add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/testing/selftests/intel_pstate/aperf.c
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@@ -10,7 +10,11 @@
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 #include <sched.h>
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 #include <errno.h>
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 #include <string.h>
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+#include <time.h>
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 #include "../kselftest.h"
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+
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+#define MSEC_PER_SEC	1000L
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+#define NSEC_PER_MSEC	1000000L
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 void usage(char *name) {
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 	printf ("Usage: %s cpunum\n", name);
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@@ -22,7 +26,7 @@
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 	long long tsc, old_tsc, new_tsc;
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 	long long aperf, old_aperf, new_aperf;
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 	long long mperf, old_mperf, new_mperf;
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-	struct timeb before, after;
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+	struct timespec before, after;
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 	long long int start, finish, total;
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 	cpu_set_t cpuset;
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..
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@@ -55,7 +59,10 @@
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 		return 1;
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 	}
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-	ftime(&before);
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+	if (clock_gettime(CLOCK_MONOTONIC, &before) < 0) {
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+		perror("clock_gettime");
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+		return 1;
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+	}
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 	pread(fd, &old_tsc,  sizeof(old_tsc), 0x10);
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 	pread(fd, &old_aperf,  sizeof(old_mperf), 0xe7);
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 	pread(fd, &old_mperf,  sizeof(old_aperf), 0xe8);
..
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@@ -64,7 +71,10 @@
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 		sqrt(i);
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 	}
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-	ftime(&after);
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+	if (clock_gettime(CLOCK_MONOTONIC, &after) < 0) {
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+		perror("clock_gettime");
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+		return 1;
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+	}
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 	pread(fd, &new_tsc,  sizeof(new_tsc), 0x10);
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 	pread(fd, &new_aperf,  sizeof(new_mperf), 0xe7);
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 	pread(fd, &new_mperf,  sizeof(new_aperf), 0xe8);
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@@ -73,11 +83,11 @@
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 	aperf = new_aperf-old_aperf;
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 	mperf = new_mperf-old_mperf;
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-	start = before.time*1000 + before.millitm;
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-	finish = after.time*1000 + after.millitm;
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+	start = before.tv_sec*MSEC_PER_SEC + before.tv_nsec/NSEC_PER_MSEC;
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+	finish = after.tv_sec*MSEC_PER_SEC + after.tv_nsec/NSEC_PER_MSEC;
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 	total = finish - start;
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-	printf("runTime: %4.2f\n", 1.0*total/1000);
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+	printf("runTime: %4.2f\n", 1.0*total/MSEC_PER_SEC);
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 	printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);
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 	return 0;
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 }