[PATCH] Time and seek optimizations
We did too many gettimeofday() calls, this patch cuts the number by
40%. Use clock_gettime() MONOTONIC instead, it is faster on my system
at least.
This patch also optimizes calling lseek() only when necessary for the
sync io engine.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/time.c b/time.c
index d08c791..cb44c20 100644
--- a/time.c
+++ b/time.c
@@ -25,7 +25,7 @@
{
struct timeval t;
- gettimeofday(&t, NULL);
+ fio_gettime(&t, NULL);
return utime_since(s, &t);
}
@@ -49,8 +49,9 @@
unsigned long mtime_since_now(struct timeval *s)
{
struct timeval t;
+ void *p = __builtin_return_address(0);
- gettimeofday(&t, NULL);
+ fio_gettime(&t, p);
return mtime_since(s, &t);
}
@@ -66,7 +67,7 @@
{
struct timeval start;
- gettimeofday(&start, NULL);
+ fio_gettime(&start, NULL);
while (utime_since_now(&start) < usec)
nop;
}
@@ -128,9 +129,9 @@
return mtime_since_now(&genesis);
}
-void time_init(void)
+static void fio_init time_init(void)
{
- gettimeofday(&genesis, NULL);
+ fio_gettime(&genesis, NULL);
}
void fill_start_time(struct timeval *t)