On Wed, 18 Feb 2015, Valdis.Kletnieks@xxxxxx 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 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
