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perf_counter: rework the task clock software counter 

Rework the task clock software counter to use the context time instead
of the task runtime clock, this removes the last such user.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090406094518.445450972@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-04-06 11:45:11 +02:00 committed by Ingo Molnar
parent 4af4998b8a
commit a39d6f2556
1 changed files with 12 additions and 30 deletions
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42
kernel/perf_counter.c
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@ -974,9 +974,6 @@ int perf_counter_task_disable(void)
curr_rq_lock_irq_save(&flags);
cpu = smp_processor_id();
/* force the update of the task clock: */
__task_delta_exec(curr, 1);
perf_counter_task_sched_out(curr, cpu);
spin_lock(&ctx->lock);
@ -1017,9 +1014,6 @@ int perf_counter_task_enable(void)
curr_rq_lock_irq_save(&flags);
cpu = smp_processor_id();
/* force the update of the task clock: */
__task_delta_exec(curr, 1);
perf_counter_task_sched_out(curr, cpu);
spin_lock(&ctx->lock);
@ -2347,38 +2341,28 @@ static const struct hw_perf_counter_ops perf_ops_cpu_clock = {
* Software counter: task time clock
*/
/*
* Called from within the scheduler:
*/
static u64 task_clock_perf_counter_val(struct perf_counter *counter, int update)
static void task_clock_perf_counter_update(struct perf_counter *counter)
{
struct task_struct *curr = counter->task;
u64 delta;
delta = __task_delta_exec(curr, update);
return curr->se.sum_exec_runtime + delta;
}
static void task_clock_perf_counter_update(struct perf_counter *counter, u64 now)
{
u64 prev;
u64 prev, now;
s64 delta;
prev = atomic64_read(&counter->hw.prev_count);
atomic64_set(&counter->hw.prev_count, now);
update_context_time(counter->ctx);
now = counter->ctx->time;
prev = atomic64_xchg(&counter->hw.prev_count, now);
delta = now - prev;
atomic64_add(delta, &counter->count);
}
static int task_clock_perf_counter_enable(struct perf_counter *counter)
{
struct hw_perf_counter *hwc = &counter->hw;
u64 now;
atomic64_set(&hwc->prev_count, task_clock_perf_counter_val(counter, 0));
update_context_time(counter->ctx);
now = counter->ctx->time;
atomic64_set(&hwc->prev_count, now);
hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hwc->hrtimer.function = perf_swcounter_hrtimer;
if (hwc->irq_period) {
@ -2393,14 +2377,12 @@ static int task_clock_perf_counter_enable(struct perf_counter *counter)
static void task_clock_perf_counter_disable(struct perf_counter *counter)
{
hrtimer_cancel(&counter->hw.hrtimer);
task_clock_perf_counter_update(counter,
task_clock_perf_counter_val(counter, 0));
task_clock_perf_counter_update(counter);
}
static void task_clock_perf_counter_read(struct perf_counter *counter)
{
task_clock_perf_counter_update(counter,
task_clock_perf_counter_val(counter, 1));
task_clock_perf_counter_update(counter);
}
static const struct hw_perf_counter_ops perf_ops_task_clock = {