Ensure that the kernel was compiled with
options LOCK_PROFILING
To start lock profiling
sh# sysctl debug.lock.prof.enable=1
To stop lock profiling
sh# sysctl debug.lock.prof.enable=0
To display the statistics
sh# sysctl debug.lock.prof.stats
To reset the stats
sh# sysctl debug.lock.prof.reset =1
man LOCK_PROFILING for more options and to understand the output of the stats
Remove any compiler optimization flags (-O2 etc) to get the correct file and line numbers in the output
