Messages in this thread | | | Date | Wed, 19 Aug 2009 14:56:13 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 4/4][RFC] perf_counter: Allow sharing of output channels |
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* Paul Mackerras <paulus@samba.org> wrote:
> Peter Zijlstra writes: > > > Provide the ability to configure a counter to send its output > > to another (already existing) counter's output stream. > > What sort of thing might this be useful for?
To share the output buffer - say you have a number of tracepoint counters enabled and want a single (coherent) stream of events without a post-processing sorting pass.
Right now each counter has to be opened, mmap-ed separately and then the result stuffed into the output file.
Ingo
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