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cputime: Librarize per nsecs resolution cputime definitions
The full dynticks cputime accounting that we'll soon introduce will rely on sched_clock(). And its clock can have a per nanosecond granularity. To prepare for this, we need to have a cputime_t implementation that has this precision. ia64 virtual cputime accounting already uses that granularity so all we need is to librarize its implementation in the asm generic headers. Also librarize the default per jiffy granularity cputime_t as well so that we can easily pick either implementation depending on the cputime accounting config we choose. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com>
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Frederic Weisbecker
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Jan 27, 2013
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| #ifndef _ASM_GENERIC_CPUTIME_JIFFIES_H | ||
| #define _ASM_GENERIC_CPUTIME_JIFFIES_H | ||
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| typedef unsigned long __nocast cputime_t; | ||
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| #define cputime_one_jiffy jiffies_to_cputime(1) | ||
| #define cputime_to_jiffies(__ct) (__force unsigned long)(__ct) | ||
| #define cputime_to_scaled(__ct) (__ct) | ||
| #define jiffies_to_cputime(__hz) (__force cputime_t)(__hz) | ||
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| typedef u64 __nocast cputime64_t; | ||
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| #define cputime64_to_jiffies64(__ct) (__force u64)(__ct) | ||
| #define jiffies64_to_cputime64(__jif) (__force cputime64_t)(__jif) | ||
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| #define nsecs_to_cputime64(__ct) \ | ||
| jiffies64_to_cputime64(nsecs_to_jiffies64(__ct)) | ||
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| /* | ||
| * Convert cputime to microseconds and back. | ||
| */ | ||
| #define cputime_to_usecs(__ct) \ | ||
| jiffies_to_usecs(cputime_to_jiffies(__ct)) | ||
| #define usecs_to_cputime(__usec) \ | ||
| jiffies_to_cputime(usecs_to_jiffies(__usec)) | ||
| #define usecs_to_cputime64(__usec) \ | ||
| jiffies64_to_cputime64(nsecs_to_jiffies64((__usec) * 1000)) | ||
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| /* | ||
| * Convert cputime to seconds and back. | ||
| */ | ||
| #define cputime_to_secs(jif) (cputime_to_jiffies(jif) / HZ) | ||
| #define secs_to_cputime(sec) jiffies_to_cputime((sec) * HZ) | ||
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| /* | ||
| * Convert cputime to timespec and back. | ||
| */ | ||
| #define timespec_to_cputime(__val) \ | ||
| jiffies_to_cputime(timespec_to_jiffies(__val)) | ||
| #define cputime_to_timespec(__ct,__val) \ | ||
| jiffies_to_timespec(cputime_to_jiffies(__ct),__val) | ||
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| /* | ||
| * Convert cputime to timeval and back. | ||
| */ | ||
| #define timeval_to_cputime(__val) \ | ||
| jiffies_to_cputime(timeval_to_jiffies(__val)) | ||
| #define cputime_to_timeval(__ct,__val) \ | ||
| jiffies_to_timeval(cputime_to_jiffies(__ct),__val) | ||
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| /* | ||
| * Convert cputime to clock and back. | ||
| */ | ||
| #define cputime_to_clock_t(__ct) \ | ||
| jiffies_to_clock_t(cputime_to_jiffies(__ct)) | ||
| #define clock_t_to_cputime(__x) \ | ||
| jiffies_to_cputime(clock_t_to_jiffies(__x)) | ||
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| /* | ||
| * Convert cputime64 to clock. | ||
| */ | ||
| #define cputime64_to_clock_t(__ct) \ | ||
| jiffies_64_to_clock_t(cputime64_to_jiffies64(__ct)) | ||
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| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| /* | ||
| * Definitions for measuring cputime in nsecs resolution. | ||
| * | ||
| * Based on <arch/ia64/include/asm/cputime.h> | ||
| * | ||
| * Copyright (C) 2007 FUJITSU LIMITED | ||
| * Copyright (C) 2007 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License | ||
| * as published by the Free Software Foundation; either version | ||
| * 2 of the License, or (at your option) any later version. | ||
| * | ||
| */ | ||
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| #ifndef _ASM_GENERIC_CPUTIME_NSECS_H | ||
| #define _ASM_GENERIC_CPUTIME_NSECS_H | ||
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| typedef u64 __nocast cputime_t; | ||
| typedef u64 __nocast cputime64_t; | ||
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| #define cputime_one_jiffy jiffies_to_cputime(1) | ||
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| /* | ||
| * Convert cputime <-> jiffies (HZ) | ||
| */ | ||
| #define cputime_to_jiffies(__ct) \ | ||
| ((__force u64)(__ct) / (NSEC_PER_SEC / HZ)) | ||
| #define jiffies_to_cputime(__jif) \ | ||
| (__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ)) | ||
| #define cputime64_to_jiffies64(__ct) \ | ||
| ((__force u64)(__ct) / (NSEC_PER_SEC / HZ)) | ||
| #define jiffies64_to_cputime64(__jif) \ | ||
| (__force cputime64_t)((__jif) * (NSEC_PER_SEC / HZ)) | ||
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| /* | ||
| * Convert cputime <-> microseconds | ||
| */ | ||
| #define cputime_to_usecs(__ct) \ | ||
| ((__force u64)(__ct) / NSEC_PER_USEC) | ||
| #define usecs_to_cputime(__usecs) \ | ||
| (__force cputime_t)((__usecs) * NSEC_PER_USEC) | ||
| #define usecs_to_cputime64(__usecs) \ | ||
| (__force cputime64_t)((__usecs) * NSEC_PER_USEC) | ||
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| /* | ||
| * Convert cputime <-> seconds | ||
| */ | ||
| #define cputime_to_secs(__ct) \ | ||
| ((__force u64)(__ct) / NSEC_PER_SEC) | ||
| #define secs_to_cputime(__secs) \ | ||
| (__force cputime_t)((__secs) * NSEC_PER_SEC) | ||
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| /* | ||
| * Convert cputime <-> timespec (nsec) | ||
| */ | ||
| static inline cputime_t timespec_to_cputime(const struct timespec *val) | ||
| { | ||
| u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_nsec; | ||
| return (__force cputime_t) ret; | ||
| } | ||
| static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val) | ||
| { | ||
| val->tv_sec = (__force u64) ct / NSEC_PER_SEC; | ||
| val->tv_nsec = (__force u64) ct % NSEC_PER_SEC; | ||
| } | ||
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| /* | ||
| * Convert cputime <-> timeval (msec) | ||
| */ | ||
| static inline cputime_t timeval_to_cputime(struct timeval *val) | ||
| { | ||
| u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_usec * NSEC_PER_USEC; | ||
| return (__force cputime_t) ret; | ||
| } | ||
| static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val) | ||
| { | ||
| val->tv_sec = (__force u64) ct / NSEC_PER_SEC; | ||
| val->tv_usec = ((__force u64) ct % NSEC_PER_SEC) / NSEC_PER_USEC; | ||
| } | ||
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| /* | ||
| * Convert cputime <-> clock (USER_HZ) | ||
| */ | ||
| #define cputime_to_clock_t(__ct) \ | ||
| ((__force u64)(__ct) / (NSEC_PER_SEC / USER_HZ)) | ||
| #define clock_t_to_cputime(__x) \ | ||
| (__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ)) | ||
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| /* | ||
| * Convert cputime64 to clock. | ||
| */ | ||
| #define cputime64_to_clock_t(__ct) \ | ||
| cputime_to_clock_t((__force cputime_t)__ct) | ||
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| #endif |