unlikely compiler flag propagation

[Valdis.Kletnieks at vt.edu]

On Wed, 18 Feb 2015 19:38:01 +0100, Nicholas Mc Guire said:
> On Wed, 18 Feb 2015, Greg KH wrote:

> interesting - would you have a reference to some talk/paper/data/... ?

Test for yourself :)

config PROFILE_ANNOTATED_BRANCHES
        bool "Trace likely/unlikely profiler"
        select TRACE_BRANCH_PROFILING
        help
          This tracer profiles all likely and unlikely macros
          in the kernel. It will display the results in:

          /sys/kernel/debug/tracing/trace_stat/branch_annotated

          Note: this will add a significant overhead; only turn this
          on if you need to profile the system's use of these macros.



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