Messages in this thread | | | Date | Wed, 11 Oct 2017 18:40:48 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 2/4] perf/ftrace: Fix function trace events |
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On Wed, Oct 11, 2017 at 05:02:28PM +0800, zhouchengming wrote: > On 2017/10/11 15:45, Peter Zijlstra wrote:
> > + if (!(flags& PERF_EF_START)) > > + p_event->hw.state = PERF_HES_STOPPED; > > Don't we need to check the flags for ftrace perf_event? > So if we should put this outside the if (!tp_event->class->reg()) ?
Oh, right you are, that's independent of the hlist nonsense.
> > + list = this_cpu_ptr(pcpu_list); > > + hlist_add_head_rcu(&p_event->hlist_entry, list); > > + } > > Now we don't add perf_event to the pcpu_list, so we also can avoid > to alloc pcpu_list for function tp_event in perf_trace_event_reg().
Yeah that allocation is superfluous, Not entirely sure how to cleanly get rid of that though; that's another web to untangle.
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