perf pmu: Support MetricExpr header in JSON event list
Add support for parsing the MetricExpr header in the JSON event lists and storing them in the alias structure. Used in the next patch. v2: Change DividedBy to MetricExpr v3: Really catch all uses of DividedBy Signed-off-by: NAndi Kleen <ak@linux.intel.com> Acked-by: NJiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20170320201711.14142-10-andi@firstfloor.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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