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perfcounters: fix task clock counter

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Impact: bugfix

Update the task clock counter to the new math.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-12-14 12:22:31 +01:00
parent 9b51f66dcb
commit 8cb391e878
1 changed files with 24 additions and 5 deletions
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29
kernel/perf_counter.c
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@ -850,17 +850,36 @@ 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_update(struct perf_counter *counter)
{ {
} u64 prev, now;
s64 delta;
static void task_clock_perf_counter_disable(struct perf_counter *counter) prev = atomic64_read(&counter->hw.prev_count);
{ now = current->se.sum_exec_runtime;
atomic64_set(&counter->hw.prev_count, now);
delta = now - prev;
if (WARN_ON_ONCE(delta < 0))
delta = 0;
atomic64_add(delta, &counter->count);
} }
static void task_clock_perf_counter_read(struct perf_counter *counter) static void task_clock_perf_counter_read(struct perf_counter *counter)
{ {
atomic64_set(&counter->count, current->se.sum_exec_runtime); task_clock_perf_counter_update(counter);
}
static void task_clock_perf_counter_enable(struct perf_counter *counter)
{
atomic64_set(&counter->hw.prev_count, current->se.sum_exec_runtime);
}
static void task_clock_perf_counter_disable(struct perf_counter *counter)
{
task_clock_perf_counter_update(counter);
} }
static const struct hw_perf_counter_ops perf_ops_task_clock = { static const struct hw_perf_counter_ops perf_ops_task_clock = {