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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>
This commit is contained in:
Chuck Lever 2010-05-07 13:34:37 -04:00 committed by Trond Myklebust
parent bbc72cea58
commit f56916b97f
1 changed files with 8 additions and 2 deletions
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10
include/linux/ktime.h
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@ -130,7 +130,7 @@ static inline ktime_t timeval_to_ktime(struct timeval tv)
/* Convert ktime_t to nanoseconds - NOP in the scalar storage format: */ /* Convert ktime_t to nanoseconds - NOP in the scalar storage format: */
#define ktime_to_ns(kt) ((kt).tv64) #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 * Helper macros/inlines to get the ktime_t math right in the timespec
@ -275,7 +275,7 @@ static inline s64 ktime_to_ns(const ktime_t kt)
return (s64) kt.tv.sec * NSEC_PER_SEC + kt.tv.nsec; 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 * ktime_equal - Compares two ktime_t variables to see if they are equal
@ -295,6 +295,12 @@ static inline s64 ktime_to_us(const ktime_t kt)
return (s64) tv.tv_sec * USEC_PER_SEC + tv.tv_usec; 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) static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)
{ {
return ktime_to_us(ktime_sub(later, earlier)); return ktime_to_us(ktime_sub(later, earlier));