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Differential D14725 Diff 45695 tools/tools/syscall_timing/syscall_timing.c

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tools/tools/syscall_timing/syscall_timing.c

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#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>
static struct timespec ts_start, ts_end; static struct timespec ts_start, ts_end;
static int alarm_timeout; static int alarm_timeout;
static volatile int alarm_fired; static volatile int alarm_fired;
#define timespecsub(vvp, uvp) \
do { \
(vvp)->tv_sec -= (uvp)->tv_sec; \
(vvp)->tv_nsec -= (uvp)->tv_nsec; \
if ((vvp)->tv_nsec < 0) { \
(vvp)->tv_sec--; \
(vvp)->tv_nsec += 1000000000; \
} \
} while (0)
#define BENCHMARK_FOREACH(I, NUM) for (I = 0; I < NUM && alarm_fired == 0; I++) #define BENCHMARK_FOREACH(I, NUM) for (I = 0; I < NUM && alarm_fired == 0; I++)
static void static void
alarm_handler(int signum __unused) alarm_handler(int signum __unused)
{ {
alarm_fired = 1; alarm_fired = 1;
} }
▲ Show 20 Lines • Show All 1,027 Lines • ▼ Show 20 Lines for (j = 0; j < argc; j++) {
/* /*
* Run one warmup, then do the real thing (loops) times. * Run one warmup, then do the real thing (loops) times.
*/ */
the_test->t_func(iterations, the_test->t_int, path); the_test->t_func(iterations, the_test->t_int, path);
calls = 0; calls = 0;
for (k = 0; k < loops; k++) { for (k = 0; k < loops; k++) {
calls = the_test->t_func(iterations, the_test->t_int, calls = the_test->t_func(iterations, the_test->t_int,
path); path);
timespecsub(&ts_end, &ts_start); timespecsub(&ts_end, &ts_start, &ts_end);
printf("%s\t%ju\t", the_test->t_name, k); printf("%s\t%ju\t", the_test->t_name, k);
printf("%ju.%09ju\t%ju\t", (uintmax_t)ts_end.tv_sec, printf("%ju.%09ju\t%ju\t", (uintmax_t)ts_end.tv_sec,
(uintmax_t)ts_end.tv_nsec, calls); (uintmax_t)ts_end.tv_nsec, calls);
/* /*
* Note. This assumes that each iteration takes less than * Note. This assumes that each iteration takes less than
* a second, and that our total nanoseconds doesn't exceed * a second, and that our total nanoseconds doesn't exceed
* the room in our arithmetic unit. Fine for system calls, * the room in our arithmetic unit. Fine for system calls,
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