[PATCH] D25766: [ELF] - Implemented --section-ordering-file option.

George Rimar via llvm-commits llvm-commits at lists.llvm.org
Fri Oct 28 05:51:56 PDT 2016

>George, given that there doesn't seem to be that many uses of this
>format right now, how about just converting this patch to implement
>--symbol-ordering-file? That way we would be able to say that, for
>example, _int_malloc should be at the start of the file.

I probably would vote for implementing both options. As far I saw in firefox scripts
they have option to take list of symbols, and then build a list of sections for
--sections-ordering-file by themselves. Though it is looks never used
for regular linux build.

Today I was able to launch icegrind (https://glandium.org/blog/?p=1008).
It was a bit painfull because it was not committed old patch, so had to
apply it manually for recent code release and was not sure it will work because had to comment checks and so on,
but finally was able to produce a list of sections !

Current my plans for today - use that file to link libxul.so (which is main DSO of
firefox) and measure the amount of page faults with/without ordering for start.

I hope that can prove the idea of such patch and we will able to implement the
--symbol-ordering-file and probably something else like ordering of .text/[hot/startup/*] sections etc.


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