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taskstats: use real microsecond granularity for CPU times 

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 <holzheu@linux.vnet.ibm.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Luck Tony <tony.luck@intel.com>
Cc: Shailabh Nagar <nagar1234@in.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Shailabh Nagar <nagar@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Holzheu 2010-10-27 15:34:45 -07:00 committed by Linus Torvalds
parent 3d9e0cf1fe
commit d57af9b214
5 changed files with 21 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/ia64/include/asm/cputime.h
View File

@ -56,10 +56,10 @@ typedef u64 cputime64_t;
#define jiffies64_to_cputime64(__jif) ((__jif) * (NSEC_PER_SEC / HZ))
/*
* Convert cputime <-> milliseconds
* Convert cputime <-> microseconds
*/
#define cputime_to_msecs(__ct) ((__ct) / NSEC_PER_MSEC)
#define msecs_to_cputime(__msecs) ((__msecs) * NSEC_PER_MSEC)
#define cputime_to_usecs(__ct) ((__ct) / NSEC_PER_USEC)
#define usecs_to_cputime(__usecs) ((__usecs) * NSEC_PER_USEC)
/*
* Convert cputime <-> seconds

12
arch/powerpc/include/asm/cputime.h
View File

@ -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);

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;
}
/*

6
include/asm-generic/cputime.h
View File

@ -33,10 +33,10 @@ typedef u64 cputime64_t;
/*
* Convert cputime to milliseconds and back.
* Convert cputime to microseconds and back.
*/
#define cputime_to_msecs(__ct) jiffies_to_msecs(__ct)
#define msecs_to_cputime(__msecs) msecs_to_jiffies(__msecs)
#define cputime_to_usecs(__ct) jiffies_to_usecs(__ct);
#define usecs_to_cputime(__msecs) usecs_to_jiffies(__msecs);
/*
* Convert cputime to seconds and back.

10
kernel/tsacct.c
View File

@ -63,12 +63,10 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
stats->ac_ppid = pid_alive(tsk) ?
rcu_dereference(tsk->real_parent)->tgid : 0;
rcu_read_unlock();
stats->ac_utime = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC;
stats->ac_stime = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;
stats->ac_utimescaled =
cputime_to_msecs(tsk->utimescaled) * USEC_PER_MSEC;
stats->ac_stimescaled =
cputime_to_msecs(tsk->stimescaled) * USEC_PER_MSEC;
stats->ac_utime = cputime_to_usecs(tsk->utime);
stats->ac_stime = cputime_to_usecs(tsk->stime);
stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled);
stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled);
stats->ac_minflt = tsk->min_flt;
stats->ac_majflt = tsk->maj_flt;