101 lines
2 KiB
C
101 lines
2 KiB
C
#include <unistd.h>
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#include <math.h>
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#include <sys/time.h>
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#include <time.h>
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#include "fio.h"
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#include "smalloc.h"
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struct timeval *fio_tv = NULL;
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int fio_gtod_offload = 0;
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static pthread_t gtod_thread;
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static os_cpu_mask_t fio_gtod_cpumask;
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void fio_gtod_init(void)
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{
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if (fio_tv)
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return;
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fio_tv = smalloc(sizeof(struct timeval));
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if (!fio_tv)
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log_err("fio: smalloc pool exhausted\n");
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}
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static void fio_gtod_update(void)
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{
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if (fio_tv) {
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struct timeval __tv;
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gettimeofday(&__tv, NULL);
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fio_tv->tv_sec = __tv.tv_sec;
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write_barrier();
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fio_tv->tv_usec = __tv.tv_usec;
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write_barrier();
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}
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}
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struct gtod_cpu_data {
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struct fio_mutex *mutex;
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unsigned int cpu;
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};
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static void *gtod_thread_main(void *data)
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{
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struct fio_mutex *mutex = data;
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fio_setaffinity(gettid(), fio_gtod_cpumask);
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fio_mutex_up(mutex);
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/*
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* As long as we have jobs around, update the clock. It would be nice
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* to have some way of NOT hammering that CPU with gettimeofday(),
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* but I'm not sure what to use outside of a simple CPU nop to relax
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* it - we don't want to lose precision.
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*/
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while (threads) {
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fio_gtod_update();
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nop;
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}
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return NULL;
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}
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int fio_start_gtod_thread(void)
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{
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struct fio_mutex *mutex;
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pthread_attr_t attr;
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int ret;
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mutex = fio_mutex_init(FIO_MUTEX_LOCKED);
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if (!mutex)
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return 1;
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pthread_attr_init(&attr);
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pthread_attr_setstacksize(&attr, 2 * PTHREAD_STACK_MIN);
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ret = pthread_create(>od_thread, &attr, gtod_thread_main, mutex);
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pthread_attr_destroy(&attr);
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if (ret) {
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log_err("Can't create gtod thread: %s\n", strerror(ret));
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goto err;
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}
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ret = pthread_detach(gtod_thread);
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if (ret) {
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log_err("Can't detach gtod thread: %s\n", strerror(ret));
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goto err;
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}
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dprint(FD_MUTEX, "wait on startup_mutex\n");
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fio_mutex_down(mutex);
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dprint(FD_MUTEX, "done waiting on startup_mutex\n");
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err:
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fio_mutex_remove(mutex);
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return ret;
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}
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void fio_gtod_set_cpu(unsigned int cpu)
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{
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#ifdef FIO_HAVE_CPU_AFFINITY
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fio_cpu_set(&fio_gtod_cpumask, cpu);
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#endif
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}
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