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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-03-11 19:59:27 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-03-11 19:59:28 +0400 |
| commit | 4c1051e37a0e2a941115c6fb7ba08c318f25a0f9 (patch) | |
| tree | f228f1a90c0d7abb8308f275d0906dd7d1588ba3 /arch/s390/include | |
| parent | 8b646bd759086f6090fe27acf414c0b5faa737f4 (diff) | |
| download | linux-4c1051e37a0e2a941115c6fb7ba08c318f25a0f9.tar.xz | |
[S390] rework idle code
Whenever the cpu loads an enabled wait PSW it will appear as idle to the
underlying host system. The code in default_idle calls vtime_stop_cpu
which does the necessary voodoo to get the cpu time accounting right.
The udelay code just loads an enabled wait PSW. To correct this rework
the vtime_stop_cpu/vtime_start_cpu logic and move the difficult parts
to entry[64].S, vtime_stop_cpu can now be called from anywhere and
vtime_start_cpu is gone. The correction of the cpu time during wakeup
from an enabled wait PSW is done with a critical section in entry[64].S.
As vtime_start_cpu is gone, s390_idle_check can be removed as well.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/cputime.h | 9 | ||||
| -rw-r--r-- | arch/s390/include/asm/timer.h | 4 |
2 files changed, 3 insertions, 10 deletions
diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h index c23c3900c304..24ef186a1c4f 100644 --- a/arch/s390/include/asm/cputime.h +++ b/arch/s390/include/asm/cputime.h @@ -170,24 +170,17 @@ struct s390_idle_data { unsigned int sequence; unsigned long long idle_count; unsigned long long idle_enter; + unsigned long long idle_exit; unsigned long long idle_time; int nohz_delay; }; DECLARE_PER_CPU(struct s390_idle_data, s390_idle); -void vtime_start_cpu(__u64 int_clock, __u64 enter_timer); cputime64_t s390_get_idle_time(int cpu); #define arch_idle_time(cpu) s390_get_idle_time(cpu) -static inline void s390_idle_check(struct pt_regs *regs, __u64 int_clock, - __u64 enter_timer) -{ - if (regs->psw.mask & PSW_MASK_WAIT) - vtime_start_cpu(int_clock, enter_timer); -} - static inline int s390_nohz_delay(int cpu) { return __get_cpu_var(s390_idle).nohz_delay != 0; diff --git a/arch/s390/include/asm/timer.h b/arch/s390/include/asm/timer.h index 814243cafdfe..e63069ba39e3 100644 --- a/arch/s390/include/asm/timer.h +++ b/arch/s390/include/asm/timer.h @@ -33,8 +33,8 @@ struct vtimer_queue { spinlock_t lock; __u64 timer; /* last programmed timer */ __u64 elapsed; /* elapsed time of timer expire values */ - __u64 idle; /* temp var for idle */ - int do_spt; /* =1: reprogram cpu timer in idle */ + __u64 idle_enter; /* cpu timer on idle enter */ + __u64 idle_exit; /* cpu timer on idle exit */ }; extern void init_virt_timer(struct vtimer_list *timer); |