Messages in this thread | | | Date | Thu, 26 Feb 2015 17:44:27 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH V7 1/1] perf tool:perf diff support for different binaries |
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Em Thu, Feb 26, 2015 at 12:34:04PM -0800, Andi Kleen escreveu: > > Having a nice explanation of the problem helps, as my first reaction to > > this patch was: "What? This is what this tool is supposed to do, to > > compare two versions of a binary, one that is being developed from the > > same source, the other with slight modifications, etc", while the > > description of the patch made it look as this was a feature that was now > > being introduced. > > AFAIK it was actually to compare multiple runs of the same binary > with different setups: e.g. varying number of threads. > > However in the Linux kernel development world it turns out comparing > multiple similar binaries is much more useful.
Surely I am getting old and forgetting things, but when I wrote it, my intent was to do:
vi a.c build it perf record a vi a.c # change it build it perf record a perf diff
And see if what I did while vi'ing it matched what I thought it would.
- Arnaldo
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