On Wed, 18 Feb 2015, Valdis.Kletnieks@vt.edu wrote:
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.
was not aware of that - many thanks ! I do assume that such a claim of 90% not being effective would not be based on testing some single system but based on a much wider basis so that data would be interesting to see data from different clases of systems. thx! hofrat