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time: Add nsecs_to_cputime64 interface for asm-generic

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Add nsecs_to_cputime64 interface. This is used in following patches that
updates cpu irq stat based on ns granularity info in IRQ_TIME_ACCOUNTING.

Tested-by: Shaun Ruffell <sruffell@digium.com>
Signed-off-by: Venkatesh Pallipadi <venki@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1292980144-28796-3-git-send-email-venki@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Venkatesh Pallipadi 2010-12-21 17:09:01 -08:00 committed by Ingo Molnar
parent 4dd53d891c
commit a1dabb6bff
3 changed files with 25 additions and 2 deletions
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3
include/asm-generic/cputime.h
View File

@ -30,6 +30,9 @@ typedef u64 cputime64_t;
#define cputime64_to_jiffies64(__ct) (__ct)
#define jiffies64_to_cputime64(__jif) (__jif)
#define cputime_to_cputime64(__ct) ((u64) __ct)
#define cputime64_gt(__a, __b) ((__a) > (__b))
#define nsecs_to_cputime64(__ct) nsecs_to_jiffies64(__ct)
/*

1
include/linux/jiffies.h
View File

@ -307,6 +307,7 @@ extern clock_t jiffies_to_clock_t(long x);
extern unsigned long clock_t_to_jiffies(unsigned long x);
extern u64 jiffies_64_to_clock_t(u64 x);
extern u64 nsec_to_clock_t(u64 x);
extern u64 nsecs_to_jiffies64(u64 n);
extern unsigned long nsecs_to_jiffies(u64 n);
#define TIMESTAMP_SIZE 30

23
kernel/time.c
View File

@ -645,7 +645,7 @@ u64 nsec_to_clock_t(u64 x)
}
/**
* nsecs_to_jiffies - Convert nsecs in u64 to jiffies
* nsecs_to_jiffies64 - Convert nsecs in u64 to jiffies64
*
* @n: nsecs in u64
*
@ -657,7 +657,7 @@ u64 nsec_to_clock_t(u64 x)
* NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512)
* ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years
*/
unsigned long nsecs_to_jiffies(u64 n)
u64 nsecs_to_jiffies64(u64 n)
{
#if (NSEC_PER_SEC % HZ) == 0
/* Common case, HZ = 100, 128, 200, 250, 256, 500, 512, 1000 etc. */
@ -674,6 +674,25 @@ unsigned long nsecs_to_jiffies(u64 n)
#endif
}
/**
* nsecs_to_jiffies - Convert nsecs in u64 to jiffies
*
* @n: nsecs in u64
*
* Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64.
* And this doesn't return MAX_JIFFY_OFFSET since this function is designed
* for scheduler, not for use in device drivers to calculate timeout value.
*
* note:
* NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512)
* ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years
*/
unsigned long nsecs_to_jiffies(u64 n)
{
return (unsigned long)nsecs_to_jiffies64(n);
}
#if (BITS_PER_LONG < 64)
u64 get_jiffies_64(void)
{