* re: function ordering (was: Re: [RFC] exit_thread() speedups in x86
@ 2005-07-04 13:12 Dan Kegel
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From: Dan Kegel @ 2005-07-04 13:12 UTC (permalink / raw)
To: linux-kernel; +Cc: Will Cohen, Brandan C Lennox
Arjan van de Ven wrote:
> hmm. I wonder if a slightly different approach (based on the __slow)
> idea would make sense
> 1) Use -ffunction-sections option from gcc to put each function in it's
> own section
> 2) Use readprofile/oprofile data to collect an (external to the code)
> list of hot/cold functions (we can put a default list in the kernel
> source somewhere and allow people to measure their own if they want)
> 3) Use this list to make a linker script to order the functions
Somebody recently implemented something similar; see
http://www.bclennox.com/ldreorder/
It used valgrind rather than oprofile.
- Dan
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