Messages in this thread | | | Subject | Re: [RFC PATCH 2/5] perf jevents: add support for arch recommended events | From | John Garry <> | Date | Wed, 3 Jan 2018 12:22:16 +0000 |
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On 02/01/2018 17:48, Andi Kleen wrote: >> Can you describe how you autogenerate the JSONs? Do you have some internal >> proprietary HW file format describing events, with files supplied from HW >> designer, which you can just translate into a JSON? Would the files support >> deferencing events to improve scalability? > > For Intel JSON is an official format, which is maintained for each CPU. > It is automatically generated from an internal database > https://download.01.org/perfmon/ > > I have some python scripts to convert these Intel JSONs into the perf > format (which has some additional headers, and is split into > different categories, and add metrics).
OK, understood.
Unfortunately I could not see such a database being maintained for ARM implementors.
> > They have some Intel specifics, so may not be useful for you. > > There's no support for dereference, each CPU gets its own unique file.
Right.
> > But you could do the a merge simply with the attached script which merges > two JSON files.
I assume that you're talking about simply merging the micro architecture and the platform specific event JSONS at build time.
If yes, this would not work for us: - the microarchitecture JSON would contain definitions of all events, but there is no architectural method to check if they are implemented - we need to deal with scenario of non-standard event implementations
But I could update the script to deal with this and add to the build (Jirka looked to be ok with the same in jevents, albeit a few caveats).
All the best, John
> > -Andi >
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