Messages in this thread | | | Date | Sat, 11 Jan 2014 16:36:14 +0100 | From | Jiri Olsa <> | Subject | Re: [PATCH 1/4] perf, tools: Add support for prepending LBRs to the callstack |
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On Fri, Jan 10, 2014 at 04:32:03AM -0800, Andi Kleen wrote: > From: Andi Kleen <ak@linux.intel.com> > > I never found the default LBR display mode which generates histograms > of individual branches particularly useful. > > This implements an alternative mode that creates histograms over complete > branch traces, instead of individual branches, similar to how normal > callgraphs are handled. This is done by putting it in > front of the normal callgraph and then using the normal callgraph > histogram infrastructure to unify them. > > This way in complex functions we can understand the control flow > that lead to a particular sample. > > The default output is unchanged. > > This is only implemented in perf report, no change to record > or anywhere else. > > This adds the basic code to report: > - add a new "branch" option to the -g option parser to enable this mode > - when the flag is set include the LBR into the callstack in machine.c. > The rest of the history code is unchanged and doesn't know the difference > between LBR entry and normal call entry.
sounds like nice idea, but I could not get the patchset applied on acme's perf/core
jirka
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