diff options
| author | Mike Galbraith <efault@gmx.de> | 2009-01-23 10:13:01 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-23 11:33:18 +0100 |
| commit | 1b023a96d9b44f50f4d8ff28c15f5b80e354760f (patch) | |
| tree | 8b6a5956c4461c13c2e2b3769096afac5b767524 /include | |
| parent | Merge branch 'core/percpu' into perfcounters/core (diff) | |
| download | linux-1b023a96d9b44f50f4d8ff28c15f5b80e354760f.tar.xz linux-1b023a96d9b44f50f4d8ff28c15f5b80e354760f.zip | |
perfcounters: throttle on too high IRQ rates
Starting kerneltop with only -c 100 seems to be a bad idea, it can
easily lock the system due to perfcounter IRQ overload.
So add throttling: if a new IRQ arrives in a shorter than
PERFMON_MIN_PERIOD_NS time, turn off perfcounters and untrottle them
from the next timer tick.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/perf_counter.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index 33ba9fe0a781..91f1ca4c01c0 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -254,6 +254,7 @@ extern void perf_counter_init_task(struct task_struct *child); extern void perf_counter_exit_task(struct task_struct *child); extern void perf_counter_notify(struct pt_regs *regs); extern void perf_counter_print_debug(void); +extern void perf_counter_unthrottle(void); extern u64 hw_perf_save_disable(void); extern void hw_perf_restore(u64 ctrl); extern int perf_counter_task_disable(void); @@ -270,6 +271,8 @@ static inline int is_software_counter(struct perf_counter *counter) return !counter->hw_event.raw && counter->hw_event.type < 0; } +#define PERFMON_MIN_PERIOD_NS 10000 + #else static inline void perf_counter_task_sched_in(struct task_struct *task, int cpu) { } @@ -281,6 +284,7 @@ static inline void perf_counter_init_task(struct task_struct *child) { } static inline void perf_counter_exit_task(struct task_struct *child) { } static inline void perf_counter_notify(struct pt_regs *regs) { } static inline void perf_counter_print_debug(void) { } +static inline void perf_counter_unthrottle(void) { } static inline void hw_perf_restore(u64 ctrl) { } static inline u64 hw_perf_save_disable(void) { return 0; } static inline int perf_counter_task_disable(void) { return -EINVAL; } |