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[PATCH] Uninline jiffies.h functions
There are loads of fat functions hidden in jiffies.h. Uninline them. No code changes. [jeremy@goop.org: export fix] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: john stultz <johnstul@us.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ingo Molnar
Linus Torvalds
parent
f4304ab215
commit
8b9365d753
2 changed files with 229 additions and 200 deletions
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@ -259,207 +259,23 @@ static inline u64 get_jiffies_64(void)
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#endif
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/*
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* Convert jiffies to milliseconds and back.
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*
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* Avoid unnecessary multiplications/divisions in the
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* two most common HZ cases:
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* Convert various time units to each other:
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*/
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static inline unsigned int jiffies_to_msecs(const unsigned long j)
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{
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#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
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return (MSEC_PER_SEC / HZ) * j;
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#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
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return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
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#else
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return (j * MSEC_PER_SEC) / HZ;
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#endif
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}
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extern unsigned int jiffies_to_msecs(const unsigned long j);
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extern unsigned int jiffies_to_usecs(const unsigned long j);
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extern unsigned long msecs_to_jiffies(const unsigned int m);
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extern unsigned long usecs_to_jiffies(const unsigned int u);
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extern unsigned long timespec_to_jiffies(const struct timespec *value);
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extern void jiffies_to_timespec(const unsigned long jiffies,
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struct timespec *value);
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extern unsigned long timeval_to_jiffies(const struct timeval *value);
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extern void jiffies_to_timeval(const unsigned long jiffies,
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struct timeval *value);
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extern clock_t jiffies_to_clock_t(long x);
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extern unsigned long clock_t_to_jiffies(unsigned long x);
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extern u64 jiffies_64_to_clock_t(u64 x);
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extern u64 nsec_to_clock_t(u64 x);
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static inline unsigned int jiffies_to_usecs(const unsigned long j)
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{
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#if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
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return (USEC_PER_SEC / HZ) * j;
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#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
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return (j + (HZ / USEC_PER_SEC) - 1)/(HZ / USEC_PER_SEC);
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#else
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return (j * USEC_PER_SEC) / HZ;
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#endif
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}
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static inline unsigned long msecs_to_jiffies(const unsigned int m)
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{
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if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
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return MAX_JIFFY_OFFSET;
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#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
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return (m + (MSEC_PER_SEC / HZ) - 1) / (MSEC_PER_SEC / HZ);
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#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
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return m * (HZ / MSEC_PER_SEC);
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#else
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return (m * HZ + MSEC_PER_SEC - 1) / MSEC_PER_SEC;
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#endif
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}
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static inline unsigned long usecs_to_jiffies(const unsigned int u)
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{
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if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET))
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return MAX_JIFFY_OFFSET;
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#if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
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return (u + (USEC_PER_SEC / HZ) - 1) / (USEC_PER_SEC / HZ);
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#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
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return u * (HZ / USEC_PER_SEC);
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#else
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return (u * HZ + USEC_PER_SEC - 1) / USEC_PER_SEC;
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#endif
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}
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/*
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* The TICK_NSEC - 1 rounds up the value to the next resolution. Note
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* that a remainder subtract here would not do the right thing as the
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* resolution values don't fall on second boundries. I.e. the line:
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* nsec -= nsec % TICK_NSEC; is NOT a correct resolution rounding.
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*
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* Rather, we just shift the bits off the right.
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*
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* The >> (NSEC_JIFFIE_SC - SEC_JIFFIE_SC) converts the scaled nsec
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* value to a scaled second value.
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*/
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static __inline__ unsigned long
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timespec_to_jiffies(const struct timespec *value)
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{
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unsigned long sec = value->tv_sec;
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long nsec = value->tv_nsec + TICK_NSEC - 1;
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if (sec >= MAX_SEC_IN_JIFFIES){
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sec = MAX_SEC_IN_JIFFIES;
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nsec = 0;
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}
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return (((u64)sec * SEC_CONVERSION) +
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(((u64)nsec * NSEC_CONVERSION) >>
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(NSEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;
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}
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static __inline__ void
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jiffies_to_timespec(const unsigned long jiffies, struct timespec *value)
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{
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/*
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* Convert jiffies to nanoseconds and separate with
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* one divide.
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*/
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u64 nsec = (u64)jiffies * TICK_NSEC;
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value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &value->tv_nsec);
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}
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/* Same for "timeval"
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*
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* Well, almost. The problem here is that the real system resolution is
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* in nanoseconds and the value being converted is in micro seconds.
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* Also for some machines (those that use HZ = 1024, in-particular),
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* there is a LARGE error in the tick size in microseconds.
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* The solution we use is to do the rounding AFTER we convert the
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* microsecond part. Thus the USEC_ROUND, the bits to be shifted off.
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* Instruction wise, this should cost only an additional add with carry
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* instruction above the way it was done above.
