Messages in this thread | | | Date | Thu, 16 Aug 2012 23:41:03 +0200 | From | Borislav Petkov <> | Subject | Re: [RFC PATCH -v2 0/4] Persistent events |
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On Thu, Aug 16, 2012 at 05:13:33PM -0400, Steven Rostedt wrote: > BTW, we already have a persistent buffering in the kernel. It's used > by ftrace. What about having perf use that buffering for persistent > events? Or is there some other issues about using it.
Not that I know of.
I coded this with the perf ring buffer now. If only there was one ring buffer in the kernel.. /me ducks and hides.
Ok, with perf I can read out the events programmatically by mmaping the per-CPU buffer with perf_mmap. How do you do that in ftrace? Any code pointers I can stare at?
> I'm currently working on having perf read ftrace data, so in the near > future, I plan on having some RFC patches to have perf reading from > this buffer anyway.
Are you saying the ftrace buffer would be mmappable too now?
Btw, I wanted to hear your opinion on patch 1/4 since it touches ftrace/trace_events code. Can you please look at it and tell me if its ok?
Thanks.
-- Regards/Gruss, Boris.
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