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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2010-10-28 02:34:45 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-28 05:03:17 +0400
commitd57af9b2142f31a39dcfdeb30776baadfc802827 (patch)
treea89233b1e57b152c9bebf7bb516dd51920602969 /arch/powerpc
parent3d9e0cf1fe007b88db55d43dfdb6839e1a029ca5 (diff)
downloadlinux-d57af9b2142f31a39dcfdeb30776baadfc802827.tar.xz
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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/include/asm/cputime.h12
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/powerpc/include/asm/cputime.h b/arch/powerpc/include/asm/cputime.h
index 8bdc6a9e5773..1cf20bdfbeca 100644
--- a/arch/powerpc/include/asm/cputime.h
+++ b/arch/powerpc/include/asm/cputime.h
@@ -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);