mirror of https://gitee.com/openkylin/linux.git
powerpc: Fix wrong divisor in usecs_to_cputime
Commit d57af9b
(taskstats: use real microsecond granularity for CPU times)
renamed msecs_to_cputime to usecs_to_cputime, but failed to update all
numbers on the way. This causes nonsensical cpu idle/iowait values to be
displayed in /proc/stat (the only user of usecs_to_cputime so far).
This also renames __cputime_msec_factor to __cputime_usec_factor, adapting
its value and using it directly in cputime_to_usecs instead of doing two
multiplications.
Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Acked-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
parent
2011b1d0d3
commit
9f5072d4f6
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@ -126,11 +126,11 @@ static inline u64 cputime64_to_jiffies64(const cputime_t ct)
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/*
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* Convert cputime <-> microseconds
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*/
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extern u64 __cputime_msec_factor;
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extern u64 __cputime_usec_factor;
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static inline unsigned long cputime_to_usecs(const cputime_t ct)
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{
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return mulhdu(ct, __cputime_msec_factor) * USEC_PER_MSEC;
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return mulhdu(ct, __cputime_usec_factor);
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}
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static inline cputime_t usecs_to_cputime(const unsigned long us)
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@ -143,7 +143,7 @@ static inline cputime_t usecs_to_cputime(const unsigned long us)
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sec = us / 1000000;
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if (ct) {
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ct *= tb_ticks_per_sec;
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do_div(ct, 1000);
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do_div(ct, 1000000);
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}
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if (sec)
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ct += (cputime_t) sec * tb_ticks_per_sec;
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@ -158,13 +158,13 @@ EXPORT_SYMBOL_GPL(ppc_tb_freq);
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING
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/*
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* Factors for converting from cputime_t (timebase ticks) to
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* jiffies, milliseconds, seconds, and clock_t (1/USER_HZ seconds).
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* jiffies, microseconds, seconds, and clock_t (1/USER_HZ seconds).
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* These are all stored as 0.64 fixed-point binary fractions.
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*/
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u64 __cputime_jiffies_factor;
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EXPORT_SYMBOL(__cputime_jiffies_factor);
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u64 __cputime_msec_factor;
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EXPORT_SYMBOL(__cputime_msec_factor);
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u64 __cputime_usec_factor;
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EXPORT_SYMBOL(__cputime_usec_factor);
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u64 __cputime_sec_factor;
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EXPORT_SYMBOL(__cputime_sec_factor);
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u64 __cputime_clockt_factor;
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@ -182,8 +182,8 @@ static void calc_cputime_factors(void)
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div128_by_32(HZ, 0, tb_ticks_per_sec, &res);
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__cputime_jiffies_factor = res.result_low;
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div128_by_32(1000, 0, tb_ticks_per_sec, &res);
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__cputime_msec_factor = res.result_low;
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div128_by_32(1000000, 0, tb_ticks_per_sec, &res);
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__cputime_usec_factor = res.result_low;
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div128_by_32(1, 0, tb_ticks_per_sec, &res);
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__cputime_sec_factor = res.result_low;
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div128_by_32(USER_HZ, 0, tb_ticks_per_sec, &res);
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