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perf counters: implement PERF_COUNT_CPU_CLOCK

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Impact: add new perf-counter type

The 'CPU clock' counter counts the amount of CPU clock time that is
elapsing, in nanoseconds. (regardless of how much of it the task is
spending on a CPU executing)

This counter type is a Linux kernel based abstraction, it is available
even if the hardware does not support native hardware performance counters.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2008-12-11 13:21:10 +01:00
parent 621a01eac8
commit 5c92d12411
3 changed files with 92 additions and 48 deletions
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9
include/linux/perf_counter.h
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@@ -131,7 +131,7 @@ struct perf_counter {
struct list_head list_entry;
struct list_head sibling_list;
struct perf_counter *group_leader;
struct hw_perf_counter_ops *hw_ops;
const struct hw_perf_counter_ops *hw_ops;
int active;
#if BITS_PER_LONG == 64
@@ -197,7 +197,7 @@ struct perf_cpu_context {
extern int perf_max_counters;
#ifdef CONFIG_PERF_COUNTERS
extern struct hw_perf_counter_ops *
extern const struct hw_perf_counter_ops *
hw_perf_counter_init(struct perf_counter *counter);
extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
@@ -208,6 +208,9 @@ extern void perf_counter_notify(struct pt_regs *regs);
extern void perf_counter_print_debug(void);
extern void hw_perf_restore_ctrl(u64 ctrl);
extern u64 hw_perf_disable_all(void);
extern void atomic64_counter_set(struct perf_counter *counter, u64 val64);
extern u64 atomic64_counter_read(struct perf_counter *counter);
#else
static inline void
perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
@@ -219,7 +222,7 @@ static inline void perf_counter_init_task(struct task_struct *task) { }
static inline void perf_counter_notify(struct pt_regs *regs) { }
static inline void perf_counter_print_debug(void) { }
static inline void hw_perf_restore_ctrl(u64 ctrl) { }
static inline u64 hw_perf_disable_all(void) { return 0; }
static inline u64 hw_perf_disable_all(void) { return 0; }
#endif
#endif /* _LINUX_PERF_COUNTER_H */