Commit bae43c99 authored by Ingo Molnar's avatar Ingo Molnar

perf counters: implement PERF_COUNT_TASK_CLOCK

Impact: add new perf-counter type

The 'task clock' counter counts the amount of time a task is executing,
in nanoseconds. It stops ticking when a task is scheduled out either due
to it blocking, sleeping or it being preempted.

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: default avatarIngo Molnar <mingo@elte.hu>
parent 01b2838c
...@@ -50,8 +50,11 @@ enum hw_event_types { ...@@ -50,8 +50,11 @@ enum hw_event_types {
*/ */
PERF_COUNT_CPU_CLOCK = -1, PERF_COUNT_CPU_CLOCK = -1,
PERF_COUNT_TASK_CLOCK = -2, PERF_COUNT_TASK_CLOCK = -2,
PERF_COUNT_PAGE_FAULTS = -3, /*
PERF_COUNT_CONTEXT_SWITCHES = -4, * Future software events:
*/
/* PERF_COUNT_PAGE_FAULTS = -3,
PERF_COUNT_CONTEXT_SWITCHES = -4, */
}; };
/* /*
......
...@@ -855,6 +855,25 @@ static const struct hw_perf_counter_ops perf_ops_cpu_clock = { ...@@ -855,6 +855,25 @@ static const struct hw_perf_counter_ops perf_ops_cpu_clock = {
.hw_perf_counter_read = cpu_clock_perf_counter_read, .hw_perf_counter_read = cpu_clock_perf_counter_read,
}; };
static void task_clock_perf_counter_enable(struct perf_counter *counter)
{
}
static void task_clock_perf_counter_disable(struct perf_counter *counter)
{
}
static void task_clock_perf_counter_read(struct perf_counter *counter)
{
atomic64_counter_set(counter, current->se.sum_exec_runtime);
}
static const struct hw_perf_counter_ops perf_ops_task_clock = {
.hw_perf_counter_enable = task_clock_perf_counter_enable,
.hw_perf_counter_disable = task_clock_perf_counter_disable,
.hw_perf_counter_read = task_clock_perf_counter_read,
};
static const struct hw_perf_counter_ops * static const struct hw_perf_counter_ops *
sw_perf_counter_init(struct perf_counter *counter) sw_perf_counter_init(struct perf_counter *counter)
{ {
...@@ -864,6 +883,9 @@ sw_perf_counter_init(struct perf_counter *counter) ...@@ -864,6 +883,9 @@ sw_perf_counter_init(struct perf_counter *counter)
case PERF_COUNT_CPU_CLOCK: case PERF_COUNT_CPU_CLOCK:
hw_ops = &perf_ops_cpu_clock; hw_ops = &perf_ops_cpu_clock;
break; break;
case PERF_COUNT_TASK_CLOCK:
hw_ops = &perf_ops_task_clock;
break;
default: default:
break; break;
} }
......
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