Re: [RFD 5/5] tracing: Add trace_irqsoff tracepoints

From: Tom Zanussi
Date: Thu Apr 30 2015 - 22:15:21 EST

On Thu, 2015-04-30 at 12:06 +0200, Daniel Wagner wrote:
> Finally we place a few tracepoint at the end of critical section. With
> the hist trigger in place we can generate the plots.
> There are a few drawbacks compared to the latency_hist.patch [1]
> The latency plots contain the values from all CPUs. In theory you
> can also filter with something like
> 'hist:key=latency.bucket:val=hitcount:sort=latency if cpu==0'
> but I haven't got this working. I didn't spend much time figuring out
> why this doesn't work. Even if the above is working you still

I think it doesn't work because the tracepoint doesn't actually have a
'cpu' field to use in the filter...


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