Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH 1/2] oprofile: Make callgraph use dump_trace() on i386/x86_64 | Date | Fri, 10 Aug 2007 15:45:22 +0200 |
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On Friday 10 August 2007 15:35:29 jblunck@suse.de wrote: > This patch improves oprofile callgraphs for i386/x86_64. The old backtracing > code was unable to produce even kernel backtraces if the kernel wasn't > compiled with framepointers. The code now uses dump_trace().
Hmm one issue i didn't notice before: with imprecise backtrace the profiling could be a little random because even if the same call chain is hit repeatedly the garbage left over stack entries also reported could vary and then cause oprofile to put it into different buckets. But there is probably not much that can be done about that.
-Andi
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