Messages in this thread | | | Subject | Re: [PATCH 1/7] perf_counter: fix dynamic irq_period logging | From | Peter Zijlstra <> | Date | Mon, 25 May 2009 09:19:52 +0200 |
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On Mon, 2009-05-25 at 10:08 +1000, Paul Mackerras wrote: > Peter Zijlstra writes: > > > We call perf_adjust_freq() from perf_counter_task_tick() which is is called > > under the rq->lock causing lock recursion. > > What was the lock recursion? I see perf_adjust_freq taking ctx->lock, > but we were careful not to take any rq->lock within a ctx->lock, at > least in the past.
perf_output_end() can end up calling a wake_up().
perf_output_end() perf_output_unlock() perf_output_wakeup() perf_counter_wakeup() wake_up_all();
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