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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2007-10-22 14:52:39 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-10-22 14:52:47 +0400 |
| commit | fae8b22d3e3e3a3d317a7746493997af02a3f35c (patch) | |
| tree | 871aa91c51d713d7842ba1eb8661bde54d102842 /include/asm-s390 | |
| parent | 32346f47dd46bed291464e194a6c47da6fdd1bc3 (diff) | |
| download | linux-fae8b22d3e3e3a3d317a7746493997af02a3f35c.tar.xz | |
[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 'include/asm-s390')
| -rw-r--r-- | include/asm-s390/cpu.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/asm-s390/cpu.h b/include/asm-s390/cpu.h new file mode 100644 index 000000000000..352dde194f3c --- /dev/null +++ b/include/asm-s390/cpu.h @@ -0,0 +1,25 @@ +/* + * include/asm-s390/cpu.h + * + * Copyright IBM Corp. 2007 + * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> + */ + +#ifndef _ASM_S390_CPU_H_ +#define _ASM_S390_CPU_H_ + +#include <linux/types.h> +#include <linux/percpu.h> +#include <linux/spinlock.h> + +struct s390_idle_data { + spinlock_t lock; + unsigned int in_idle; + unsigned long long idle_count; + unsigned long long idle_enter; + unsigned long long idle_time; +}; + +DECLARE_PER_CPU(struct s390_idle_data, s390_idle); + +#endif /* _ASM_S390_CPU_H_ */ |