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*/
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static __inline__ unsigned long
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timeval_to_jiffies(const struct timeval *value)
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{
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unsigned long sec = value->tv_sec;
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long usec = value->tv_usec;
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if (sec >= MAX_SEC_IN_JIFFIES){
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sec = MAX_SEC_IN_JIFFIES;
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usec = 0;
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}
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return (((u64)sec * SEC_CONVERSION) +
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(((u64)usec * USEC_CONVERSION + USEC_ROUND) >>
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(USEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;
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}
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static __inline__ void
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jiffies_to_timeval(const unsigned long jiffies, struct timeval *value)
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{
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/*
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* Convert jiffies to nanoseconds and separate with
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* one divide.
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*/
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u64 nsec = (u64)jiffies * TICK_NSEC;
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long tv_usec;
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value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &tv_usec);
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tv_usec /= NSEC_PER_USEC;
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value->tv_usec = tv_usec;
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}
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/*
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* Convert jiffies/jiffies_64 to clock_t and back.
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*/
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static inline clock_t jiffies_to_clock_t(long x)
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{
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#if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
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return x / (HZ / USER_HZ);
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#else
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u64 tmp = (u64)x * TICK_NSEC;
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do_div(tmp, (NSEC_PER_SEC / USER_HZ));
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return (long)tmp;
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#endif
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}
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static inline unsigned long clock_t_to_jiffies(unsigned long x)
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{
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#if (HZ % USER_HZ)==0
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if (x >= ~0UL / (HZ / USER_HZ))
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return ~0UL;
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return x * (HZ / USER_HZ);
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#else
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u64 jif;
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/* Don't worry about loss of precision here .. */
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if (x >= ~0UL / HZ * USER_HZ)
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return ~0UL;
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/* .. but do try to contain it here */
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jif = x * (u64) HZ;
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do_div(jif, USER_HZ);
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return jif;
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#endif
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}
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static inline u64 jiffies_64_to_clock_t(u64 x)
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{
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#if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
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do_div(x, HZ / USER_HZ);
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#else
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/*
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* There are better ways that don't overflow early,
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* but even this doesn't overflow in hundreds of years
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* in 64 bits, so..
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*/
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x *= TICK_NSEC;
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do_div(x, (NSEC_PER_SEC / USER_HZ));
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#endif
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return x;
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}
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static inline u64 nsec_to_clock_t(u64 x)
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{
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#if (NSEC_PER_SEC % USER_HZ) == 0
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do_div(x, (NSEC_PER_SEC / USER_HZ));
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#elif (USER_HZ % 512) == 0
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x *= USER_HZ/512;
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do_div(x, (NSEC_PER_SEC / 512));
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#else
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/*
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* max relative error 5.7e-8 (1.8s per year) for USER_HZ <= 1024,
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* overflow after 64.99 years.
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* exact for HZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
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*/
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x *= 9;
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do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (USER_HZ/2))
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/ USER_HZ));
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#endif
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return x;
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}
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#define TIMESTAMP_SIZE 30
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#endif
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213
kernel/time.c
213
kernel/time.c
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@ -470,6 +470,219 @@ struct timeval ns_to_timeval(const s64 nsec)
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return tv;
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}
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/*
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* Convert jiffies to milliseconds and back.
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*
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* Avoid unnecessary multiplications/divisions in the
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* two most common HZ cases:
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*/
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unsigned int jiffies_to_msecs(const unsigned long j)
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{
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#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
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return (MSEC_PER_SEC / HZ) * j;
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#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
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return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
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#else
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return (j * MSEC_PER_SEC) / HZ;
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#endif
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}
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EXPORT_SYMBOL(jiffies_to_msecs);
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unsigned int jiffies_to_usecs(const unsigned long j)
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{
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#if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
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return (USEC_PER_SEC / HZ) * j;
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#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
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return (j + (HZ / USEC_PER_SEC) - 1)/(HZ / USEC_PER_SEC);
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#else
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return (j * USEC_PER_SEC) / HZ;
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#endif
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}
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EXPORT_SYMBOL(jiffies_to_usecs);
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unsigned long msecs_to_jiffies(const unsigned int m)
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{
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if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
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return MAX_JIFFY_OFFSET;
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#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
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return (m + (MSEC_PER_SEC / HZ) - 1) / (MSEC_PER_SEC / HZ);
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#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
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return m * (HZ / MSEC_PER_SEC);
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#else
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return (m * HZ + MSEC_PER_SEC - 1) / MSEC_PER_SEC;
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#endif
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}
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EXPORT_SYMBOL(msecs_to_jiffies);
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unsigned long usecs_to_jiffies(const unsigned int u)
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{
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if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET))
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return MAX_JIFFY_OFFSET;
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#if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
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return (u + (USEC_PER_SEC / HZ) - 1) / (USEC_PER_SEC / HZ);
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#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
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return u * (HZ / USEC_PER_SEC);
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#else
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return (u * HZ + USEC_PER_SEC - 1) / USEC_PER_SEC;
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#endif
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}
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EXPORT_SYMBOL(usecs_to_jiffies);
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/*
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* The TICK_NSEC - 1 rounds up the value to the next resolution. Note
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* that a remainder subtract here would not do the right thing as the
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* resolution values don't fall on second boundries. I.e. the line:
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* nsec -= nsec % TICK_NSEC; is NOT a correct resolution rounding.
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*
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* Rather, we just shift the bits off the right.
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*
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* The >> (NSEC_JIFFIE_SC - SEC_JIFFIE_SC) converts the scaled nsec
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* value to a scaled second value.
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*/
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unsigned long
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timespec_to_jiffies(const struct timespec *value)
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{
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unsigned long sec = value->tv_sec;
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long nsec = value->tv_nsec + TICK_NSEC - 1;
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if (sec >= MAX_SEC_IN_JIFFIES){
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sec = MAX_SEC_IN_JIFFIES;
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nsec = 0;
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}
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return (((u64)sec * SEC_CONVERSION) +
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(((u64)nsec * NSEC_CONVERSION) >>
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(NSEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;
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}
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EXPORT_SYMBOL(timespec_to_jiffies);
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void
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jiffies_to_timespec(const unsigned long jiffies, struct timespec *value)
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{
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/*
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* Convert jiffies to nanoseconds and separate with
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* one divide.
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*/
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u64 nsec = (u64)jiffies * TICK_NSEC;
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value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &value->tv_nsec);
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}
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EXPORT_SYMBOL(jiffies_to_timespec);
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/* Same for "timeval"
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*
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* Well, almost. The problem here is that the real system resolution is
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* in nanoseconds and the value being converted is in micro seconds.
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* Also for some machines (those that use HZ = 1024, in-particular),
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* there is a LARGE error in the tick size in microseconds.
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* The solution we use is to do the rounding AFTER we convert the
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* microsecond part. Thus the USEC_ROUND, the bits to be shifted off.
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* Instruction wise, this should cost only an additional add with carry
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* instruction above the way it was done above.
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*/
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unsigned long
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timeval_to_jiffies(const struct timeval *value)
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{
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unsigned long sec = value->tv_sec;
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long usec = value->tv_usec;
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if (sec >= MAX_SEC_IN_JIFFIES){
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sec = MAX_SEC_IN_JIFFIES;
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usec = 0;
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}
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return (((u64)sec * SEC_CONVERSION) +
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(((u64)usec * USEC_CONVERSION + USEC_ROUND) >>
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(USEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;
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}
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void jiffies_to_timeval(const unsigned long jiffies, struct timeval *value)
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{
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/*
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* Convert jiffies to nanoseconds and separate with
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* one divide.
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*/
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u64 nsec = (u64)jiffies * TICK_NSEC;
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long tv_usec;
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value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &tv_usec);
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tv_usec /= NSEC_PER_USEC;
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value->tv_usec = tv_usec;
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}
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/*
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* Convert jiffies/jiffies_64 to clock_t and back.
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*/
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clock_t jiffies_to_clock_t(long x)
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{
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#if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
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return x / (HZ / USER_HZ);
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#else
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u64 tmp = (u64)x * TICK_NSEC;
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do_div(tmp, (NSEC_PER_SEC / USER_HZ));
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return (long)tmp;
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#endif
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}
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EXPORT_SYMBOL(jiffies_to_clock_t);
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unsigned long clock_t_to_jiffies(unsigned long x)
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{
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#if (HZ % USER_HZ)==0
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if (x >= ~0UL / (HZ / USER_HZ))
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return ~0UL;
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return x * (HZ / USER_HZ);
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#else
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u64 jif;
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/* Don't worry about loss of precision here .. */
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if (x >= ~0UL / HZ * USER_HZ)
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return ~0UL;
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/* .. but do try to contain it here */
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jif = x * (u64) HZ;
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do_div(jif, USER_HZ);
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return jif;
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#endif
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}
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EXPORT_SYMBOL(clock_t_to_jiffies);
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u64 jiffies_64_to_clock_t(u64 x)
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{
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#if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
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do_div(x, HZ / USER_HZ);
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#else
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/*
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* There are better ways that don't overflow early,
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* but even this doesn't overflow in hundreds of years
|
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* in 64 bits, so..
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*/
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x *= TICK_NSEC;
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do_div(x, (NSEC_PER_SEC / USER_HZ));
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#endif
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return x;
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}
|
||||
|
||||
EXPORT_SYMBOL(jiffies_64_to_clock_t);
|
||||
|
||||
u64 nsec_to_clock_t(u64 x)
|
||||
{
|
||||
#if (NSEC_PER_SEC % USER_HZ) == 0
|
||||
do_div(x, (NSEC_PER_SEC / USER_HZ));
|
||||
#elif (USER_HZ % 512) == 0
|
||||
x *= USER_HZ/512;
|
||||
do_div(x, (NSEC_PER_SEC / 512));
|
||||
#else
|
||||
/*
|
||||
* max relative error 5.7e-8 (1.8s per year) for USER_HZ <= 1024,
|
||||
* overflow after 64.99 years.
|
||||
* exact for HZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
|
||||
*/
|
||||
x *= 9;
|
||||
do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (USER_HZ/2)) /
|
||||
USER_HZ));
|
||||
#endif
|
||||
return x;
|
||||
}
|
||||
|
||||
#if (BITS_PER_LONG < 64)
|
||||
u64 get_jiffies_64(void)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in a new issue