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taskstats: use real microsecond granularity for CPU times

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The taskstats interface uses microsecond granularity for the user and
system time values.  The conversion from cputime to the taskstats values
uses the cputime_to_msecs primitive which effectively limits the
granularity to milliseconds.  Add the cputime_to_usecs primitive for
architectures that have better, more precise CPU time values.  Remove
cputime_to_msecs primitive because there are no more users left.

Signed-off-by: Michael Holzheu <[email protected]>
Acked-by: Balbir Singh <[email protected]>
Cc: Luck Tony <[email protected]>
Cc: Shailabh Nagar <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Shailabh Nagar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michael Holzheu 2010-10-27 15:34:45 -07:00 • committed by Linus Torvalds
commit d57af9b214
5 changed files with 21 additions and 23 deletions
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12
arch/powerpc/include/asm/cputime.h
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@ -124,23 +124,23 @@ static inline u64 cputime64_to_jiffies64(const cputime_t ct)
}
/*
* Convert cputime <-> milliseconds
* Convert cputime <-> microseconds
*/
extern u64 __cputime_msec_factor;
static inline unsigned long cputime_to_msecs(const cputime_t ct)
static inline unsigned long cputime_to_usecs(const cputime_t ct)
{
return mulhdu(ct, __cputime_msec_factor);
return mulhdu(ct, __cputime_msec_factor) * USEC_PER_MSEC;
}
static inline cputime_t msecs_to_cputime(const unsigned long ms)
static inline cputime_t usecs_to_cputime(const unsigned long us)
{
cputime_t ct;
unsigned long sec;
/* have to be a little careful about overflow */
ct = ms % 1000;
sec = ms / 1000;
ct = us % 1000000;
sec = us / 1000000;
if (ct) {
ct *= tb_ticks_per_sec;
do_div(ct, 1000);