diff options
Diffstat (limited to 'time/tst-cpuclock1.c')
| -rw-r--r-- | time/tst-cpuclock1.c | 52 |
1 files changed, 22 insertions, 30 deletions
diff --git a/time/tst-cpuclock1.c b/time/tst-cpuclock1.c index 0120906..1ac611a 100644 --- a/time/tst-cpuclock1.c +++ b/time/tst-cpuclock1.c @@ -26,6 +26,7 @@ #include <signal.h> #include <stdint.h> #include <sys/wait.h> +#include <support/timespec.h> /* This function is intended to rack up both user and system time. */ static void @@ -155,16 +156,12 @@ do_test (void) printf ("live PID %d after sleep => %ju.%.9ju\n", child, (uintmax_t) after.tv_sec, (uintmax_t) after.tv_nsec); - struct timespec diff = { .tv_sec = after.tv_sec - before.tv_sec, - .tv_nsec = after.tv_nsec - before.tv_nsec }; - if (diff.tv_nsec < 0) - { - --diff.tv_sec; - diff.tv_nsec += 1000000000; - } - if (diff.tv_sec != 0 - || diff.tv_nsec > 600000000 - || diff.tv_nsec < 100000000) + /* The bound values are empirically defined by testing this code over high cpu + usage and different nice values. Of all the values we keep the 90th + percentile of values and use those values for our testing allowed range. */ + struct timespec diff = timespec_sub (support_timespec_normalize (after), + support_timespec_normalize (before)); + if (!support_timespec_check_in_range (sleeptime, diff, .9, 1.1)) { printf ("before - after %ju.%.9ju outside reasonable range\n", (uintmax_t) diff.tv_sec, (uintmax_t) diff.tv_nsec); @@ -194,19 +191,16 @@ do_test (void) } else { - struct timespec d = { .tv_sec = afterns.tv_sec - after.tv_sec, - .tv_nsec = afterns.tv_nsec - after.tv_nsec }; - if (d.tv_nsec < 0) - { - --d.tv_sec; - d.tv_nsec += 1000000000; - } - if (d.tv_sec > 0 - || d.tv_nsec < sleeptime.tv_nsec - || d.tv_nsec > sleeptime.tv_nsec * 2) + /* The bound values are empirically defined by testing this code over + high cpu usage and different nice values. Of all the values we keep + the 90th percentile of values and use those values for our testing + allowed range. */ + diff = timespec_sub (support_timespec_normalize (afterns), + support_timespec_normalize (after)); + if (!support_timespec_check_in_range (sleeptime, diff, .9, 1.2)) { printf ("nanosleep time %ju.%.9ju outside reasonable range\n", - (uintmax_t) d.tv_sec, (uintmax_t) d.tv_nsec); + (uintmax_t) diff.tv_sec, (uintmax_t) diff.tv_nsec); result = 1; } } @@ -240,15 +234,13 @@ do_test (void) /* Should be close to 0.6. */ printf ("dead PID %d => %ju.%.9ju\n", child, (uintmax_t) dead.tv_sec, (uintmax_t) dead.tv_nsec); - - diff.tv_sec = dead.tv_sec - after.tv_sec; - diff.tv_nsec = dead.tv_nsec - after.tv_nsec; - if (diff.tv_nsec < 0) - { - --diff.tv_sec; - diff.tv_nsec += 1000000000; - } - if (diff.tv_sec != 0 || diff.tv_nsec > 200000000) + /* The bound values are empirically defined by testing this code over high cpu + usage and different nice values. Of all the values we keep the 90th + percentile of values and use those values for our testing allowed range. */ + diff = timespec_sub (support_timespec_normalize (dead), + support_timespec_normalize (after)); + sleeptime.tv_nsec = 100000000; + if (!support_timespec_check_in_range (sleeptime, diff, .9, 1.2)) { printf ("dead - after %ju.%.9ju outside reasonable range\n", (uintmax_t) diff.tv_sec, (uintmax_t) diff.tv_nsec); |