diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2007-10-22 12:52:39 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-10-22 12:52:47 +0200 |
| commit | fae8b22d3e3e3a3d317a7746493997af02a3f35c (patch) | |
| tree | 871aa91c51d713d7842ba1eb8661bde54d102842 /arch/s390/kernel/process.c | |
| parent | 32346f47dd46bed291464e194a6c47da6fdd1bc3 (diff) | |
[S390] Add per-cpu idle time / idle count sysfs attributes.
Add two new sysfs entries per cpu: idle_count and idle_time.
idle_count contains the number of times a cpu went into idle state.
idle_time contains the time a cpu spent in idle state in microseconds.
This can be used e.g. by powertop to tell how often idle state is
entered and left.
# cat /sys/devices/system/cpu/cpu0/idle_count
504
# cat /sys/devices/system/cpu/cpu0/idle_time
469734037 us
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/process.c')
| -rw-r--r-- | arch/s390/kernel/process.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index 70c57378f42..cc7c4ba0774 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -44,6 +44,7 @@ #include <asm/processor.h> #include <asm/irq.h> #include <asm/timer.h> +#include <asm/cpu.h> asmlinkage void ret_from_fork(void) asm ("ret_from_fork"); @@ -91,6 +92,14 @@ EXPORT_SYMBOL(unregister_idle_notifier); void do_monitor_call(struct pt_regs *regs, long interruption_code) { + struct s390_idle_data *idle; + + idle = &__get_cpu_var(s390_idle); + spin_lock(&idle->lock); + idle->idle_time += get_clock() - idle->idle_enter; + idle->in_idle = 0; + spin_unlock(&idle->lock); + /* disable monitor call class 0 */ __ctl_clear_bit(8, 15); @@ -105,6 +114,7 @@ extern void s390_handle_mcck(void); static void default_idle(void) { int cpu, rc; + struct s390_idle_data *idle; /* CPU is going idle. */ cpu = smp_processor_id(); @@ -142,6 +152,12 @@ static void default_idle(void) return; } + idle = &__get_cpu_var(s390_idle); + spin_lock(&idle->lock); + idle->idle_count++; + idle->in_idle = 1; + idle->idle_enter = get_clock(); + spin_unlock(&idle->lock); trace_hardirqs_on(); /* Wait for external, I/O or machine check interrupt. */ __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT | |