[PATCH] D26130: [ELF] - Implemented --symbol-ordering-file option.

[George Rimar via llvm-commits]

>I just finished a run of firefox.
>
>Unfortunately it is substantially harder to test than clang. What is needed is
>
>* Create a test.html file with window.close() so that we have a
>firefox invocation we can time.

In my experiments I also used this pluging:
https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Measuring_add-on_startup_performance
It seems to work, but no noticable change (for sections list) anyways as I mentioned in previous threads.

>* Subtract the xul load address since perf -D prints raw values.
>* The link with 33k symbols in the order file then takes about 8 minutes.
>
>And after all that there was no significant change in performance.
>Assuming the patch can be cleaned up and optimized I think there is
>enough justification for it.
>
>George, you should probably post your updated icegrind plugin
>somewhere. The two main advantages it should have is not requiring a
>crazy high sampling rate and also ordering data sections.

Updated patch to r16110 of valgrind (latest). It is in attachment.

>Cheers,
>Rafael
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