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Commit f56916b9 authored by Chuck Lever's avatar Chuck Lever Committed by Trond Myklebust
Browse files

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: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent bbc72cea

include/linux/ktime.h

+8 −2
Original line number Diff line number Diff line
@@ -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: */

#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 @@ static inline s64 ktime_to_ns(const ktime_t kt) 
	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 @@ static inline s64 ktime_to_us(const ktime_t kt) 
	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));