perf_counter: Fix dynamic irq_period logging
We call perf_adjust_freq() from perf_counter_task_tick() which is is called under the rq->lock causing lock recursion. However, it's no longer required to be called under the rq->lock, so remove it from under it. Also, fix up some related comments. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: John Kacur <jkacur@redhat.com> LKML-Reference: <20090523163012.476197912@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -260,6 +260,7 @@ enum perf_event_type {
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/*
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/*
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* struct {
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* struct {
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* struct perf_event_header header;
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* struct perf_event_header header;
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* u64 time;
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* u64 irq_period;
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* u64 irq_period;
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* };
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* };
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*/
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*/
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@ -2559,7 +2559,8 @@ void perf_counter_munmap(unsigned long addr, unsigned long len,
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}
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}
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/*
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/*
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*
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* Log irq_period changes so that analyzing tools can re-normalize the
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* event flow.
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*/
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*/
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static void perf_log_period(struct perf_counter *counter, u64 period)
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static void perf_log_period(struct perf_counter *counter, u64 period)
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@ -4875,9 +4875,10 @@ void scheduler_tick(void)
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update_rq_clock(rq);
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update_rq_clock(rq);
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update_cpu_load(rq);
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update_cpu_load(rq);
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curr->sched_class->task_tick(rq, curr, 0);
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curr->sched_class->task_tick(rq, curr, 0);
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perf_counter_task_tick(curr, cpu);
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spin_unlock(&rq->lock);
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spin_unlock(&rq->lock);
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perf_counter_task_tick(curr, cpu);
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#ifdef CONFIG_SMP
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#ifdef CONFIG_SMP
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rq->idle_at_tick = idle_cpu(cpu);
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rq->idle_at_tick = idle_cpu(cpu);
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trigger_load_balance(rq, cpu);
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trigger_load_balance(rq, cpu);
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