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[v1.05] Check read return value in frequency measurement

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Dr-Noob
2024-07-09 08:32:24 +01:00
parent 8506c91e00
commit da1981b97c
1 changed files with 12 additions and 3 deletions
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15
src/common/freq.c
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@@ -130,7 +130,18 @@ int64_t measure_max_frequency(uint32_t core) {
nop_function(iters);
read(fd, &instructions, sizeof(uint64_t));
// Clean screen once measurement is finished
printf("\r%*c\r", (int) strlen(frequency_banner), ' ');
ssize_t ret = read(fd, &instructions, sizeof(uint64_t));
if (ret == -1) {
perror("read");
return -1;
}
if (ret != sizeof(uint64_t)) {
printErr("Read returned %d, expected %d", ret, sizeof(uint64_t));
return -1;
}
if(ioctl(fd, PERF_EVENT_IOC_DISABLE, 0) == -1) {
perror("ioctl");
return -1;
@@ -143,8 +154,6 @@ int64_t measure_max_frequency(uint32_t core) {
uint64_t nsecs = (end.tv_sec*1e9 + end.tv_nsec) - (start.tv_sec*1e9 + start.tv_nsec);
uint64_t usecs = nsecs/1000;
double frequency = instructions/((double)usecs);
printf("\r%*c\r", (int) strlen(frequency_banner), ' ');
// Discard last digit in the frequency, which should help providing
// more reliable and predictable values.