re: function ordering (was: Re: [RFC] exit_thread() speedups in x86

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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

--
Trying to get a job as a c++ developer?  See http://kegel.com/academy/getting-hired.html
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]
  Powered by Linux