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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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10
arch/s390/include/asm/cputime.h
View file

@ -73,18 +73,18 @@ cputime64_to_jiffies64(cputime64_t cputime)
}
/*
* Convert cputime to milliseconds and back.
* Convert cputime to microseconds and back.
*/
static inline unsigned int
cputime_to_msecs(const cputime_t cputime)
cputime_to_usecs(const cputime_t cputime)
{
return cputime_div(cputime, 4096000);
return cputime_div(cputime, 4096);
}
static inline cputime_t
msecs_to_cputime(const unsigned int m)
usecs_to_cputime(const unsigned int m)
{
return (cputime_t) m * 4096000;
return (cputime_t) m * 4096;
}
/*