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author | Michael Neuling <mikey@neuling.org> | 2008-02-06 01:36:12 -0800 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-06 10:41:00 -0800 |
commit | 06b8e878a9bc9301201cffe186eba99c4185f20a (patch) | |
tree | 857434ed559cdb001177e81283be6f0b5693a781 | |
parent | d9afa43532adf8a31b93c4c7601fda3f423d8972 (diff) | |
download | kernel_samsung_tuna-06b8e878a9bc9301201cffe186eba99c4185f20a.zip kernel_samsung_tuna-06b8e878a9bc9301201cffe186eba99c4185f20a.tar.gz kernel_samsung_tuna-06b8e878a9bc9301201cffe186eba99c4185f20a.tar.bz2 |
taskstats scaled time cleanup
This moves the ability to scale cputime into generic code. This allows us
to fix the issue in kernel/timer.c (noticed by Balbir) where we could only
add an unscaled value to the scaled utime/stime.
This adds a cputime_to_scaled function. As before, the POWERPC version
does the scaling based on the last SPURR/PURR ratio calculated. The
generic and s390 (only other arch to implement asm/cputime.h) versions are
both NOPs.
Also moves the SPURR and PURR snapshots closer.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Cc: Jay Lan <jlan@engr.sgi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | arch/powerpc/kernel/time.c | 12 | ||||
-rw-r--r-- | include/asm-generic/cputime.h | 1 | ||||
-rw-r--r-- | include/asm-powerpc/cputime.h | 14 | ||||
-rw-r--r-- | include/asm-powerpc/paca.h | 2 | ||||
-rw-r--r-- | include/asm-s390/cputime.h | 1 | ||||
-rw-r--r-- | kernel/timer.c | 10 |
6 files changed, 28 insertions, 12 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 5cd3db5..3b26fbd6 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -66,6 +66,7 @@ #include <asm/smp.h> #include <asm/vdso_datapage.h> #include <asm/firmware.h> +#include <asm/cputime.h> #ifdef CONFIG_PPC_ISERIES #include <asm/iseries/it_lp_queue.h> #include <asm/iseries/hv_call_xm.h> @@ -189,6 +190,8 @@ u64 __cputime_sec_factor; EXPORT_SYMBOL(__cputime_sec_factor); u64 __cputime_clockt_factor; EXPORT_SYMBOL(__cputime_clockt_factor); +DEFINE_PER_CPU(unsigned long, cputime_last_delta); +DEFINE_PER_CPU(unsigned long, cputime_scaled_last_delta); static void calc_cputime_factors(void) { @@ -257,8 +260,8 @@ void account_system_vtime(struct task_struct *tsk) } account_system_time(tsk, 0, delta); account_system_time_scaled(tsk, deltascaled); - get_paca()->purrdelta = delta; - get_paca()->spurrdelta = deltascaled; + per_cpu(cputime_last_delta, smp_processor_id()) = delta; + per_cpu(cputime_scaled_last_delta, smp_processor_id()) = deltascaled; local_irq_restore(flags); } @@ -276,10 +279,7 @@ void account_process_tick(struct task_struct *tsk, int user_tick) get_paca()->user_time = 0; account_user_time(tsk, utime); - /* Estimate the scaled utime by scaling the real utime based - * on the last spurr to purr ratio */ - utimescaled = utime * get_paca()->spurrdelta / get_paca()->purrdelta; - get_paca()->spurrdelta = get_paca()->purrdelta = 0; + utimescaled = cputime_to_scaled(utime); account_user_time_scaled(tsk, utimescaled); } diff --git a/include/asm-generic/cputime.h b/include/asm-generic/cputime.h index 09204e4..1c1fa42 100644 --- a/include/asm-generic/cputime.h +++ b/include/asm-generic/cputime.h @@ -18,6 +18,7 @@ typedef unsigned long cputime_t; #define cputime_lt(__a, __b) ((__a) < (__b)) #define cputime_le(__a, __b) ((__a) <= (__b)) #define cputime_to_jiffies(__ct) (__ct) +#define cputime_to_scaled(__ct) (__ct) #define jiffies_to_cputime(__hz) (__hz) typedef u64 cputime64_t; diff --git a/include/asm-powerpc/cputime.h b/include/asm-powerpc/cputime.h index 3108044..f42e623 100644 --- a/include/asm-powerpc/cputime.h +++ b/include/asm-powerpc/cputime.h @@ -52,12 +52,26 @@ typedef u64 cputime64_t; * Convert cputime <-> jiffies */ extern u64 __cputime_jiffies_factor; +DECLARE_PER_CPU(unsigned long, cputime_last_delta); +DECLARE_PER_CPU(unsigned long, cputime_scaled_last_delta); static inline unsigned long cputime_to_jiffies(const cputime_t ct) { return mulhdu(ct, __cputime_jiffies_factor); } +/* Estimate the scaled cputime by scaling the real cputime based on + * the last scaled to real ratio */ +static inline cputime_t cputime_to_scaled(const cputime_t ct) +{ + if (cpu_has_feature(CPU_FTR_SPURR) && + per_cpu(cputime_last_delta, smp_processor_id())) + return ct * + per_cpu(cputime_scaled_last_delta, smp_processor_id())/ + per_cpu(cputime_last_delta, smp_processor_id()); + return ct; +} + static inline cputime_t jiffies_to_cputime(const unsigned long jif) { cputime_t ct; diff --git a/include/asm-powerpc/paca.h b/include/asm-powerpc/paca.h index f6dfce0..748b35a 100644 --- a/include/asm-powerpc/paca.h +++ b/include/asm-powerpc/paca.h @@ -115,8 +115,6 @@ struct paca_struct { u64 system_time; /* accumulated system TB ticks */ u64 startpurr; /* PURR/TB value snapshot */ u64 startspurr; /* SPURR value snapshot */ - u64 purrdelta; /* FIXME: document */ - u64 spurrdelta; /* FIXME: document */ }; extern struct paca_struct paca[]; diff --git a/include/asm-s390/cputime.h b/include/asm-s390/cputime.h index 4b3ef7c..133ce05 100644 --- a/include/asm-s390/cputime.h +++ b/include/asm-s390/cputime.h @@ -54,6 +54,7 @@ __div(unsigned long long n, unsigned int base) #define cputime_lt(__a, __b) ((__a) < (__b)) #define cputime_le(__a, __b) ((__a) <= (__b)) #define cputime_to_jiffies(__ct) (__div((__ct), 1000000 / HZ)) +#define cputime_to_scaled(__ct) (__ct) #define jiffies_to_cputime(__hz) ((cputime_t)(__hz) * (1000000 / HZ)) #define cputime64_zero (0ULL) diff --git a/kernel/timer.c b/kernel/timer.c index 9fbb472..70b29b5 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -818,12 +818,14 @@ unsigned long next_timer_interrupt(void) #ifndef CONFIG_VIRT_CPU_ACCOUNTING void account_process_tick(struct task_struct *p, int user_tick) { + cputime_t one_jiffy = jiffies_to_cputime(1); + if (user_tick) { - account_user_time(p, jiffies_to_cputime(1)); - account_user_time_scaled(p, jiffies_to_cputime(1)); + account_user_time(p, one_jiffy); + account_user_time_scaled(p, cputime_to_scaled(one_jiffy)); } else { - account_system_time(p, HARDIRQ_OFFSET, jiffies_to_cputime(1)); - account_system_time_scaled(p, jiffies_to_cputime(1)); + account_system_time(p, HARDIRQ_OFFSET, one_jiffy); + account_system_time_scaled(p, cputime_to_scaled(one_jiffy)); } } #endif |