ktime: introduce ktime_to_ms()
To report ktime statistics to user space in milliseconds, a new helper
is required.
When considering how to do this conversion, I didn't immediately see
why the extra step of converting ktime to a timeval was needed. To
make that more clear, introduce a couple of large comments.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index ce59832..e1ceaa9 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -130,7 +130,7 @@
/* Convert ktime_t to nanoseconds - NOP in the scalar storage format: */
#define ktime_to_ns(kt) ((kt).tv64)
-#else
+#else /* !((BITS_PER_LONG == 64) || defined(CONFIG_KTIME_SCALAR)) */
/*
* Helper macros/inlines to get the ktime_t math right in the timespec
@@ -275,7 +275,7 @@
return (s64) kt.tv.sec * NSEC_PER_SEC + kt.tv.nsec;
}
-#endif
+#endif /* !((BITS_PER_LONG == 64) || defined(CONFIG_KTIME_SCALAR)) */
/**
* ktime_equal - Compares two ktime_t variables to see if they are equal
@@ -295,6 +295,12 @@
return (s64) tv.tv_sec * USEC_PER_SEC + tv.tv_usec;
}
+static inline s64 ktime_to_ms(const ktime_t kt)
+{
+ struct timeval tv = ktime_to_timeval(kt);
+ return (s64) tv.tv_sec * MSEC_PER_SEC + tv.tv_usec / USEC_PER_MSEC;
+}
+
static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)
{
return ktime_to_us(ktime_sub(later, earlier));