:08 -0600, Shuah Khan wrote:
> 
> > @@ -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?

Hi,

If the define was available in the UAPI headers, then certainly would make
sense to use it. But I would not mess with the kernel internal headers here.

-Tommi

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

[Shuah Khan]

On 10/28/20 1:36 AM, Rantala, Tommi T. (Nokia - FI/Espoo) wrote:
> On Tue, 2020-10-27 at 14:08 -0600, Shuah Khan wrote:
>>
>>> @@ -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?
> 
> Hi,
> 
> If the define was available in the UAPI headers, then certainly would make
> sense to use it. But I would not mess with the kernel internal headers here.

Suggested the wrong file while looking up the define. I was thinking
linux/time64.h

However it isn't part of headers_install, so can't use that one.

Considering the number of places NSEC_PER_MSEC is hard coded
and defined in headers e.g: tools/include/linux/time64.h, probably
should be included in timespec block in time.h

Not something to worry about for this patch. Please add a NSEC_PER_MSEC
define for now in this file.

thanks,
-- Shuah